WASM types

Generated by scripts/gen_wasm_manifest.mjs from the Rust types (via schemars) - do not edit. Run npm run docs:wasm to refresh.

The 419 JSON shapes the WASM exports read and return, alphabetically. Descriptions are the Rust doc comments. A field that is not required may be omitted and takes its default.

AnalysisReport

Used by analysis_report.

Field	Type	Required	Description
maxDisplacements	DisplacementExtreme[]	yes
maxReactions	ReactionExtreme[]	yes
memberUtilisation	MemberUtilSummary[]	yes
passFailRollup	PassFailRollup	yes
stats	ModelStats	yes

Anchor

Field	Type	Required	Description
dia_mm	number	yes
head_dia_mm	number | null		Head (or nut/washer) diameter for the pull-out check; None = pull-out NotDetermined. Default: null.
hef_mm	number | null		Effective embedment. None = not stated = every concrete check NotDetermined. Default: null.
x_mm	number	yes
y_mm	number	yes

AnchorCheckResult

Used by conn_anchor_check.

Field	Type	Required	Description
adequate	boolean | null
bar_dev_length_mm	number | null		AS 3600 development length the claimed bars need, mm (reported; certification is the gate).
bars_accepted	integer[]	yes	Bars the reinforcement gate accepted / rejected, by index into reinforcement.bars.
bars_rejected	[integer, string][]	yes
combinations	CombResult[]	yes
cone_geometry	ConeGeometry | null
factors	PartialFactors	yes
governing	Governing | null		The worst determined utilisation. None while any determined-able check is NotDetermined on the governing side - a verdict with a hole in it is not a verdict (ADR 0003).
notes	string[]	yes

AnchorForce

A solved per-anchor force (e.g. from the CBFEM contact model), N. Overrides the elastic distribution of the combination it belongs to.

Field	Type	Required	Description
shear_n	number	yes
tension_n	number	yes

AnchorForce2

Force per holding-down anchor, recovered from the grounded spring.

Field	Type	Required	Description
anchor	integer	yes	Index into ConnFeaInput::anchors.
bolt	integer	yes	Index into ConnFeaInput::bolts of the shank, so a caller can name it the way the drawing does without holding both lists.
engaged	boolean	yes	Did the final active set have this anchor in tension?
shear	number	yes	Transverse force on the anchor, N. Always present: an anchor in a hole bears on that hole whichever way the plate is going.
tension	number	yes	Axial force, N, positive in TENSION. Exactly zero when the active-set solve found this anchor in compression and dropped it - which is not "no load here", it is "the CONCRETE is carrying it", and the bed's own reaction is where that went.
uplift	number	yes	Uplift at the anchor's rim, m, positive AWAY from the concrete - the stretch the tension is derived from, so a reader can see what the spring was asked to do.

AnchorGroupInput

Used by conn_anchor_check.

Field	Type	Required	Description
anchors	Anchor[]	yes
concrete	Concrete	yes
edges	Edges		Default: {"far_from_all":false,"x_neg":null,"x_pos":null,"y_neg":null,"y_pos":null}.
factors	PartialFactors | null		Default: null.
justification_notes	string[]		Default: [].
loads	Combination[]	yes
per_anchor_forces	AnchorForce[][] | null		Per combination, per anchor, when the joint FEA solved them. Same order as loads. Default: null.
phi_nt_n	number | null		Steel design capacities per anchor, N (AS 4100, phi included). None = steel NotDetermined. Default: null.
phi_vs_n	number | null		Default: null.
post_installed	boolean		Post-installed / chemical anchors are out of scope; a caller that says so gets every concrete check NotDetermined with the reason, never a cast-in number. Default: false.
reinforcement	AnchorReinforcement | null		Default: null.

AnchorReinforcement

Anchor reinforcement claimed to cross the tension cone (ACI 318-19 17.8.2.2). The geometry gate is computed here; development and symmetry are the engineer's certification and are recorded.

Field	Type	Required	Description
bars	Bar[]	yes
cover_mm	number | null		Confining cover to the bar (mm) for the AS 3600 Cl 13.1.2.2 development length report. Default: null.
developed_above	boolean		Default: false.
developed_below	boolean		Default: false.
symmetric	boolean		Default: false.

AngleWorking

The parts of the AS 4100 Cl 8.4.6 single-angle check (SI: N, N.m, m).

Field	Type	Required	Description
cos_alpha	number	yes
e	number	yes	Eccentricity e = ch - t/2 (m) and cos(alpha), alpha between the x and h axes.
equal_legs	boolean	yes
kt	number	yes	Table 7.3.2 kt for the net-section tension check the engineer makes with the real holes.
phi_mbx	number	yes	phi Mbx about the major principal axis (N.m).
phi_nch	number	yes	phi Nch: Cl 6.3 about the rectangular h-axis parallel to the loaded leg, le = l (N).

AutoSizeChange

A single member's final size + governing utilisation, for the change report.

Field	Type	Required	Description
id	integer	yes
num	integer	yes
to	string	yes
toKg	number	yes
util	number | null

AutoSizeReport

Used by auto_size.

Auto-size outcome. Mirrors the JS autoSizeModel return shape (camelCase fields).

Field	Type	Required	Description
changes	AutoSizeChange[]	yes
converged	boolean	yes
iterations	integer	yes
massAfter	number	yes
massBefore	number	yes
none	boolean	yes
solveError	string | null		Why an analysis inside the loop failed, when one did. A failed solve used to end the loop with changed already false, so a mechanism reported converged: true with nothing sized (SA-34).
target	number	yes

Bar

Field	Type	Required	Description
dia_mm	number	yes
fy_mpa	number	yes
x_mm	number	yes
y_mm	number	yes

BeamSupport

One of:

• "simply_supported", "cantilever"
• "continuous_end" - Continuous beam, end span: needs M_s* stated (Cl 8.5.3.1(b) weights midspan and support I_ef).
• "continuous_interior" - Continuous beam, interior span: needs M_s* stated.

BedResult

What the concrete under a bearing plate did.

Field	Type	Required	Description
bed	integer	yes	Index into ConnFeaInput::beds.
contact_fraction	number	yes	Fraction of the plate's area still in contact, 0 to 1. Below 1 the plate has lifted off, and that is the number that says the joint is in the uplift regime rather than the bearing one.
force	number	yes	Total compression the bed delivered, N. With everything else equal this plus the anchor tensions is the joint's axial equilibrium, which is the check a reader can do by eye.
lifted_nodes	integer	yes	Nodes that lifted off, of the plate's total.
plate	integer	yes	Index into ConnFeaInput::plates of the plate that bears.
pressure_max	number	yes	Peak contact pressure, Pa. Compare against 0.85 f'c phi and the confinement factor in the COMPONENT check - nothing here knows the concrete's strength.
total_nodes	integer	yes

BoltForce

Force per bolt, recovered from the connector. Elastic, and with no strength behind it.

Field	Type	Required	Description
bolt	integer	yes	Index into ConnFeaInput::bolts.
plies	integer	yes	How many plies the bolt connects. 2 = single shear, 3 = double shear.
shear	number	yes	The largest transverse force on any one SHEAR PLANE, N - which is the quantity a bolt shear check is written against. A ply in double shear hands over twice this in total.
tension	number	yes	Axial force in the shank, N, positive in TENSION. With no contact modelled a negative value means the plies are being pushed together, which a real joint carries by bearing on each other and not through the bolt - so a compressive value here is an artefact of the missing contact, not a bolt force.

BoltHole

Where one bolt meets one plate: the ring of mesh nodes around its hole. This is the connector's attachment. It exists in the MESH rather than being re-derived in the solve because the rim is a property of how the plate was meshed - the mesher splits rim segments during refinement, so the ring is not the ring that was handed in, and geometry is the only thing that survives a remesh.

Field	Type	Required	Description
bolt	integer	yes	Index into ConnFeaInput::bolts.
edge_dist	number	yes	Distance from the hole centre to the nearest plate boundary, m - EN 1993-1-8's e_b.
offset	number	yes	Signed distance of this plate's mid-surface from the bolt's pos, along the bolt axis, m. Its SIGN is what tells tension from compression at this ply.
pitch	number | null		Centre-to-centre distance to the nearest other hole in the SAME plate, m - p_b. None when this is the only hole in the plate.
plate	integer	yes	Index into ConnFeaMesh::plates.
radius	number	yes	Hole radius, m.
rim_nodes	integer[]	yes	Mesh node indices on the hole rim, global numbering.
rim_weights	number[]	yes	Tributary weight of each rim node, by rim arc. Sums to 1, so the coupling below is independent of how finely the rim happens to be meshed.

BuildingSlendernessReport

Used by building_slenderness_check.

Result of a building slenderness check.

Field	Type	Required	Description
building_height_m	number	yes
direction	string	yes	Direction that was checked: "x", "y", or "xy" (resultant).
governing_load_case_id	integer	yes
governing_node_id	integer	yes
limit_ratio	number	yes
max_displacement_m	number	yes
pass	boolean	yes
slenderness_ratio	number | null		The slenderness ratio, or None when there was NO lateral displacement at all - in which case there is no ratio to report rather than an infinite one. THIS USED TO BE f64::INFINITY, and JSON has no infinity: serde writes it as null, so the field arrived as null and the UI's truthiness guard skipped the whole line. A building that did not sway showed NOTHING - not "passes", not "no displacement", nothing - while the check had in fact passed. Making it Option says the same thing in the type and gives the panel something explicit to render.

Check

Field	Type	Required	Description
action_n	number | null
clause	string	yes
note	string | null
resistance_n	number | null		Design resistance (N) and design action (N) behind the utilisation, when determined.
state	CheckState	yes
util	number | null

CheckState

Whether a code check passed, failed, or could not be determined (and therefore must NEVER be counted as a pass). Shared across the concrete-design modules (pedestal, pile cap, ...) so the three-state honesty convention is a single type they all use rather than a per-module duplicate.

One of: "Ok", "NotAdequate", "NotDetermined"

Coarsen

See FePlate::coarsen. from is in the plate's own 2D frame.

Field	Type	Required	Description
from	number[][]	yes
h_far	number	yes
rate	number	yes

CodeRef

A structured reference to a governing code provision. The reference is part of the calculation, not an annotation: standard name + edition/year + clause travel WITH the value. Recording the year makes historical calcs traceable when a standard is later revised (a 2020 result stays a 2020 result).

Field	Type	Required	Description
clause	string	yes	Clause / section / table, e.g. "Cl 5.2.1" or "Table 6.3.3(1)".
standard	string	yes	e.g. "AS 4100". A single step may cite a DIFFERENT standard than the derivation's headline code (e.g. a load term from AS/NZS 1170 inside an AS 4100 check) - so the basis of design is exact.
year	string	yes	Edition/year, e.g. "2020" (or "2020 Amdt 1"). Empty only for non-coded arithmetic.

ColdFormedCombined

Used by as4600_combined.

AS/NZS 4600 cold-formed combined actions (Cl 3.5 linear interaction) for one load case.

Field	Type	Required	Description
axial_util	number	yes	Axial utilisation: |Ncomp| / min(φNcx, φNcy), or |Ntens| / φNt in tension
util_max	number	yes	Cl 3.5 linear interaction sum = axial_util + util_mx + util_my
util_mx	number	yes	Major-axis bending utilisation M*x / φMbx
util_my	number	yes	Minor-axis bending utilisation M*y / φMby

ColumnLoad

One column reaction applied to the raft, spread over its footprint as a linearly varying pressure. All SI: N, m, N.m.

Field	Type	Required	Description
bx	number	yes
by	number	yes
cx	number	yes
cy	number	yes
mx	number	yes
my	number	yes
n	number	yes
pedestal_bx	number		Optional PEDESTAL (column head / local thickening) plan size at this column, m. When larger than bx/by this becomes the "effective area of a support" of AS 3600 Cl 9.3.1.1 - "the area totally enclosing the actual support... for which the perimeter is a minimum" - so the punching critical perimeter is built from it instead of the bare column. Zero or smaller than the column means no pedestal. This is the cheapest real remedy for a punching overstress on a raft, and it is deliberately PUNCHING-ONLY: it does not thicken the plate in the FE, so the pressure field and the bending moments are unchanged. That is honest for a pedestal whose depth is small against the mat span (its job is to spread the column load, not to stiffen the raft), and it is why raft_design reports the pedestal alongside the check rather than silently folding it in. A genuine DROP PANEL deep enough to change the raft's stiffness needs a per-element thickness in the FE, which this does not attempt. Default: 0.
pedestal_by	number		Default: 0.

Combination

One FACTORED (ULS) combination at the plate. Sign: n_n positive = tension on the group.

Field	Type	Required	Description
mx_nmm	number		Moments about the plate's x and y axes, N.mm. Distributed to anchors elastically. Default: 0.
my_nmm	number		Default: 0.
n_n	number		Default: 0.
name	string	yes
seismic	boolean		Default: false.
vx_n	number		Default: 0.
vy_n	number		Default: 0.

CombResult

Field	Type	Required	Description
anchor_shear_n	number[]	yes
anchor_tension_n	number[]	yes	Per-anchor tension (N, +ve) and shear (N) this combination was checked with.
blowout	Check	yes
combined_concrete	Check	yes
combined_steel	Check	yes
name	string	yes
pryout	Check	yes
rebar_credited	boolean	yes	True when the tension cone row is the reinforcement tie, not the concrete cone.
seismic	boolean	yes
seismic_qualification	Check	yes
shear_edge	Check	yes
shear_steel	Check	yes
splitting	Check	yes
tension_cone	Check	yes
tension_pullout	Check	yes
tension_steel	Check	yes

Concrete

Field	Type	Required	Description
cracked	boolean		Cracked is the default and the conservative one (k1 = 7.7 vs 11.0). Uncracked needs a justification note or the tension checks come back NotDetermined. Default: true.
fck_mpa	number	yes
thickness_mm	number	yes

ConeGeometry

Field	Type	Required	Description
ac_n0_mm2	number	yes
ac_n_mm2	number	yes
hef_mm	number	yes
k1	number	yes
n_rk_c0_n	number	yes
psi_ec_n	number	yes
psi_re_n	number	yes
psi_s_n	number	yes

Connection

One derived connection at a shared node.

Field	Type	Required	Description
boltCount	integer	yes	Estimated bolt count.
coatingArea_m2	number	yes	Paintable / galvanisable surface area contributed by this joint (m²).
connectionType	string	yes	Inferred connection type.
cutCount	integer	yes	Estimated cut / prep operations.
holeCount	integer	yes	Estimated hole count (drilled / punched holes).
members	integer[]	yes	Member ids whose ends meet at this node.
node_id	integer	yes
weldLength_m	number	yes	Estimated fillet weld length (m) for the joint.

ConnectionConfig

Connection batch check/design configuration (from @FD) and connection design preferences (from @JS). Both sections are optional; a job with no connection data yields None.

Field	Type	Required	Description
batch_check_design_check	boolean		Default: false.
batch_check_design_connection_string	string | null		Default: null.
batch_check_design_design	boolean		Default: false.
batch_check_design_load_case_string	string | null		Default: null.
batch_check_design_use_minimum_design_actions	boolean		Default: false.
beam_end_clearance	number | null		Default: null.
bolt_category	integer | null		0 = commercial, 1 = structural Default: null.
bolt_gauge	number | null		Default: null.
bolt_pitch	number | null		Default: null.
bolt_strength	integer | null		0 = normal (4.6), 1 = high (8.8) Default: null.
bolt_threads	integer | null		0 = excluded, 1 = intercepted Default: null.
cleat_strength	integer | null		Default: null.
connection_dxf_layer_bolts_name	string | null		Default: null.
connection_dxf_layer_centerlines_name	string | null		Default: null.
connection_dxf_layer_cut_offs_name	string | null		Default: null.
connection_dxf_layer_dimensions_name	string | null		Default: null.
connection_dxf_layer_footings_name	string | null		Default: null.
connection_dxf_layer_geometry_name	string | null		Default: null.
connection_dxf_layer_hidden_lines_name	string | null		Default: null.
connection_dxf_layer_plates_name	string | null		Default: null.
connection_dxf_layer_text_name	string | null		Default: null.
coped_flange_clearance	number | null		Default: null.
coping_radii	number | null		Default: null.
edge_distance	number | null		Edge distance multiplier x bolt diameter. Default: null.
flange_weld_type	integer | null		0 = fillet, 1 = CJP Default: null.
member_strength	integer | null		Default: null.
minimum_cope_distance	number | null		Default: null.
moment_bolt_procedure	integer | null		Default: null.
plate_strength	integer | null		0 = normal, 1 = high Default: null.
plate_thick_max	number | null		Default: null.
plate_thick_min	number | null		Default: null.
report_connection_calculations	boolean		Default: false.
report_connection_detailed_output	boolean		Default: false.
report_connection_input_data	boolean		Default: false.
report_connection_result_summary	boolean		Default: false.
report_connection_specifications	boolean		Default: false.
report_connection_string	string | null		Default: null.
report_connection_warnings_and_notes	boolean		Default: false.
report_pass_fail_criteria	string | null		Default: null.
simple_bolt_procedure	integer | null		Default: null.
snug_bolt_max	number | null		Default: null.
snug_bolt_min	number | null		Default: null.
stiffener_weld_category	integer | null		Default: null.
tens_bolt_max	number | null		Default: null.
tens_bolt_min	number | null		Default: null.
weld_category	integer | null		0 = GP, 1 = structural purpose Default: null.
weld_max	number | null		Default: null.
weld_min	number | null		Default: null.
weld_strength	integer | null		0 = normal, 1 = high Default: null.

ConnectionTakeoff

Used by connection_takeoff.

Complete connection take-off report.

Field	Type	Required	Description
connections	Connection[]	yes
totals	ConnectionTotals	yes

ConnectionTotals

Grand totals across all connections.

Field	Type	Required	Description
boltCount	integer	yes
coatingArea_m2	number	yes
cutCount	integer	yes
holeCount	integer	yes
weldLength_m	number	yes

ConnFeaInput

Used by conn_fea_mesh, conn_fea_solve.

One meshing (and, with supports/loads, one solving) run over a whole joint.

Field	Type	Required	Description
anchors	FeAnchor[]		Holding-down anchors: bolts that grip the concrete rather than a second ply. Ignored by conn_fea_mesh - an anchor's HOLE is cut by its bolt like any other. Default: [].
beds	FeBed[]		Elastic beds under bearing plates. Ignored by conn_fea_mesh. Default: [].
bolts	FeBolt[]		Default: [].
loads	FeLoad[]		What is applied. Ignored by conn_fea_mesh. Default: [].
plates	FePlate[]	yes
rotation_probes	FeRotationProbe[]		Cross-sections to report a rotation at, for a joint stiffness. Empty by default and free when empty: the fit runs after the solve, over nodes already computed. Default: [].
sizing	SizingField	yes	The mesher's own sizing field, passed through to mesh_polygon per plate. Hole rims add their own refinement on top of whatever arrives here (see plate_sizing).
supports	FeSupport[]		Where the joint is held. Ignored by conn_fea_mesh; conn_fea_solve refuses without at least one, because an unrestrained shell assembly has six rigid-body modes and a solve that "completes" on one is meaningless. Default: [].
welds	FeWeld[]		Welds tying plate edges to other plates. Ignored by conn_fea_mesh - the mesh is of the plates, and a tie changes nothing about their geometry. Default: [].

ConnFeaMesh

Used by conn_fea_mesh.

The joint mesh: plate meshes mapped into 3D, one node block per plate, NOT welded together.

Field	Type	Required	Description
bolt_holes	BoltHole[]		One entry per (bolt, plate) pair where a hole was actually CUT. A bolt with fewer than two of these connects nothing. Default: [].
boundary_nodes	integer[]	yes	Node indices on a plate boundary (outer edge or hole rim), global numbering. Step 2 needs these to find weld lines and hole rims without re-deriving the topology.
nodes	number[][]	yes
plate_of_tri	integer[]	yes	For each triangle, the index into ConnFeaMesh::plates it belongs to.
plates	PlateMeshInfo[]	yes
tris	integer[][]	yes
warnings	string[]	yes	Everything that was refused, skipped or clamped, in the words of the reason. Never empty silently: if a hole did not get cut, it says so here.

ConnFeaResult

Used by conn_fea_solve.

Per-node results, aligned to ConnFeaMesh::nodes.

Field	Type	Required	Description
anchor_forces	AnchorForce2[]		One entry per holding-down anchor. The number a base plate exists to produce. Default: [].
applied_force	number[]	yes	Applied force resultant, N, and the reaction the supports returned - which must equal it.
applied_moment	number[]	yes	The same for MOMENT about the origin, N.m. Reported for the same reason the forces are: a member can carry pure moment, and then the force resultants are both zero and say nothing.
beds	BedResult[]		One entry per elastic bed that had any spring under it: how much the concrete carried, at what peak pressure, and over how much of the plate it was still in contact. Default: [].
bolt_forces	BoltForce[]		One entry per bolt that actually connects two or more plies. Elastic, from a linear connector with no pretension, no contact and no slip - see BoltForce. Default: [].
contact_passes	integer | null		How many active-set passes the bearing/anchor state took to settle. 0 when there was no contact to resolve; None when it did not settle - see the warning that says so. Default: null.
converged	boolean	yes	True only when the solver returned, the solution is finite, and equilibrium closes.
elastic_stress_ratio	number | null		sigma_vm_max / fy over the plates that stated an fy. None when none did. This is an ELASTIC stress ratio, NOT a code utilisation and NOT the 5% plastic strain criterion.
equilibrium_error	number	yes	|applied + reaction| / |applied|. Zero for a correct solve; reported rather than only asserted, because it is the one number that catches load applied where nobody meant it.
mesh	ConnFeaMesh	yes
reaction_force	number[]	yes
reaction_moment	number[]	yes
rotations	ProbeRotation[]		One entry per rotation probe, in the order they were given. Default: [].
sigma_vm	number[]	yes	Elastic von Mises stress at each node, Pa: the worse of the two plate SURFACES (membrane plus and minus the bending part), area-averaged from the elements meeting at that node.
sigma_vm_max	number	yes
sigma_vm_max_joint	number	yes	The same peak, taken over the JOINT ONLY - every node inside a load or support region, grown by INTRO_MARGIN, is left out. A member's N/V/M are delivered as a force field over one end face, and a force field over a face is not how the member is really loaded: the face sees a local disturbance that dies away within about a section depth, which is St Venant's principle and is the whole reason the stub exists. Measured on a 360UB stub carrying 180 kN.m, the cut face itself reaches 441 MPa - 1.47 times fy - while the joint 250 mm away is a separate and much larger concentration. Both are red on a plot clipped at yield, and only one of them is a result. Reporting the global maximum as "the peak" reports whichever of the two happens to be higher. Equal to sigma_vm_max when nothing was excluded.
u	number[][]	yes	Translation at each node, m, global axes.
u_max	number	yes	Largest nodal translation magnitude, m.
warnings	string[]	yes

ConsequencesClass

Table A1 consequences classes. Class 2 is split into its Lower and Upper risk groups (the published standard's 2a and 2b).

One of: "Class1", "Class2Lower", "Class2Upper", "Class3"

ConsolState

Which branch of the e-log(sigma') curve the consolidation settlement used, or why it was skipped.

One of:

• "NormallyConsolidated" - Normally consolidated: the whole stress increase rides the virgin compression line (Cc).
• "OverconsolidatedRecompression" - Overconsolidated and the final stress stays below preconsolidation: recompression only (Cr).
• "OverconsolidatedCrossing" - Overconsolidated but the stress increase crosses preconsolidation: Cr then Cc.
• "NotComputed" - No compressible layer / missing parameters: consolidation was not computed (not zero).

Construction

One of: "Framed", "LoadBearingWall"

CraneResult

Used by en1991_3_crane.

Field	Type	Required	Description
axle_spacings_m	number[]	yes
axle_weights_kn	number[]	yes	The axle train for the runway beam: the group 1 wheel loads on rail 1 at the wheel spacings.
buffer_h_b1_kn	number	yes	Buffer forces (kN): H_B,1 from the crane's kinetic energy, H_B,2 from the crab.
buffer_h_b2_kn	number	yes
drive_force_kn	number	yes	Drive force K (kN), the lever l_s (m), the moment M (kNm).
drive_moment_knm	number	yes
fatigue_q_e_normal_kn	number | null		Fatigue damage-equivalent wheel loads (kN per wheel), normal and shear, if a class was given.
fatigue_q_e_shear_kn	number | null
groups	LoadGroup[]	yes
l_s_m	number	yes
phi_1	number[]	yes
phi_2	number	yes
phi_4	number	yes
phi_5	number	yes
phi_7	number	yes
q_r_max_acc_static	number	yes
q_r_max_kn	number	yes	The characteristic maximum wheel load (group 1, phi_1 = 1.1 and phi_2), kN per wheel.
q_r_max_static	number	yes	Static wheel loads (no dynamic factor), kN per wheel: loaded crane near rail (Q_r,max), loaded far rail (Q_r,(max)), unloaded near rail (Q_r,min), unloaded far rail (Q_r,(min)).
q_r_min_acc_static	number	yes
q_r_min_kn	number	yes	The characteristic minimum wheel load (unloaded crane, phi_1 = 0.9), kN per wheel.
q_r_min_static	number	yes
skew_f	number	yes	Skewing: f, S (kN), and the transverse wheel forces per wheel pair on rails 1 and 2 (kN).
skew_h_t_rail1_kn	number[]	yes
skew_h_t_rail2_kn	number[]	yes
skew_s_kn	number	yes
standard	string	yes
steps	Step[]	yes
verified	boolean	yes
warnings	string[]	yes
xi_1	number	yes

Derivation

Used by as4100_phi_mbx_derivation, as4100_phi_ms_derivation, as4100_phi_nc_derivation.

A complete derivation for one check: the givens, the working, and the headline result.

Field	Type	Required	Description
code	string	yes	Governing standard name, e.g. "AS 4100".
edition	string	yes	Edition/year of that standard as IMPLEMENTED by the solver - recorded so a historical calc stays traceable to the rules it was run under, even after the standard is revised.
inputs	Input[]	yes
result	Step	yes	The headline line (capacity or utilisation) - carries the pass/fail.
steps	Step[]	yes
title	string	yes

DesignSection

WHERE THE BENDING CHECK'S CRITICAL SECTION SITS - AS 3600:2018 Cl 20.4.2. The clause names three, and they are not interchangeable: they differ by how much of the support is assumed to spread the load before the cantilever starts, and the difference goes straight into the design moment. (a) the face of the column, pedestal or wall for concrete members; (b) halfway between the centre and face of the wall for a masonry wall; (c) halfway between the face of the column and the edge of the base plate for a steel column and base plate. (a) IS THE DEFAULT and is what this module has always done, so no existing result moves. (b) is more conservative than the face - a masonry wall cannot be relied on to spread the load to its own face - and (c) is less, because a base plate does spread it. A NOTE ON WHERE THE CLAUSE LIVES. Section 20 is "Plain concrete pedestals and footings", and this is the only place AS 3600 states the rule explicitly; it is the convention applied to reinforced pads as well. That is said out loud rather than implied, because a reader checking the citation will find it in the plain-concrete section and should not have to wonder whether it was misread. Cl 6.2.3's "0.7 times the length of a support from the centre-line" is a DIFFERENT rule for a different thing - the critical section for negative moments in a continuous flexural member - and is deliberately not offered here.

One of:

• kind: "face" - (a) At the face of the column. The default, and what every result before 2026-09-09 used.

• kind: "masonry_wall" - (b) Halfway between the centre of the wall and its face - a masonry wall.

• kind: "steel_base_plate" - (c) Halfway between the column face and the edge of the base plate, for a steel column. plate_b is the base plate's dimension in the direction being checked, in metres; a plate no larger than the column collapses to the face, which is the honest answer for one.

  Field	Type	Required	Description
  kind	"steel_base_plate"	yes
  plate_bx	number	yes
  plate_by	number	yes

DisplacementExtreme

Field	Type	Required	Description
component	string	yes
load_case_id	integer	yes
node_id	integer	yes
value	number	yes

DistributionRule

The vertical distribution rule, by standard.

One of:

• "as1170_4" - AS 1170.4:2024 Cl 6.3: the whole shear split by w h^k, k interpolating with the period.
• "nzs1170_5" - NZS 1170.5:2004 Cl 6.2.1.3: a flat Ft = 0.08 V lumped at the TOP level, and the remaining 0.92 V split by w h - no period-dependent exponent at all. The difference is not a refinement of the same shape. Under AS the top level's share is whatever w h^k gives it; under NZS it is that share of 0.92 V PLUS a fixed 8% of the whole shear. Both rules sum to V, so a total-equals-V check cannot tell them apart - which is exactly how the wrong one gets shipped unnoticed.

DominantOpening

Where the dominant opening is, if there is one. ratio is its area over the total open area of the other walls and roof (Table 5.1(B)). wall: "none", "x0" / "xb" (the long side walls at x = 0 and x = span), "y0" / "yl" (the end walls at y = 0 and y = length). at_m is its centre, measured along that wall from its start (x for an end wall, y for a side wall); negative = the wall's middle.

Field	Type	Required	Description
at_m	number		Default: -1.
ratio	number		Default: 0.
wall	string		Default: "none".

DoubleAngleConnectors

The interconnectors of a double-angle member (SA-156): AS 4100 Cl 6.5 designs two angles back to back as one member only with their connector spacing, and the gap between the backs (a packer or the gusset they straddle; 0 = in contact) sets the pair's inertia about its axis of symmetry. Absent for a member = not given: the check refuses it and says what to enter.

Field	Type	Required	Description
gap_mm	number		Default: 0.
member_id	integer	yes
spacing_mm	number	yes

DsmCapacity

DSM member capacity result. Loads in N, moments in N*mm.

Field	Type	Required	Description
dist_b	DsmMode	yes
dist_c	DsmMode	yes
elastic_source	string		Where the local and distortional elastic buckling came from: "finite_strip" (the section's finite strip, SA-73) or "element_method" (the plate/rotational-spring fallback). Default: "".
global_b	DsmMode	yes
global_c	DsmMode	yes
gov_b	string	yes
gov_by	string		Default: "".
gov_c	string	yes
local_b	DsmMode	yes
local_by	DsmMode		Default: {"cap":0,"ncr":0}.
local_c	DsmMode	yes
my	number	yes
my_y	number		Minor-axis bending: first-yield My_y (Zfy*fy) and the minor local-buckling result Mbl_y. Minor-axis bending has no lateral-torsional mode (Mbe_y = My_y) and distortional is not critical, so the governing minor capacity is min(My_y, Mbl_y). Default: 0.
ny	number	yes
phi_mb	number	yes
phi_mby	number		Default: 0.
phi_nc	number	yes
phi_rb	number		Web-crippling capacity phi*Rb (N), end-one-flange, 50 mm bearing (indicative default). Default: 0.

DsmMode

One DSM limit-state result (a buckling mode -> a capacity).

Field	Type	Required	Description
cap	number	yes	Nominal capacity from the DSM strength curve (N or N*mm).
ncr	number	yes	Elastic buckling load/moment for this mode (N or N*mm).

Edges

Distances from the anchor GROUP's outermost anchor to the concrete free edges, mm, in plate coordinates: x_neg is the edge in the -x direction, etc. None = far from that edge.

Field	Type	Required	Description
far_from_all	boolean		An UNSTATED edge is not a far edge. A group in the middle of a large slab says so here, and then any None above means "farther than c_cr,N". Without it, a missing distance makes the concrete checks NotDetermined - "far" was the silent default and it is the unconservative one. Default: false.
x_neg	number | null		Default: null.
x_pos	number | null		Default: null.
y_neg	number | null		Default: null.
y_pos	number | null		Default: null.

EquivalentRigidities

Rigidities given directly, in MATERIAL axes: for decking, ribbed and hollowcore slabs, or CLT from its layup, where no single homogeneous material describes the plate. A and S in N/m, D in N m, engineering shear strain and twist.

Field	Type	Required	Description
a11	number	yes
a12	number	yes
a22	number	yes
a66	number	yes
d11	number	yes
d12	number	yes
d22	number	yes
d66	number	yes
s13	number	yes
s23	number	yes

FeAnchor

A HOLDING-DOWN ANCHOR: a bolt that grips the concrete instead of a second ply, modelled as a grounded spring that can PULL and cannot PUSH. # Why this exists A base plate's anchors are declared as bolts, and a bolt in this module connects the plies it pierces. An anchor pierces exactly one - the base plate - and the concrete below is not a plate, so before this an anchor was a HOLE THAT CONNECTED NOTHING. The joint was instead held by a support box: the plate pinned rigidly in a small box around each anchor and held vertically over its whole area. That model gives plate bending and says nothing at all about the anchors, because a rigid restraint has no force to report and infinite stiffness to contribute. A base-plate joint FEA was a picture of a plate with the one question a base plate exists to answer left out. # What it is A spring from the anchor's hole rim - the same tributary-weighted rim mean the bolt connector uses, so it is independent of how finely that rim happened to mesh - to ground. Three components: - AXIAL, along axis, TENSION ONLY. E A / L_eff, where L_eff is the anchor's stretching length: the free length between the plate and the point in the concrete where the anchor is actually gripped, not the embedment. An anchor is engaged only when the plate lifts off it; pushing on an anchor is what the CONCRETE does, and that is FeBed below. - SHEAR, perpendicular to axis, always active. Always, because an anchor in a hole bears on that hole whichever way the plate is moving. # What it is not No pretension, no slip, no cone breakout, no bond. The spring says how the plate and the anchors SHARE the uplift, not whether an anchor or the concrete around it is strong enough - that is the component check's question and it stays there.

Field	Type	Required	Description
area	number	yes	Tensile stress area, m^2.
bolt	integer	yes	Index into ConnFeaInput::bolts of the shank this anchor is. The hole is cut by that bolt as usual; this adds the ground connection the bolt cannot make for itself.
e	number	yes	Young's modulus of the anchor, Pa.
free_len	number	yes	Stretching length, m - plate underside to the effective grip point in the concrete. NOT the embedment: a cast-in anchor with a plate washer is gripped at the washer, a chemical anchor is gripped over its bond length and stretches over roughly half of it.
into	number[]	yes	Direction from the plate INTO the concrete, global. Need not be unit. This is what makes the tension-only test a statement about the joint and not about which way a caller happened to point the bolt axis: the anchor is in TENSION when the rim moves opposite to it.
k_shear	number | null		Shear stiffness of one anchor, N/m. None derives it from the shank in double curvature over the standoff - see anchor_shear_stiffness. Default: null.
standoff	number | null		Standoff, m: the gap between the plate's underside and the concrete face that the anchor bends over in shear - grout, a levelling nut, or nothing. None uses the plate half-thickness, which is the grouted-tight case. Default: null.

FeBed

The CONCRETE under a bearing plate: an elastic bed that can PUSH and cannot PULL. # Why this exists The base plate used to be held vertically over its whole area by a rigid support box. Two things follow from that and both are wrong in the same direction. The plate cannot LIFT OFF, so an uplift case is carried by a restraint a real base does not have - and every newton the bed carries in tension is a newton the ANCHORS do not, so anchor tension comes out too low, which is the unconservative direction on the one number the joint is designed for. And a rigid bed puts the whole bearing reaction into a knife edge under the column, so the plate's own bending is wrong too. # What it is A Winkler bed: an independent spring at every node of the plate, along into, of stiffness k * A_i where A_i is that node's tributary area, so refining the mesh does not change the answer. Compression only - a node that lifts drops out and the bed under it carries nothing. # Choosing k A subgrade modulus in Pa/m. For a base plate on a concrete pedestal the usual reading is k ~ E_c / h, with h the depth of concrete that participates - about the plate's own half-width for a plate on a large block. This module does not choose it: a stiffness nobody chose is exactly what the rigid box was. The caller states it and the result reports what it did. The bed's job here is the DISTRIBUTION, not the magnitude. Bearing stress against 0.85 f'c and the confinement factor remain the component check's - this cannot say whether the concrete is strong enough, only where the plate presses on it and how much is left for the anchors.

Field	Type	Required	Description
into	number[]	yes	Direction from the plate INTO the concrete, global. Need not be unit.
k	number	yes	Subgrade modulus, Pa/m (N/m per m^2 of plate).
plate	integer	yes	Index into ConnFeaInput::plates of the plate that bears.

FeBolt

A bolt shank: where a hole is cut, and - since spec step 4 part 3 - a LINEAR connector that carries shear and tension between the plies it passes through. See bolt_connector_stiffness for what that connector is and, more importantly, what it is not: there is no pretension, no contact, no slip and no bearing nonlinearity, so a bolted joint modelled with these cannot open and cannot pry. Those are spec steps 6 and 7.

Field	Type	Required	Description
area	number | null		Effective shank area, m^2. None uses the plain shank pi d^2 / 4. A bolt threaded through the shear plane carries about 0.78 of that, and a caller that knows which it is should say so here rather than shrink dia - dia also sizes the HOLE. Default: null.
axis	number[]	yes	Shank direction, global. Need not be unit.
dia	number	yes	Shank (bolt) diameter, m.
e	number | null		Young's modulus of the bolt, Pa. Required before the bolt is allowed to CONNECT anything - conn_fea_solve refuses a bolt that pierces two plies without one, for the same reason it refuses a plate without one. A bolt that pierces a single ply is only a hole and needs nothing. Default: null.
hole	number | null		Hole diameter override, m. None uses the AS 4100 Cl 14.3.2 standard clearance hole via crate::fasteners::hole_diameter. Default: null.
k_shear	number | null		Shear stiffness override for the connector, N/m, stated for a SINGLE-SHEAR pair (the stiffness between the two plies). None derives it - see bolt_connector_stiffness. Default: null.
k_tension	number | null		Tension stiffness override for the connector, N/m, stated the same way. Default: null.
len	number	yes	Gripped length of the shank, m. A plate is only pierced if its mid-surface falls within len/2 of pos along the axis - which is what stops a bolt in one part of the joint from punching a hole through a parallel plate somewhere else.
pos	number[]	yes	Centre of the shank, global.

FeLoad

A load RESULTANT applied over a region, spread across the mesh nodes inside it. The spread is by nodal tributary area, so refining the mesh does not change the answer, and the moment is delivered as a force field about the region's own area-weighted centroid - which makes its net force exactly zero by construction rather than approximately zero by symmetry. (That distinction was a real bug on the raft: a moment applied about the wrong point injected phantom vertical load. See footing_fe's column-load note.)

Field	Type	Required	Description
at	number[] | null		The point the resultant acts THROUGH. None uses the region's weighted centroid, which is what a pressure-like load wants. A member's N/V/M are stated about its own axis, and that is not the same point: the weighted centroid is a property of the MESH, and an unstructured mesh over a symmetric section does not put it exactly on the axis. Measured on a 360UB stub, the offset was around 0.7 mm - which sounds like nothing until it acts on 400 kN about a weak axis 15x softer than the strong one, where it moved the free end 0.8 mm sideways under a "pure" axial load, and moved differently on every mesh. Naming the point removes the mesh from the answer. Default: null.
axis	number[] | null		The region is additionally a SLAB: nodes within slab of the plane through at normal to axis. A member end is a face normal to the member, and a pitched member's face is not normal to any world axis - the box alone, made thin to catch a face, caught a line of it (one node, on the shipped portal's rafters, 2026-09-03) and the moment could not be applied. With the plane named, the box only has to be big enough and the slab does the selecting. Default: null.
force	number[]		Force resultant, N, global axes. Default: [0,0,0].
max	number[]	yes
min	number[]	yes
moment	number[]		Moment resultant, N.m, global axes, about at when given and about the region's own weighted centroid otherwise. Default: [0,0,0].
slab	number | null		Default: null.

FePlate

A flat plate in the joint: a polygon in its own 2D frame, placed in 3D. origin/ex/ey place the plate's mid-surface: a local point (x, y) maps to origin + x*ex + y*ey, and the plate normal is ex x ey. ex and ey need not arrive unit or exactly orthogonal - Placement::from_axes orthonormalises them and refuses a degenerate pair.

Field	Type	Required	Description
coarsen	Coarsen | null		GRADED sizing for a plate that is context rather than subject - a member stub: the caller's target size at the from points (the cut face at the joint), growing at rate per metre of distance to h_far. A stub meshed uniformly at the joint's size was two thirds of the element count of an eaves joint and none of its answer (2026-09-03). None = uniform. Default: null.
e	number | null		Young's modulus, Pa. None is carried through untouched by the mesher; conn_fea_solve REFUSES a plate without it rather than assuming a steel value, because a modulus quietly filled in is a stiffness nobody chose. Default: null.
ex	number[]	yes	Local +x direction in global coordinates.
ey	number[]	yes	Local +y direction in global coordinates.
fu	number | null		Tensile strength, Pa. Used ONLY by the bolt connector, for EN 1993-1-8 Table 6.11's bearing stiffness k_12, which is a function of the ply's f_u. None means that component is left out and the connector carries the shank's own flexibility alone - which is stiffer, and is said out loud in a warning rather than left to be discovered. Default: null.
fy	number | null		Yield stress, Pa. None is carried through untouched - see the module note on why this is not defaulted. Default: null.
id	string	yes	Label carried through to the mesh so the viewer can name a part. Not interpreted.
nu	number | null		Poisson's ratio. None uses 0.3. Unlike e and fy this is defaulted deliberately: for structural steel 0.3 is a material constant, not a design decision, and there is no plausible input for which a caller meant something else and forgot to say so. It is a field rather than a buried constant so that the value is visible in the input a caller can print. Default: null.
origin	number[]	yes	Global position of the plate's local origin, on the MID-SURFACE.
outline	number[][]	yes	Outline in the plate's local 2D frame, metres. Winding is normalised to CCW here, so a caller that hands over a CW outline still gets a correct mesh.
t	number	yes	Plate thickness, m.

FeRotationProbe

WHERE TO MEASURE A ROTATION, for the joint stiffness Sj = M / theta. Named by the CALLER, not found here, and the boundary is deliberate. conn_fea knows plates, bolts and welds; it does not know which plate is a beam web and which is a column flange. The layer that assembles a joint from its members (jointfea.js) knows exactly that, so it names the cross-sections to measure and this returns their rotations. Teaching the FEA member topology to save the caller a box would put the same knowledge in two places. Selection is identical to a load or support region - a box, optionally narrowed to a slab about a plane - so a pitched member's face is describable here for the same reason it is there.

Field	Type	Required	Description
about	number[] | null		The axis to report the rotation about, normally the member's bending axis. None reports the vector only - for a caller that wants to choose the axis after seeing it. Default: null.
at	number[] | null		Default: null.
axis	number[] | null		Default: null.
max	number[]	yes
min	number[]	yes
name	string	yes	The caller's name for this section, echoed back. Sj is a ratio between two of them, and a result that only carried an index would make that pairing positional.
slab	number | null		Default: null.

FeSupport

A restrained REGION: every mesh node inside the axis-aligned box has the listed DOFs fixed. A box rather than a node list because the caller works in geometry, not in mesh indices - and the mesh is rebuilt whenever the element size changes, so any index the caller held would be stale. fixed is [ux, uy, uz, rx, ry, rz] in GLOBAL axes.

Field	Type	Required	Description
at	number[] | null		Default: null.
axis	number[] | null		Optional slab, as on FeLoad: nodes within slab of the plane through at normal to axis. A held member end is a face, and a pitched member's face is not a world-axis box. Default: null.
fixed	boolean[]	yes
max	number[]	yes
min	number[]	yes
slab	number | null		Default: null.

FeWeld

A WELD: ties one plate's edge to another plate, so load can pass between them. The tie is a node-to-surface constraint enforced by penalty, not a merging of nodes. Merging needs coincident nodes, and two plates drawn at their real positions meet at their MID-SURFACES only after trimming - a fin plate's edge sits half a column-flange thickness off the flange's mid-surface, and each plate is meshed independently so no node of one lands on a node of the other. So each welded edge node is instead constrained to move with the point it projects onto on the other plate, including the rigid offset between the two. The weld is treated as RIGID (spec: "start RIGID, refine to a weld stiffness later"). It has no strength here and no flexibility: a weld that would fail is not detected by this, and the component-method weld checks remain the only thing that says whether it is adequate.

Field	Type	Required	Description
end	number[]	yes
penalty	number | null		Penalty stiffness as a multiple of the welded plate's membrane stiffness E t. None uses WELD_PENALTY. Raising it tightens the constraint and worsens the conditioning; the answer must not depend on it, which weld_tie_is_insensitive_to_the_penalty checks. Default: null.
plate	integer	yes	Index into ConnFeaInput::plates of the plate whose EDGE is welded.
start	number[]	yes	The weld line in global coordinates. Boundary nodes of plate within tol of this segment are the ones tied.
to	integer	yes	Index into ConnFeaInput::plates of the plate it is welded TO.
tol	number	yes	How close a boundary node must be to the weld line to be part of it, m.

FloorMode

A mode as the footfall calculation needs it: frequency, the modal mass of the unity-normalised shape, and the unity-normalised amplitudes at the excitation and response points.

Field	Type	Required	Description
frequency_hz	number	yes
modal_mass_kg	number	yes
mu_e	number	yes
mu_r	number	yes

FloorVibrationResult

Used by p354_floor_vibration.

Field	Type	Required	Description
base_value	number	yes
cutoff_hz	number	yes
damping_ratio	number	yes
floor_class	string	yes	"low" or "high", by Table 6.1.
fundamental_hz	number	yes
governing	string	yes
governing_pace_hz	number	yes
limit	number	yes
ok	boolean	yes
response_factor	number	yes	The governing response factor (the larger of steady-state and transient) and where it came from.
standard	string	yes
steady_state	SteadyStateResult | null
steps	Step[]	yes
transient	TransientResult	yes
verified	boolean	yes
warnings	string[]	yes
weighting	Weighting	yes

FootingCode

The design standard for the concrete checks. AS 3600 (default) or ACI 318-19; a FootingStandard impl supplies each code's coefficients (footing_standard.rs). Serialised camelCase ("as3600"/"aci318").

One of: "as3600", "aci318", "eurocode2"

GeoPolygon

A classification polygon: an outer ring plus optional holes, with a name and an optional attribute value (e.g. a wind-region code or a site-class string read from the source feature).

Field	Type	Required	Description
class	string | null		Optional attribute carried from the source feature (e.g. "C", "M", "SITE_CLASS" value). Default: null.
name	string		Default: "".
rings	number[][][]	yes	Rings in GeoJSON order: rings[0] is the outer ring, rings[1..] are holes. Each vertex [lon, lat].

Governing

Field	Type	Required	Description
combination	string	yes
mode	string	yes
util	number	yes

ImposedRow

Used by as1170_1_imposed.

Table 3.1 - reference values of imposed floor actions. udl_kpa/point_kn are None where the standard's cell is not a flat number (a per-metre-of-storage-height rate, a line load, "same as areas providing access", "to be calculated", or a dash) - the full wording lives in note and in the ledger doc, never invented as a spurious float.

Field	Type	Required	Description
category	string	yes
note	string	yes
point_kn	number | null
udl_kpa	number | null
use_	string	yes

Input

A "given" shown at the top of a derivation (the inputs the working starts from).

Field	Type	Required	Description
source	string	yes	Where the value came from (catalogue, member force, assumption) - for traceability.
symbol	string	yes
unit	string	yes
value	number	yes

LoadGroup

One group of Table 2.2, as characteristic wheel loads on the runway beam.

Field	Type	Required	Description
buffer_kn	number	yes
group	integer	yes
h_l_per_rail_kn	number	yes	Horizontal loads the group carries (kN per wheel unless stated): longitudinal H_L per rail, transverse H_T per rail, skewing guide force S, buffer H_B.
h_t_rail1_kn	number	yes
h_t_rail2_kn	number	yes
name	string	yes
note	string	yes
phi_crane	number	yes	The factors the group applies to the crane self-weight and the hoist load.
phi_hoist	number	yes
q_rail1_per_wheel_kn	number	yes	Vertical wheel loads on rail 1 (the near rail, crab at its minimum approach) and rail 2 (kN per wheel).
q_rail2_per_wheel_kn	number	yes
skew_s_kn	number	yes

MaterialAxisResult

Plate results in the material axes of an orthotropic plate (axis 1 = its PlateOrthotropy::axis projected onto the plate). Moments and membrane forces are per metre width and turn as tensors: m1 = mx c^2 + my s^2 + 2 mxy c s, m2 = mx s^2 + my c^2 - 2 mxy c s, m12 = (my - mx) c s + mxy (c^2 - s^2), with the same for n from the membrane forces (stress x thickness).

Field	Type	Required	Description
angle	number	yes	Angle (rad) from the element's local x to material axis 1; element-specific, for tracing.
m1	number	yes	Bending moment along the grain: the one that bends fibres running along axis 1 (N m/m).
m12	number	yes	Twisting moment in the material axes (N m/m).
m2	number	yes	Bending moment for fibres running along axis 2, across the grain (N m/m).
n1	number	yes	Membrane force along axis 1 (N/m, tension positive).
n12	number	yes	In-plane shear force in the material axes (N/m).
n2	number	yes	Membrane force along axis 2 (N/m).

MemberUtilSummary

Field	Type	Required	Description
governing	string	yes
member_id	integer	yes
pass	boolean	yes
utilMax	number	yes

Mesh2d

A triangulated 2D mesh: node coordinates, CCW-wound triangles (indices into nodes), and the subset of node indices that lie on the mesh boundary (outer + hole edges).

Field	Type	Required	Description
boundary_nodes	integer[]	yes
nodes	number[][]	yes
tris	integer[][]	yes

MeshFidelity

Mesh fidelity for a raft solve - the light/deep trade an engineer iterates with. LIGHT is a coarse, fast, preliminary mesh (honestly INDICATIVE on a large mat); DEEP targets the E3 convergence threshold with a high triangle budget, so a large mat converges to a certified result at the cost of a slower (off-thread) solve. Defaults to LIGHT so a quick edit-solve loop stays responsive; the caller opts into DEEP for the final check.

One of: "light", "deep"

ModelStats

Field	Type	Required	Description
combinationCount	integer	yes
hasEnvelope	boolean	yes
loadCaseCount	integer	yes
memberCount	integer	yes
nodeCount	integer	yes
plateCount	integer	yes

OrthotropyInput

How an orthotropic plate's stiffness is given. Constants are in MATERIAL axes (axis 1 along PlateOrthotropy::axis).

One of:

• kind: "material" - Homogeneous orthotropic material; the plate's thickness applies. Pa.

  Field	Type	Required	Description
  e1	number	yes
  e2	number	yes
  g12	number	yes
  g13	number	yes
  g23	number	yes
  kind	"material"	yes
  nu12	number	yes

• kind: "rigidities" - Equivalent rigidities (decking, ribbed/hollowcore slabs, CLT from its layup). A and S in N/m, D in N m. The plate's thickness is then used only for self-weight, mass and the nominal stresses.

PartialFactors

Partial factors. EN 1992-4 Table 4.1 defaults; AS 5216 values unverified (see module doc).

Field	Type	Required	Description
gamma_mc	number	yes
gamma_mp	number	yes
verified	boolean		Steel tension/shear are the caller's AS 4100 design capacities (phi already applied). Default: false.

PassFailRollup

Field	Type	Required	Description
failingMembers	integer	yes
maxUtilOverall	number	yes
pass	boolean	yes
passingMembers	integer	yes
totalMembersChecked	integer	yes

PedestalInput

Used by pedestal_design.

Field	Type	Required	Description
aScTotal	number	yes	TOTAL longitudinal steel area Asc (mm^2), summed over all bars.
barDia	number	yes	Longitudinal bar diameter (mm) - to place the bar centroid off the cover.
braced	boolean	yes	Whether the pedestal is braced against sidesway (Cl 10.3.1). Pedestals are normally braced by the surrounding construction; braced uses the Le/r < 25 limit, unbraced Le/r < 22.
cover	number	yes	Clear cover to the longitudinal bars (mm).
dcX	number	yes	Pedestal plan dimension along global X (mm).
dcY	number	yes	Pedestal plan dimension along global Y (mm).
fPrimeC	number	yes	Concrete characteristic strength f'c (MPa).
fPrimeCBearing	number	yes	Concrete strength at the bearing interface (MPa) - the weaker of the bearing member and the pedestal. Zero means "use the pedestal f'c" (Cl 12.6 takes the weaker of the two concretes).
fSy	number	yes	Reinforcement yield strength fsy (MPa).
height	number	yes	Pedestal height (mm) - used by the (deferred) slenderness classification.
kEff	number	yes	Effective length factor k (Cl 10.5.3). Le = k * height. Default 1.0 is conservative (a pedestal fixed into the footing has a lower k, so 1.0 over-estimates slenderness, which only makes the short-column test stricter - the safe direction, since a slender pedestal is refused).
loadBx	number	yes	Loaded bearing footprint on the pedestal TOP along X (mm) - the steel column or base plate. Zero means "not supplied", and the Cl 12.6 bearing check is then reported NotDetermined.
loadBy	number	yes	Loaded bearing footprint on the pedestal top along Y (mm).
mxStar	number	yes	Design moment about the global X axis (N·mm).
myStar	number	yes	Design moment about the global Y axis (N·mm).
nStar	number	yes	Design axial load N* (N), compression positive.

PedestalResult

Used by pedestal_design.

Field	Type	Required	Description
adequate	boolean | null		Some(true/false) once every check is determined; None while any check is NotDetermined, because an undetermined check cannot be certified adequate.
bearing	CheckState	yes	Cl 12.6 bearing at the loaded interface. Ok when util <= 1; NotDetermined when no loaded area was supplied (bearing cannot be checked without it).
bearingUtil	number	yes	Cl 12.6 bearing utilisation at the loaded interface (NaN when not determined).
fitmentMaxSpacing	number	yes	Cl 10.7.4.3(b)(i): maximum fitment spacing = min(Dc, 15.db) for single bars (mm).
fitmentMinDia	number	yes	Cl 10.7.4.3(a) Table: minimum fitment/tie bar diameter for the longitudinal bar size (mm).
fitments	CheckState	yes	Cl 10.7.3/10.7.4 fitments. Ok = the detailing requirement is determined (min fitment diameter + max spacing below); it states what to provide, not a demand pass/fail.
phiMN	number	yes	Bending capacity at the applied axial load phi.Mn (N·mm) for the governing axis.
phiNuo	number	yes	Squash-load capacity phi.Nuo (N) for the governing axis.
reducedMinPermitted	boolean	yes	Cl 10.7.1(a) proviso: a reduced minimum is permitted when Ag.fsy > 0.15 N*.
slenderness	CheckState	yes	Cl 10.3.1 short-column classification. Ok = short (the M-N check above is valid with slenderness moments taken as zero); NotAdequate = slender (needs the Cl 10.4 moment magnifier, which this module does not perform - the pedestal is refused rather than designed unsafely).
slendernessLimit	number	yes	The short-column limit applied (25 braced / 22 unbraced), Cl 10.3.1.
slendernessRatio	number	yes	Slenderness ratio Le/r (Cl 10.3.1, r per Cl 10.5.2) on the most slender axis.
steelMax	CheckState	yes	Cl 10.7.1(b): Asc <= 0.04 Ag.
steelMin	CheckState	yes	Cl 10.7.1(a): Asc >= 0.01 Ag.
steelRatio	number	yes	Longitudinal steel ratio Asc/Ag.
utilInteraction	number	yes	Governing M-N interaction utilisation (Cl 10). <= 1.0 is adequate.

PileCapInput

Used by pilecap_design.

Field	Type	Required	Description
barDia	number		Main bar diameter (mm) - to place the bar centroid and set the effective depth. Default: 0.
capBx	number		Cap plan dimensions (mm). Default: 0.
capBy	number		Default: 0.
capThickness	number		Cap overall thickness (mm). Default: 0.
capWeight	number	yes	Cap self-weight + soil overburden (N), added to the axial as uniform compression. 0 to ignore.
columnBx	number		Column footprint on the cap (mm) - the flexure/shear critical sections start at the column face. Default: 0.
columnBy	number		Default: 0.
cover	number		Cover to the main (bottom) bars (mm). Default: 0.
fPrimeC	number		Cap concrete strength f'c (MPa). Default: 0.
fSy	number		Reinforcement yield strength fsy (MPa). Default: 0.
mxStar	number	yes	Column design moment about the global X axis (N.m).
myStar	number	yes	Column design moment about the global Y axis (N.m).
nStar	number	yes	Column design axial N* (N), compression positive.
pileCapCompression	number	yes	Single-pile capacity in compression (N). <= 0 => the compression check is NotDetermined.
pileCapTension	number	yes	Single-pile capacity in tension / uplift (N), positive magnitude. 0 means the piles are taken as unable to carry tension, so any uplift fails.
pileDia	number		Pile diameter/side (mm) - the loaded area for the pile-punching check. 0 -> pile punching is not checked (NotDetermined), but column punching still is. Default: 0.
piles	number[][]	yes	Pile plan positions (m), measured from the COLUMN / load point (any consistent origin - the centroid is computed from these).
standard	FootingCode		The concrete design standard (AS 3600 default / ACI 318 / Eurocode 2) for the SHALLOW-cap concrete checks (flexure Cl 8.1, one-way shear Cl 8.2, punching Cl 9.3). Omitted -> AS 3600, so every existing payload is unchanged. The DEEP-cap strut-and-tie model (Section 7) is AS 3600 regardless of this field - a per-code strut-and-tie is out of scope (see strut_and_tie). Default: "as3600".

PileCapResult

Used by pilecap_design.

Field	Type	Required	Description
adequate	boolean | null		Some(true/false) only when the APPLICABLE method is fully checked: a shallow cap by the flexural model (flexure + one-way shear + punching), a deep cap by strut-and-tie. None when the governing method's checks are not all determined (missing geometry) - a deep cap is never certified on the conservative beam model.
capAstReq	number	yes
capFlexure	CheckState	yes	Cap FLEXURE at the column face (AS 3600 Cl 8.1). Ok when the section can carry the design moment (steel found); NotAdequate when it cannot; NotDetermined when no cap geometry supplied.
capMStar	number	yes	Governing design moment at the column face (N.mm) and the required bottom steel (mm^2, total across the cap width) in that direction.
capPunching	CheckState	yes	Cap PUNCHING (Cl 9.3): the worst of column punching (the column into the cap) and pile punching (a pile up through the cap, with free-edge perimeter truncation for edge/corner piles). Ok when the worst util <= 1. NotDetermined when no cap geometry.
capPunchingUtil	number	yes
capShear	CheckState	yes	Cap one-way (beam) SHEAR at d from the column face (Cl 8.2). Ok when V* <= phi.Vuc.
capShearUtil	number	yes
compressionCheck	CheckState	yes	Cl-independent capacity checks.
compressionUtil	number	yes	Compression utilisation = max_reaction / pile_cap_compression.
deepCap	boolean	yes	True when the cap is DEEP - the nearest pile centre is within the effective depth of the column face (a_v <= d). The flexural/beam-shear model is then conservative or inapplicable and the strut-and-tie model (Section 7) governs; strut_tie is that check.
maxReaction	number	yes	Largest compression reaction (N).
minReaction	number	yes	Smallest reaction (N) - negative means uplift.
reactions	number[]	yes	Per-pile axial reaction (N), compression positive, in the input pile order.
strutTie	CheckState	yes	Deep-cap STRUT-AND-TIE model (AS 3600:2018 Section 7). Ok when the model is valid (every strut-to-tie angle >= 30 deg, Cl 7 item (g)) and the strut concrete is adequate; NotAdequate when an angle is too shallow or a strut over-stresses; NotDetermined without the geometry.
strutTieAstReq	number	yes	Required bottom TIE steel Ast (mm^2) in the governing direction = T / (0.85 fsy), Cl 7.3.
strutTieMinAngleDeg	number	yes	Minimum strut-to-tie angle (deg) - below 30 the STM is not permitted.
strutTieUtil	number	yes	Worst strut concrete-stress utilisation (Cl 7.2.3, phi_st 0.65, beta_s Cl 7.2.2) at the pile node.
uplift	boolean	yes	True when any pile is in tension (min_reaction < 0).
upliftCheck	CheckState	yes
upliftUtil	number	yes	Uplift utilisation = |min_reaction| / pile_cap_tension when uplift occurs (else 0). Infinite when a pile lifts but no tension capacity was given.

PileInput

Used by pile_design.

Field	Type	Required	Description
diameter	number	yes	Pile shaft diameter (m). The tip is at the bottom of the last layer (embedded length = sum of the layer thicknesses).
driven	boolean	yes	Driven pile mobilises higher lateral stress on the shaft than a bored one (K factor).
gammaConcrete	number		Concrete unit weight for the pier's own weight (kN/m^3), 24 by default; buoyant below the WT. Default: 24.
hStar	number		Design lateral load at the pier head (kN), applied load_height above ground. 0 = no check. Default: 0.
layers	PileSoilLayer[]	yes	Soil profile, top-down; the pile is embedded through all of it.
loadHeight	number		Height of the lateral load above ground level (m): the base plate height, or 0 at grade. Default: 0.
nStar	number	yes	Design axial compression N* (kN). 0 -> utilisation reported as 0.
nUplift	number		Design uplift (tension) load on the pier (kN). 0 = no check. Default: 0.
phiG	number	yes	AS 2159 geotechnical strength reduction factor phi_g (from the risk assessment, ~0.40-0.65).
tensionShaftFactor	number		Fraction of the compression shaft resistance mobilised in tension (0.7 by default). Default: 0.7.
waterTable	number	yes	Depth to the water table (m from the surface); large = dry.

PileResult

Used by pile_design.

Field	Type	Required	Description
baseUltimate	number	yes	Ultimate base (end bearing) resistance (kN).
design	number	yes	Design geotechnical strength Rd,g = phi_g . Rd,ug (kN).
embeddedLength	number	yes	Embedded length (m) = sum of layer thicknesses.
lateralDesign	number	yes	Lateral: design lateral resistance phi_g x H_u (kN).
lateralMethod	string	yes	"broms-cohesive" or "broms-cohesionless".
lateralMomentAtHStar	number	yes	Lateral: the moment in the pier under H* (Broms scales with the load), kNm.
lateralMomentDepth	number	yes	Lateral: depth below ground to the maximum moment (m).
lateralMomentUltimate	number	yes	Lateral: maximum bending moment in the pier at the ultimate lateral load (kNm), for the section check; scaled to H* in lateral_moment_at_h_star.
lateralSoil	string	yes	The idealised soil the lateral check used: c_u (kPa) or phi' (deg) and gamma' (kN/m^3).
lateralUltimate	number	yes	Lateral: Broms ultimate lateral load at the head (kN).
pierWeight	number	yes	Uplift: the pier's own weight (kN), buoyant below the water table.
shaftUltimate	number	yes	Ultimate shaft (skin friction) resistance (kN).
ultimate	number	yes	Ultimate geotechnical strength Rd,ug = shaft + base (kN).
upliftDesign	number	yes	Uplift: design resistance = phi_g x tension shaft + pier weight (the weight is not a geotechnical strength and takes no phi_g) (kN).
upliftShaftUltimate	number	yes	Uplift: shaft resistance in tension (kN) = tension_shaft_factor x compression shaft.
upliftUltimate	number	yes	Uplift: ultimate resistance = tension shaft + pier weight (kN).
util	number	yes	Utilisation N* / Rd,g (NaN when no capacity).
utilLateral	number	yes	Lateral utilisation H* / lateral_design (NaN when not asked).
utilUplift	number	yes	Uplift utilisation N_uplift / uplift_design (NaN when not asked).
verified	boolean	yes
warnings	string[]	yes

PileSoilLayer

Field	Type	Required	Description
cohesive	boolean	yes	Cohesive (clay) uses su; else cohesionless (sand) uses phi_deg.
gamma	number	yes	Total unit weight (kN/m^3), for the effective overburden.
phiDeg	number	yes	Effective friction angle phi' (deg) - cohesionless layers.
su	number	yes	Undrained shear strength su (kPa) - cohesive layers.
thickness	number	yes	Layer thickness (m), top-down.

PlateMeshInfo

Per-plate mesh bookkeeping, so a caller can attribute anything back to the plate it came from.

Field	Type	Required	Description
holes_cut	integer	yes	Holes actually cut into this plate. Fewer than the bolts aimed at it means one was refused - the reason is in ConnFeaMesh::warnings.
id	string	yes
node_end	integer	yes
node_start	integer	yes	[start, end) into ConnFeaMesh::nodes.
thickness	number	yes
tri_end	integer	yes
tri_start	integer	yes	[start, end) into ConnFeaMesh::tris.

PlateOrthotropy

An orthotropic plate. Kept beside Plate for the same reason as cables: plate literals and saved models that predate it need no change. axis is a GLOBAL direction for material axis 1; each element projects it onto its own plane, so one vector serves a whole panel whatever its corner numbering or orientation.

Field	Type	Required	Description
axis	number[]	yes
input	OrthotropyInput	yes
plate_id	integer	yes

PlateTakeoff

Per-plate take-off line.

Field	Type	Required	Description
area_m2	number	yes
mass_kg	number	yes
num	integer	yes
surface_area_m2	number	yes	One-side surface area (for coating / galvanising estimates).

Polygon

A simple polygonal region: an outer boundary and zero or more holes. outer must wind counter-clockwise; each entry in holes must wind clockwise. Later tasks (constrained Delaunay + hole carving) rely on this winding convention to classify triangles as inside/outside the region.

Field	Type	Required	Description
holes	number[][][]	yes
outer	number[][]	yes

ProbeRotation

One probe's answer.

Field	Type	Required	Description
about	number | null		Its component about about, rad. None when no axis was named or no rotation was fitted.
at	number[]	yes	The centroid of the caught nodes, m - the point the rotation is reported about.
name	string	yes
nodes	integer	yes	How many mesh nodes the probe caught. Reported because a probe over three nodes and one over three hundred are not equally trustworthy, and only the caller can judge which it has.
rotation	number[] | null		The fitted rigid-body rotation, rad, as an axis-angle vector. None when the caught set cannot define one - too few nodes, or too close to collinear.

RaftFeInput

Used by raft_fe_solve.

Input for one unstructured-mesh raft FE run.

Field	Type	Required	Description
columns	ColumnLoad[]	yes
e_concrete	number	yes
ks	number	yes
nu	number	yes
poly	Polygon	yes
self_weight	number	yes
sizing	SizingField	yes
thickness	number	yes

RaftFeResult

Used by raft_fe_solve.

Result of one unstructured-mesh raft FE run.

Field	Type	Required	Description
applied_load	number	yes
converged	boolean	yes
equilibrium_error	number	yes
mesh	Mesh2d	yes
mx_nodes	number[]	yes
mxy_nodes	number[]	yes
my_nodes	number[]	yes
q_max	number	yes
q_min	number	yes
q_nodes	number[]	yes
sum_reaction	number	yes
uz_nodes	number[]	yes
vx_nodes	number[]	yes
vy_nodes	number[]	yes
warnings	string[]	yes

RaftPointInput

Used by raft_design.

Input for a raft reinforcement point.

Field	Type	Required	Description
d	number	yes	Effective depth (mm), concrete strength (MPa), steel yield (MPa).
fPrimeC	number	yes
fSy	number	yes
mx	number	yes	Plate bending + twisting moments per metre (N.mm/m): Mx, My, Mxy.
mxy	number	yes
my	number	yes

RaftReo

Used by raft_design.

Raft reinforcement at a point: the required steel (mm^2 per metre width) in each direction, each face, from the Wood-Armer design moments. d = effective depth (mm), f_prime_c, f_sy (MPa). A moment a 1 m section cannot carry returns None for that entry (honest - never a silent 0).

Field	Type	Required	Description
astXBottom	number | null		Bottom/top steel in the X and Y directions, mm^2/m. None = the section cannot carry that moment.
astXTop	number | null
astYBottom	number | null
astYTop	number | null
design	WoodArmer	yes	The Wood-Armer design moments used (per metre: N.mm/m).

RcDesignStatus

One of:

• "ok" - Steel found within the limits.
• "too_small" - No steel within the limits works: the section has to grow.
• "review" - Steel found, but part of the design is not covered here (fitments, slenderness).
• "not_determined" - The input cannot be designed (no section, no f'c).

ReactionExtreme

Field	Type	Required	Description
component	string	yes
load_case_id	integer	yes
node_id	integer	yes
value	number	yes

ReinforcementClass

THE REINFORCEMENT'S DUCTILITY CLASS - AS/NZS 4671, and what AS 3600 Table 2.2.2(b) does with it. For bending without axial tension or compression the standard gives two different capacity reduction factors, and they are not close: (b)(i) Class N reinforcement and/or tendons: 0.65 <= phi = 1.24 - 13 k_uo / 12 <= 0.85 (b)(ii) Class L reinforcement: phi = 0.65, flat A lightly reinforced pad designed on the Class N curve gets phi near 0.85; the same pad with mesh gets 0.65, which is 24% less capacity for the same bars. Designing mesh on the Class N factor is therefore unconservative by about that much, and nothing in the geometry says which was meant - only the specification does. MESH IS CLASS L, and is a separate variant rather than an alias because the two are different things to a detailer even though Table 2.2.2 treats them alike: a schedule that says "mesh" and a schedule that says "Class L bars" are not the same document. phi is identical for both, and the code says so at the one place it is read rather than by leaving them to look coincidental.

One of:

• "n" - Normal ductility - deformed bar to AS/NZS 4671. The default, and what every result before 2026-09-09 assumed.
• "l" - Low ductility bar.
• "mesh" - Welded wire mesh, which is Class L for Table 2.2.2.

RestraintEdge

The edge a bending member's lateral restraints hold (Cl 3.2.3.2).

One of:

• "compression", "tension"
• "tension_and_torsional" - Continuous tension-edge restraint plus torsional restraints at la_phi (Eq 3.2(8)).

RidgeTieCapacity

Used by ridge_tie_cleat_check.

Field	Type	Required	Description
governing	string	yes
util_bolt_shear	number	yes
util_max	number	yes
util_plate_axial	number	yes
util_plate_bearing	number	yes
util_plate_bending	number	yes
util_plate_shear	number	yes
util_tie_bearing	number	yes
util_weld	number	yes

RobustnessResult

Used by en1991_1_7_robustness.

Field	Type	Required	Description
class	ConsequencesClass	yes
class_examples	string	yes
class_label	string	yes
construction	Construction	yes
f_t	number | null		A6.2: F_t (kN/m or kN), None for framed construction.
horizontal_ties_required	boolean	yes	Whether the strategy asks for horizontal ties at all (Class 2 and above).
key_element_ad_kpa	number	yes	A9: the key-element accidental design action A_d (kN/m2), horizontal and vertical, one at a time.
notional_removal_damage_limit	number	yes	A5(c): the admissible local damage on notional removal, 15 percent of the floor in each of two adjacent storeys.
standard	string	yes
steps	Step[]	yes
strategy	string	yes
t_internal	number	yes	A6.1 framed: internal tie force T_i (kN) and perimeter tie force T_p (kN); A6.2 wall: internal T_i (kN/m of floor width) and peripheral T_p (kN).
t_perimeter	number	yes
t_vertical	number | null		A7: framed, the accidental design tensile force on the column (kN); wall, the vertical tie force (N per the formula, reported in kN/m of wall).
t_vertical_units	string	yes
tie_units	string	yes	The unit the horizontal tie forces are in: "kN" (framed) or "kN/m, kN" (wall internal, peripheral).
verified	boolean	yes
vertical_ties_required	boolean	yes	Whether the strategy asks for vertical ties or the notional-removal alternative (Class 2b).
warnings	string[]	yes

RoofSnow

Used by as1170_snow_load.

Field	Type	Required	Description
balanced_only	boolean	yes
cases	SnowCase[]	yes
ce	number	yes
citation	string	yes
equation	string	yes
gamma_kn_m3	number	yes
kp	number	yes
overhang_kn_m	number	yes	Cl 4.2.3: the edge overhang load, kN per metre of eave, from the peak case.
peak_kpa	number	yes	The largest load any case puts on any slope, kPa - the number a first pass sizes to.
sg_kpa	number	yes

SectionRollup

Roll-up by section name (matches the JS bySection shape).

Field	Type	Required	Description
count	integer	yes
mass_per_metre_kg	number	yes
section	string	yes
totalLength_m	number	yes
totalMass_kg	number	yes

SettlementInput

Used by settlement_design.

Field	Type	Required	Description
b	number	yes	Footing plan dimensions (m). The least dimension is used as B in the elastic formula.
cc	number	yes	Compression index Cc (virgin line slope).
cr	number	yes	Recompression index Cr (unload-reload slope). 0 falls back to Cc when overconsolidated.
depthFactor	number	yes	Embedment (depth) correction factor I_F (<= 1), Fox's correction. 1.0 (default/conservative) ignores the reduction from founding below the surface.
e0	number	yes	Initial void ratio e0.
eSoil	number	yes	Soil drained (long-term) or undrained elastic modulus for the immediate part (kPa).
hLayer	number	yes	Compressible layer thickness (m). <= 0 means "no consolidation layer" -> ConsolState::NotComputed.
l	number	yes
nuSoil	number	yes	Soil Poisson's ratio (-).
qNet	number	yes	Net applied bearing pressure at founding level (kPa) - the pressure ABOVE the pre-existing overburden, which is what drives settlement.
sigmaPc	number	yes	Preconsolidation pressure sigma'_p (kPa). <= sigma'_0 is treated as normally consolidated.
sigmaV0	number	yes	Initial vertical effective stress at mid-layer, sigma'_0 (kPa).
zToMid	number	yes	Depth from founding level to the MIDDLE of the compressible layer (m), where the representative stress increase is evaluated.

SettlementResult

Used by settlement_design.

Field	Type	Required	Description
consolState	ConsolState	yes	Which e-log(sigma') branch was used (or NotComputed).
consolidation	number	yes	Primary consolidation settlement (mm); 0 with state NotComputed when there is no layer.
deltaSigmaMid	number	yes	Stress increase at mid-layer from the 2:1 spread, delta-sigma (kPa).
immediate	number	yes	Immediate (elastic) settlement (mm).
total	number	yes	Total settlement (mm) = immediate + consolidation.

SgCombination

A factored load combination.

Field	Type	Required	Description
id	integer	yes
name	string	yes
terms	SgCombinationTerm[]	yes

SgCombinationTerm

One term in a load combination: (load_case_id * factor).

Field	Type	Required	Description
factor	number	yes
load_case_id	integer	yes

SgEndRelease

End-release flags for a member end (true = released, false = fixed).

Field	Type	Required	Description
fx	boolean	yes
fy	boolean	yes
fz	boolean	yes
mx	boolean	yes
my	boolean	yes
mz	boolean	yes

SgEntryInfo

Used by list_sg_entries.

Field	Type	Required	Description
name	string	yes
size	integer	yes

SgImportDiagnostics

Diagnostic summary produced during import_sg_model.

Field	Type	Required	Description
decoded_tags	string[]	yes	Tags that were successfully decoded.
missing_tags	string[]	yes	Tags that were not present at all.
skipped_tags	string[]	yes	Tags that were present in the archive but are intentionally skipped (e.g. large result blobs or tags not yet decoded).

SgLoadCase

Field	Type	Required	Description
id	integer	yes
name	string		Default: "".

SgMaterial

Field	Type	Required	Description
alpha	number		Default: 0.
density	number	yes
e	number	yes
fu	number		Default: 0.
fy	number		Default: 0.
g	number	yes
id	integer	yes
library	string		Default: "".
name	string	yes
nu	number	yes

SgMember

Field	Type	Required	Description
id	integer	yes
material_id	integer	yes
name	string		Member name / description from @SD (empty if not present). Default: "".
node_a	integer	yes
node_b	integer	yes
release_a	SgEndRelease	yes
release_b	SgEndRelease	yes
section_id	integer	yes

SgMemberLoad

Field	Type	Required	Description
load_case_id	integer	yes
load_type	integer	yes	SpaceGass load category code (kept for diagnostics; 1/2/3 = load grouping).
member_id	integer	yes
qx	number	yes	Distributed load intensity at the START of the loaded length, in SI (N/m), resolved onto global axes. qy is vertical (negative = gravity).
qx2	number	yes	Intensity at the END of the loaded length (N/m). Equal to the start value for a uniform UDL; differs only for a trapezoidal load.
qy	number	yes
qy2	number	yes
qz	number	yes
qz2	number	yes

SgMemberOffset

Field	Type	Required	Description
axis	integer	yes	0 = global axes, 1 = local axes (best-effort, observed as 0 in samples).
member_id	integer	yes
offset_a	number[]	yes	Offset at end A [dx, dy, dz] in metres.
offset_b	number[]	yes	Offset at end B [dx, dy, dz] in metres.

SgMemberPointLoad

Field	Type	Required	Description
axis	integer	yes	0/1 = global/local axes (best-effort).
fx	number	yes	Forces in Newtons (converted from kN stored in file).
fy	number	yes
fz	number	yes
load_case_id	integer	yes
member_id	integer	yes
mx	number	yes	Moments in N·m (converted from kN·m stored in file).
my	number	yes
mz	number	yes
position_ratio	number	yes	Load position as a ratio (0.0 to 1.0) along the member.
sub_load	integer	yes	Sub-load index (SpaceGass internal grouping).

SgModel

Used by import_sg_model.

Field	Type	Required	Description
combinations	SgCombination[]	yes
connection_config	ConnectionConfig | null
diagnostics	SgImportDiagnostics	yes
entries	SgEntryInfo[]	yes
load_cases	SgLoadCase[]	yes
materials	SgMaterial[]	yes
member_loads	SgMemberLoad[]	yes
member_offsets	SgMemberOffset[]	yes
member_point_loads	SgMemberPointLoad[]	yes
members	SgMember[]	yes
nodal_loads	SgNodalLoad[]	yes
nodes	SgNode[]	yes
plate_loads	SgPlateLoad[]	yes
plates	SgPlate[]	yes
restraints	SgRestraint[]	yes
section_info	SgSectionInfo | null
sections	SgSection[]	yes
self_weights	SgSelfWeight[]	yes

SgNodalLoad

Field	Type	Required	Description
fx	number	yes	Forces in Newtons (converted from kN stored in file).
fy	number	yes
fz	number	yes
load_case_id	integer	yes
mx	number	yes	Moments in N\u00b7m (converted from kN\u00b7m stored in file).
my	number	yes
mz	number	yes
node_id	integer	yes

SgNode

Field	Type	Required	Description
id	integer	yes
x	number	yes
y	number	yes
z	number	yes

SgPlate

Field	Type	Required	Description
id	integer	yes
material_id	integer	yes
node_ids	integer[]	yes
thickness	number	yes	Thickness in metres (0.0 when not decoded).

SgPlateLoad

Field	Type	Required	Description
load_case_id	integer	yes
plate_id	integer	yes
pressure	number	yes	Pressure in Pa (positive = upward in local z).

SgRestraint

Field	Type	Required	Description
flags	integer	yes	DOF bit-mask: bit 0=Tx, 1=Ty, 2=Tz, 3=Rx, 4=Ry, 5=Rz.
node_id	integer	yes
raw_code	string	yes	Raw 4-char ASCII code from the binary record (for diagnostics).

SgSection

Field	Type	Required	Description
a	number	yes	Cross-sectional area in m² (0.0 when not decoded).
grade	string	yes	Steel grade label, e.g. "AUST300" (best-effort; may be a section tag).
id	integer	yes	1-based section id - matches SgMember.section_id (the @MB section index).
iyy	number	yes	Strong-axis second moment of area Iyy in m⁴ (0.0 when not decoded).
izz	number	yes	Weak-axis second moment of area Izz in m⁴ (0.0 when not decoded).
j	number	yes	St. Venant torsion constant J in m⁴ (0.0 when not decoded).
name	string	yes	Catalogue profile name as stored by SpaceGass, e.g. "460 UB 67.1", "100758 UA", "W10x12". Empty when a block carries no catalogue name.
tapered	boolean	yes	True when this section is a tapered/custom profile (no catalogue name).

SgSectionInfo

Field	Type	Required	Description
field_0_1	integer	yes	Header field at bytes 0-1 (observed = 0x0200 = 512). Meaning unknown; kept for diagnostics.
field_2_3	integer	yes	Header field at bytes 2-3 (observed = 0x0578 = 1400). Meaning unknown; kept for diagnostics.
field_4_7	integer	yes	Header field at bytes 4-7 (observed = 30). Meaning unknown; kept for diagnostics.
has_header	boolean	yes	True when the blob looks like a recognised header.
raw_size	integer	yes	Raw size of the @SI blob (for diagnostics).
records	SgSectionInfoRecord[]	yes	Decoded variable-length records at the tail of the blob.

SgSectionInfoRecord

One variable-length record stored inside @SI. In the only sample that carries @SI (Portal Frame Worked Example.SG) these records are site/seismic data (type 9, e.g. "NEWCASTLE 5%") rather than section geometry. The shape is exposed so callers can inspect it and so the decoder can be extended once a sample with true custom-section geometry appears.

Field	Type	Required	Description
factors	number[]	yes
name	string	yes
record_type	integer	yes

SgSelfWeight

Field	Type	Required	Description
factor	number	yes	Multiplier on self-weight (>=0). SpaceGass stores this as a signed acceleration; the sign indicates direction (negative = downward) and the magnitude is the factor applied to self-weight.
load_case_id	integer	yes

SizingField

Controls target element size and local refinement for the mesher (Task 3).

Field	Type	Required	Description
grade_rate	number		How fast the size GROWS away from a refine point: h = target + grade_rate * distance. 1.0 (the default) is the unit slope this field always had. A member stub graded away from the joint wants ~0.2: fine at the cut face, coarsening over a few section depths. Default: 1.
h_max	number	yes	Largest element edge length permitted anywhere in the mesh.
h_min	number	yes	Smallest element edge length the refiner is allowed to introduce (prevents non-termination from infinitely shrinking triangles near sharp features).
min_angle_deg	number	yes	Minimum interior angle (degrees) Ruppert refinement (Task 3) will enforce.
refine_points	[number[], number][]	yes	Point-based local refinement: (location, target size). Element size is tightened near each point down to the given target, bounded below by h_min.

SnowCase

One load case of the roof snow load.

Field	Type	Required	Description
label	string	yes	Which figure and case this is, e.g. "Figure 6.3 case (iv), windward slope".
leeward_kpa	number	yes	Load on the leeward slope, kPa; equal to windward_kpa on a mono-pitched roof.
windward_kpa	number	yes	Load on the windward (or the only) slope, kPa.

SoilLayer

A soil layer for the Appendix D computation.

Field	Type	Required	Description
ipt	number	yes	Instability index Ipt (%/pF) for the layer (lateral-restraint factor assumed folded in).
thickness_mm	number	yes	Layer thickness (mm).

Species

Hardwood or softwood: an F-grade's tension strength differs between them (Table H2.1).

One of: "softwood", "hardwood"

StationOutput

One of: "objects", "pack", "none"

SteadyContribution

One (mode, harmonic) steady-state contribution at the governing pace frequency.

Field	Type	Required	Description
a_w_rms	number	yes
alpha_h	number	yes
beta	number	yes
force_n	number	yes
harmonic	integer	yes
harmonic_hz	number	yes
magnification	number	yes
mode	integer	yes
weighting	number	yes

SteadyStateResult

Field	Type	Required	Description
a_w_rms	number	yes
build_up_factor	number	yes
contributions	SteadyContribution[]	yes
pace_hz	number	yes
response_factor	number	yes
sweep	number[][]	yes	Response factor at every pace frequency swept, as (f_p, R) pairs.

Step

One line of working: symbol = formula = subs = value [unit] (clause).

Field	Type	Required	Description
clause	CodeRef	yes	Governing code reference (standard + year + clause), travelling with the value.
formula	string	yes	Symbolic LaTeX, no numbers.
note	string | null
status	StepStatus	yes
subs	string	yes	The same expression with values substituted (LaTeX).
symbol	string	yes
unit	string	yes
value	number	yes	The scalar result of this line, in the unit named by unit. Source of truth.

StepStatus

Status of a derivation line. The final/headline line of a check is a pass/fail; intermediate working lines are Info. Serialises to the lowercase strings the JS renderer expects.

One of:

• "info", "pass", "fail"
• "na" - Not applicable (e.g. a branch that doesn't govern for this section).

SurfaceKind

Which face of the building a surface is. National adapters map these to their own coefficient tables.

One of: "windward_wall", "leeward_wall", "side_wall", "windward_roof", "leeward_roof"

SurfacePressure

Assembled design pressures on one surface for one direction (core output, standard-agnostic).

Field	Type	Required	Description
area	number	yes
cfig_ext	number	yes
cfig_ext_alt	number	yes	Alternate design shape factor (roof pressure/less-negative case); equals cfig_ext if only one.
direction	WindDirection	yes
kind	SurfaceKind	yes
name	string	yes
p_ext_alt_pa	number	yes	External pressure for the ALTERNATE case q * Cfig,e_alt (Pa) - roofs: the pressure/downward case.
p_ext_pa	number	yes	External pressure p_e = q * Cfig,e (Pa) for the governing (uplift) case.
p_net_ineg_pa	number	yes	Net pressure with the internal-suction case (q*(Cfig,e - Cfig,i_neg)), Pa.
p_net_ipos_pa	number	yes	Net pressure with the internal-pressure case (q*(Cfig,e - Cfig,i_pos)), Pa.

TableStatus

One table the adapter's numbers stand on, and what it was verified against. A verified: false row names what stands in for the table.

Field	Type	Required	Description
against	string	yes
table	string	yes
verified	boolean	yes

TakeoffLine

Per-member take-off line (matches the JS quantityTakeoff line shape).

Field	Type	Required	Description
costed	boolean	yes
length_m	number	yes
mass_kg	number	yes
mass_per_metre_kg	number	yes
num	integer	yes
section	string	yes
surface_area_m2	number	yes	Paintable / galvanisable surface area (m²), zero when section dimensions are unavailable.

TakeoffReport

Used by quantity_takeoff.

Complete take-off report (JS-compatible shape).

Field	Type	Required	Description
bySection	SectionRollup[]	yes	Per-section roll-ups, heaviest first.
lines	TakeoffLine[]	yes	Per-member lines, in model order.
plates	PlateTakeoff[]	yes	Plate take-off lines.
totals	TakeoffTotals	yes	Grand totals.

TakeoffTotals

Grand totals.

Field	Type	Required	Description
length_m	number	yes
mass_kg	number	yes
memberCount	integer	yes
uncosted	integer	yes	Members that could not be costed (missing section, material, or nodes).

TransientContribution

One mode's transient (impulse) contribution at the governing pace frequency.

Field	Type	Required	Description
a_w_peak	number	yes
frequency_hz	number	yes
impulse_ns	number	yes
mode	integer	yes
weighting	number	yes

TransientResult

Field	Type	Required	Description
a_w_peak	number	yes
a_w_rms	number	yes
contributions	TransientContribution[]	yes
pace_hz	number	yes
response_factor	number	yes
sweep	number[][]	yes

ValidationResult

Used by validate_model.

Result of validating a single snapshot.

Field	Type	Required	Description
valid	boolean	yes
violations	Violation[]	yes

Violation

A single validation violation.

Field	Type	Required	Description
detail	string	yes
entity	string	yes
field	string	yes
id	string	yes
kind	string	yes
severity	string	yes

WasmAisc360Assumptions

Field	Type	Required	Description
cb	number	yes
compressionClause	string		"E7" when a slender element cut the compression area below gross (Pn = Fcr Ae), else "E3". Default: "".
lb	number	yes
leMajor	number	yes
leMinor	number	yes

WasmAisc360CompositeInput

Used by aisc360_composite_check.

Field	Type	Required	Description
a_s	number	yes
b_eff_mm	number	yes
d_mm	number	yes
f_prime_c_mpa	number	yes
fu_stud_mpa	number	yes
fy_mpa	number	yes
n_studs	integer	yes
phi	number		Default: 0.9.
stud_dia_mm	number	yes
t_c_mm	number	yes

WasmAisc360CompositeResult

Used by aisc360_composite_check.

Field	Type	Required	Description
degree_of_shear_connection	number	yes
horizontal_shear_force	number	yes
phi_mn_full	number	yes
phi_mn_partial	number	yes
stud_shear_force	number	yes

WasmAisc360MemberInput

Used by aisc360_member_check.

Field	Type	Required	Description
a	number	yes
bf	number	yes
cb	number		Default: 0.
d	number	yes
e	number		Default: 0.
fu	number		Default: 0.
fy	number	yes
hollow	boolean		A hollow section (RHS/SHS/CHS). Slender-element compression (E7) is applied to I-shapes only until the hollow-wall case, Table E7.1 (b), is in; absent means an I-shape. Default: false.
iyy	number	yes
izz	number	yes
j	number	yes
lb	number	yes
leMajor	number	yes
leMinor	number	yes
mxStar	number	yes
myStar	number	yes
nStar	number	yes
szz	number		Default: 0.
tf	number	yes
tw	number	yes
vxStar	number	yes
zzz	number		Default: 0.

WasmAisc360MemberResult

Used by aisc360_member_check.

Field	Type	Required	Description
assumptions	WasmAisc360Assumptions	yes
governing	string	yes
phiMnx	number	yes
phiMny	number	yes
phiPn	number	yes
phiPnComp	number	yes
phiVn	number	yes
section_class	string	yes
utilAxial	number	yes
utilCombined	number	yes
utilFlexX	number	yes
utilFlexY	number	yes
utilMax	number	yes
utilShear	number	yes

WasmAiscBoltInput

Used by aisc360_bolt_capacity.

Field	Type	Required	Description
bolt_diameter	number	yes
bolt_grade	string	yes
clear_distance	number		Default: 0.
n_shear_planes	integer	yes
ply_fu	number		Default: 0.
ply_thickness	number		Default: 0.
threads_excluded	boolean		Default: false.

WasmAiscBoltResult

Used by aisc360_bolt_capacity.

Field	Type	Required	Description
phiRnBearing	number	yes
phiRnShear	number	yes
phiRnTearout	number	yes
phiRnTension	number	yes

WasmAiscWeldInput

Used by aisc360_weld_capacity.

Field	Type	Required	Description
fexx	number	yes
leg_size	number	yes
length	number	yes
theta_deg	number		Default: 0.

WasmAiscWeldResult

Used by aisc360_weld_capacity.

Field	Type	Required	Description
phiRn	number	yes

WasmAs1720Input

Used by as1720_timber_check.

The timber check input: fem_core::as1720::TimberMemberInput plus the two legacy length fields. le_bending was the restraint spacing and le_compression the column length (g13 1); both still work, and the new la_y / length win when given. The legacy k7 / k13 fields are accepted and ignored: k7 is the bearing factor, not a load-sharing one, and the standard has no k13 for columns (it is k12).

Field	Type	Required	Description
a_t	number | null		Net tension area (mm²) when holes reduce it; defaults to the gross area. Default: null.
b	number		Breadth of ONE board (mm). Stability uses it; area and Z use n_boards · b. Default: 0.
category	integer		Application category 1, 2 or 3 (Table 2.1). Default: 2.
d	number		Default: 0.
g13x	number		Effective length factors g13 about x (major) and y (minor), Table 3.2. Default: 1.
g13y	number		Default: 1.
grade	string		Default: "F17".
high_temp	boolean		Seasoned timber in Queensland north of 25°S or elsewhere north of 16°S: k6 = 0.9. Default: false.
k1	number		Default: 1.
k12	number | null		Default: null.
k12c	number | null		Default: null.
k4	number | null		Default: null.
k6	number | null		Default: null.
k9	number | null		Default: null.
la_phi	number | null		Spacing of torsional restraints (only for TensionAndTorsional). Default: null.
la_y	number | null		Spacing of restraints against lateral (minor-axis) displacement, for S1 and S4. Defaults to length. Default: null.
le_bending	number		Default: 0.
le_compression	number		Default: 0.
length	number | null		Member length L (mm): the span for k9 and the length for column buckling. Default: null.
m_star	number		Default: 0.
n_boards	integer		Boards nailed or screwed side by side (a "2/190x35" is 2). Default: 1.
n_members	integer		Members in the parallel system for k9 (1 = single member) and their spacing (mm). Default: 1.
n_star	number		Default: 0.
nt_star	number		Default: 0.
partial_seasoning	boolean		Unseasoned timber that will partly season in service: k4 by least dimension (Table 2.5). Default: false.
r	number		Ratio of temporary to total design action effect (Appendix E2); ≤ 0 is taken as 0.25. Default: 0.25.
restraint_edge	RestraintEdge		Default: "compression".
seasoned	boolean		Default: true.
spacing	number		Default: 0.
species	Species		Default: "softwood".
v_star	number		Default: 0.

WasmAs1720Result

Used by as1720_timber_check.

Field	Type	Required	Description
E	number	yes
S1	number	yes
S3	number	yes
S4	number	yes
continuousRestraint	boolean	yes
fB	number	yes
fC	number	yes
fS	number	yes
fT	number	yes
governing	string	yes
k1	number	yes
k12	number	yes
k12c	number	yes
k12x	number	yes
k12y	number	yes
k4	number	yes
k6	number	yes
k9	number	yes
phi	number	yes
phiM	number	yes
phiN	number	yes	Compression capacity, the smaller of the two axes.
phiNcx	number	yes
phiNcy	number	yes
phiNt	number	yes
phiV	number	yes
rhoB	number	yes
rhoC	number	yes
stabilityAssessed	boolean	yes
utilM	number	yes
utilMax	number	yes
utilN	number	yes
utilNt	number	yes
utilV	number	yes

WasmAs2870Input

Used by as2870_design.

Field	Type	Required	Description
construction	string		Default: "".
du_surface	number		Default: 1.2.
footing_system	string		Default: "".
hs_m	number		Default: 1.5.
layers	SoilLayer[]		Default: [].
site_class	string		Optional: skip the soil profile and use this class directly ("M", "H1-D", ...). Default: "".
slab_length_m	number		Default: 15.

WasmAs4100AlphaMInput

Used by as4100_alpha_m.

Field	Type	Required	Description
my1	number	yes
my2	number	yes

WasmAs4100AlphaMResult

Used by as4100_alpha_m.

Field	Type	Required	Description
alpha_m	number	yes

WasmAs4100CellularInput

Used by as4100_cellular_check.

Field	Type	Required	Description
alpha_b	number		Default: 0.
alpha_m_case	integer	yes
b_f_mm	number	yes
d_mm	number	yes
d_o_mm	number	yes
fy_mpa	number	yes
le_mm	number	yes
length_mm	number	yes
s_mm	number	yes
t_f_mm	number	yes
t_w_mm	number	yes

WasmAs4100CellularResult

Used by as4100_cellular_check.

Field	Type	Required	Description
phi_m_b	number	yes
phi_m_gross	number	yes
phi_m_net	number	yes
phi_m_vierendeel	number	yes
phi_v_net	number	yes
phi_v_web_post	number	yes
web_post_slenderness	number	yes

WasmAs4100CombinedInput

Used by as4100_combined.

Field	Type	Required	Description
kf	number		Default: 1.
m_star_x	number	yes
m_star_y	number		Default: 0.
n_star	number	yes
ns	number	yes
phi_mbx	number	yes
phi_mby	number		Default: 0.
phi_msx	number	yes
phi_msy	number		Default: 0.
phi_ncx	number	yes
phi_ncy	number	yes
phi_nt	number	yes
section_class	string	yes

WasmAs4100CombinedResult

Used by as4100_combined.

Field	Type	Required	Description
axial_util	number	yes
member_util_x	number	yes
member_util_y	number	yes
phi_m_ox	number	yes
phi_m_oy	number	yes
phi_m_rx	number	yes
phi_m_ry	number	yes
section_util_x	number	yes
section_util_y	number	yes
util_biaxial_member	number	yes
util_biaxial_section	number	yes
util_max	number	yes

WasmAs4100FatigueInput

Used by as4100_fatigue_check.

Field	Type	Required	Description
apply_beta_tf	boolean		Default: false.
category	string	yes
fy_mpa	number	yes
phi	number		Default: 0.9.
spectrum	[number, number][]	yes
t_mm	number	yes

WasmAs4100FatigueResult

Used by as4100_fatigue_check.

Field	Type	Required	Description
applicable	boolean	yes
damage	number	yes
ok	boolean	yes

WasmAs4100FireInput

Used by as4100_fire_check.

Field	Type	Required	Description
ambient_capacity	number	yes
exposure	string	yes
fire_demand	number	yes
section_factor	number	yes
time_min	number	yes

WasmAs4100FireResult

Used by as4100_fire_check.

Field	Type	Required	Description
limiting_temp	number	yes
load_ratio	number	yes
ok	boolean	yes
steel_temp	number	yes
temp_margin	number	yes

WasmAs4100OptimizeInput

Used by as4100_optimize_section.

Field	Type	Required	Description
alpha_b	number		Default: 0.
alpha_m_case	integer	yes
categories	string[]		Default: [].
fy_mpa	number	yes
le_mm	number	yes
mx_star	number	yes
my_star	number		Default: 0.
n_star	number	yes
v_star	number	yes

WasmAs4100OptimizeResult

Used by as4100_optimize_section.

Field	Type	Required	Description
best_category	string	yes
best_mass_kg_m	number	yes
best_name	string	yes
considered	integer	yes
feasible	integer	yes
found	boolean	yes
util_max	number	yes

WasmAs4100PhiMbxInput

Used by as4100_phi_mbx, as4100_phi_mbx_derivation.

Field	Type	Required	Description
alpha_m_case	integer	yes	0=UniformMoment, 1=SimplySupportedUdl, 2=SimplySupportedPointLoad, 3=EndMoments, 4=CantileverUdl
beta_m	number		Default: 0.
bf	number	yes
d	number	yes
e	number		Default: 200000.
fyf	number	yes
fyw	number	yes
g	number		Default: 80000.
i_w	number		Default: 0.
i_y	number	yes
j	number	yes
le_mm	number	yes
phi	number		Default: 0.9.
s_x	number	yes
tf	number	yes
tw	number	yes
z_x	number	yes

WasmAs4100PhiMbxResult

Used by as4100_phi_mbx.

Field	Type	Required	Description
alpha_m	number	yes
alpha_s	number	yes
m_o	number	yes
m_sx	number	yes
phi_m_bx	number	yes

WasmAs4100PhiMsResult

Used by as4100_phi_ms.

Field	Type	Required	Description
lambda_s	number	yes
lambda_sp	number	yes
lambda_sy	number	yes
m_sx	number	yes
phi_m_sx	number	yes
section_class	string	yes
z_ex	number	yes

WasmAs4100PhiNcInput

Used by as4100_phi_nc, as4100_phi_nc_derivation.

Field	Type	Required	Description
alpha_b	number		Default: 0.
area	number	yes
fy	number	yes
kf	number		Default: 1.
le_mm	number	yes
phi	number		Default: 0.9.
r	number	yes

WasmAs4100PhiNcResult

Used by as4100_phi_nc.

Field	Type	Required	Description
alpha_c	number	yes
lambda_n	number	yes
n_c	number	yes
n_s	number	yes
phi_n_c	number	yes

WasmAs4100PhiVvInput

Used by as4100_phi_vv.

Field	Type	Required	Description
d	number	yes
fy	number	yes
section_name	string	yes
tf	number	yes
tw	number	yes

WasmAs4100PhiVvResult

Used by as4100_phi_vv.

Field	Type	Required	Description
phi_vv	number	yes

WasmAs4100SectionInput

Used by as4100_phi_ms, as4100_phi_ms_derivation.

Field	Type	Required	Description
bf	number	yes
d	number	yes
fyf	number	yes
fyw	number	yes
s_x	number	yes
tf	number	yes
tw	number	yes
z_x	number	yes

WasmAs4100TaperedInput

Used by as4100_tapered_check.

Field	Type	Required	Description
alpha_b	number		Default: 0.
alpha_m_case	integer	yes
b_f_mm	number	yes
d_a_mm	number	yes
d_b_mm	number	yes
fy_mpa	number	yes
le_mm	number	yes
length_mm	number	yes
t_f_mm	number	yes
t_w_mm	number	yes

WasmAs4100TaperedResult

Used by as4100_tapered_check.

Field	Type	Required	Description
d_govern_mm	number	yes
phi_mb	number	yes
phi_ms	number	yes
phi_nc	number	yes
taper_ratio	number	yes
x_govern_mm	number	yes

WasmAs4600CombinedInput

Used by as4600_combined.

Field	Type	Required	Description
m_star_x	number		Default: 0.
m_star_y	number		Default: 0.
n_comp	number		Default: 0.
n_tens	number		Default: 0.
phi_mbx	number		Default: 0.
phi_mby	number		Default: 0.
phi_ncx	number		Default: 0.
phi_ncy	number		Default: 0.
phi_nt	number		Default: 0.

WasmAs4600Input

Used by as4600_capacity.

Field	Type	Required	Description
b	number	yes
d	number	yes
e	number		Default: 200000.
f_y	number	yes
lip	number		Default: 0.
r	number		Default: 0.
section_type	string	yes
t	number	yes

WasmAs4600Result

Used by as4600_capacity.

Field	Type	Required	Description
aEff	number	yes
aGross	number	yes
governing	string	yes
phiMs	number	yes
phiNc	number	yes
zEff	number	yes
zGross	number	yes

WasmAs5100Assumptions

Field	Type	Required	Description
alpha_m	number	yes
alpha_s	number	yes
leMajor	number	yes
leMinor	number	yes
section_class	string	yes

WasmAs5100CombinedInput

Used by as5100_combined.

Field	Type	Required	Description
kf	number		Default: 1.
mStarX	number	yes
mStarY	number		Default: 0.
nStar	number	yes
ns	number	yes
phiMbx	number	yes
phiMby	number		Default: 0.
phiMsx	number	yes
phiMsy	number		Default: 0.
phiNcx	number	yes
phiNcy	number	yes
phiNt	number	yes
sectionClass	string	yes

WasmAs5100CombinedResult

Used by as5100_combined.

Field	Type	Required	Description
axialUtil	number	yes
memberUtilX	number	yes
memberUtilY	number	yes
phiMOx	number	yes
phiMOy	number	yes
phiMRx	number	yes
phiMRy	number	yes
sectionUtilX	number	yes
sectionUtilY	number	yes
utilBiaxialMember	number	yes
utilBiaxialSection	number	yes
utilMax	number	yes

WasmAs5100MemberInput

Used by as5100_member_check.

Field	Type	Required	Description
a	number	yes
alphaMCase	integer	yes	0=UniformMoment, 1=SimplySupportedUdl, 2=SimplySupportedPointLoad, 3=EndMoments, 4=CantileverUdl
beta_m	number		Default: 0.
bf	number	yes
d	number	yes
e	number		Default: 200000.
fu	number		Default: 0.
fy	number	yes
iyy	number	yes
izz	number	yes
j	number	yes
leMajor	number	yes
leMinor	number	yes
mxStar	number	yes
myStar	number		Default: 0.
nStar	number	yes
syy	number		Default: 0.
szz	number		Default: 0.
tf	number	yes
tw	number	yes
vxStar	number		Default: 0.
zyy	number		Default: 0.
zzz	number		Default: 0.

WasmAs5100MemberResult

Used by as5100_member_check.

Field	Type	Required	Description
assumptions	WasmAs5100Assumptions	yes
governing	string	yes
phiMbx	number	yes
phiMby	number	yes
phiMsx	number	yes
phiMsy	number	yes
phiNcx	number	yes
phiNcy	number	yes
phiNt	number	yes
phiVv	number	yes
section_class	string	yes
utilAxial	number	yes
utilCombined	number	yes
utilFlexX	number	yes
utilFlexY	number	yes
utilMax	number	yes
utilShear	number	yes

WasmAsce7CpResult

Used by asce7_roof_pressure_coefficient, asce7_wall_pressure_coefficient.

Field	Type	Required	Description
c_p	number	yes
c_p_b	number | null		Design case B where Fig. 27.3-1 gives a second one; null when it does not. BOTH cases must be checked - B is often a downward pressure and governs different members from A.
clause	string	yes
uses	string	yes	"q_z" (point height, windward wall only) or "q_h" (mean roof height, everything else). The figure chooses this, not the caller.

WasmAsce7RoofCpInput

Used by asce7_roof_pressure_coefficient.

Field	Type	Required	Description
dist_from_windward_edge_over_h	number		Distance from the windward edge divided by h. Used by the parallel-to-ridge case, which zones the roof by distance rather than by slope. Default: 0.
face	string	yes	"windward", "leeward" or "parallel" (wind parallel to the ridge).
h_over_l	number	yes	h/L - mean roof height over the plan dimension along the wind.
theta_deg	number	yes	Roof angle theta, degrees from horizontal.

WasmAsce7SurfacePressureInput

Used by asce7_surface_pressure.

Field	Type	Required	Description
c_p	number	yes
g	number	yes	Gust-effect factor G, Section 26.11. NO DEFAULT: 0.85 is the rigid-building value and this build does not classify a model as rigid or flexible, so it must be supplied.
q_h_pa	number	yes	q_h, Pa - the velocity pressure at mean roof height.
q_z_pa	number	yes	q_z, Pa - the velocity pressure at the height of the point considered.
uses	string	yes	"q_z" or "q_h" - which velocity pressure the figure sends to this surface. Take it from the uses field of the coefficient call rather than choosing it.

WasmAsce7SurfacePressureResult

Used by asce7_surface_pressure.

Field	Type	Required	Description
c_p	number	yes
clause	string	yes
g	number	yes
p_pa	number	yes	p = q G C_p, Pa. Positive acts toward the surface, negative away from it.
q_source	string	yes
q_used_pa	number	yes

WasmAsce7VelocityPressureInput

Used by asce7_velocity_pressure.

Field	Type	Required	Description
basic_wind_speed_ms	number	yes	Basic wind speed V, m/s (Section 26.5 hazard maps).
exposure	string	yes	Exposure category letter: "B", "C" or "D" (Section 26.7).
ground_elevation_m	number		Ground elevation above mean sea level, m, for K_e. NOT the terrain gradient height. Default: 0.
k_d	number	yes	Wind directionality factor K_d, Table 26.6-1. 0.85 for buildings.
k_zt	number		Topographic factor K_zt, Section 26.8.2. 1.0 on flat terrain. Default: 1.
z_m	number	yes	Height above ground, m.

WasmAsce7VelocityPressureResult

Used by asce7_velocity_pressure.

Field	Type	Required	Description
clause	string	yes
k_d	number	yes
k_e	number	yes
k_z	number	yes
k_zt	number	yes
q_pa	number	yes
z_used_m	number	yes

WasmAsce7WallCpInput

Used by asce7_wall_pressure_coefficient.

Field	Type	Required	Description
face	string	yes	"windward", "side" or "leeward".
l_over_b	number	yes	L/B - plan dimension along the wind over the dimension across it.

WasmAutoSizeCandidate

A catalogue candidate: a serialized section plus its catalogue mass + design group. name comes from the flattened WasmSection.

Field	Type	Required	Description
a	number	yes
bf	number		Default: 0.
category	string	yes
cold_formed	boolean		Default: false.
d	number		Default: 0.
fy	number		Default: 0.
id	integer	yes
iw	number		Default: 0.
iyy	number	yes
izz	number	yes
j	number	yes
lip	number		Default: 0.
mass_kg_m	number	yes
name	string		Default: "".
syy	number		Default: 0.
szz	number		Default: 0.
tf	number		Default: 0.
tw	number		Default: 0.
x0	number		Default: 0.
zyy	number		Default: 0.
zzz	number		Default: 0.

WasmAutoSizeInput

Used by auto_size.

Field	Type	Required	Description
candidates	{ [key]: WasmAutoSizeCandidate[] }
model	WasmModel	yes
options	WasmAutoSizeOptions
sizable	WasmSizableSpec[]

WasmAutoSizeOptions

Field	Type	Required	Description
max_iter	integer		Default: 8.
target	number		Default: 1.

WasmAxisCapacity

Field	Type	Required	Description
Ze	number	yes
compactness	WasmAxisCompactness	yes
phiMb	number	yes
phiMs	number	yes

WasmAxisCompactness

Field	Type	Required	Description
class	string	yes
flange	WasmPlateCompactness	yes
web	WasmPlateCompactness	yes

WasmBasePlateAssumptions

Field	Type	Required	Description
method	string	yes
phi_concrete	number	yes
phi_steel	number	yes

WasmBasePlateInput

Used by base_plate_check.

Field	Type	Required	Description
bolt_count	integer		Default: 0.
bolt_diameter	number		Default: 0.
bolt_grade	string		Default: "".
column_bf	number	yes
column_d	number	yes
concrete_fc	number	yes
n_star	number	yes
plate_b	number	yes
plate_d	number	yes
plate_fy	number	yes
plate_t	number	yes
v_star	number		Default: 0.

WasmBasePlateResult

Used by base_plate_check.

Field	Type	Required	Description
assumptions	WasmBasePlateAssumptions	yes
bearing_pressure	number	yes
cantilever_b	number	yes
cantilever_d	number	yes
confinement	number	yes
n_star	number	yes
phiAnchorShear	number	yes
phiNcConc	number	yes
phiPlateBending	number	yes
t_req	number	yes
util_anchor_shear	number	yes
util_bearing	number	yes
util_bolts	number	yes
util_interaction	number	yes
util_max	number	yes
util_plate	number	yes

WasmBearingStiffenerInput

Used by bearing_stiffener_check.

Load-bearing web stiffener pair (conn_stiffener::bearing_stiffener_capacity). SI in; mm/MPa inside.

Field	Type	Required	Description
b_es	number	yes
d_1	number	yes
f_y	number	yes
f_ys	number	yes
r_star	number	yes
t_f	number	yes
t_s	number	yes
t_w	number	yes

WasmBearingStiffenerResult

Used by bearing_stiffener_check.

Field	Type	Required	Description
alphaC	number	yes
lambdaN	number	yes
outstandRatio	number	yes
phiRsb	number	yes
phiRsy	number	yes
r_star	number	yes
util_max	number	yes
util_stiffener_buckling	number	yes
util_stiffener_yield	number	yes

WasmBoltGroupInput

Used by eccentric_bolt_group_check.

Field	Type	Required	Description
boltDiameter	number	yes
boltGrade	string	yes
bolts	WasmBoltPositionInput[]	yes
kr	number	yes
mz	number	yes
nN	integer	yes
nX	integer	yes
vx	number	yes
vy	number	yes

WasmBoltGroupResult

Used by eccentric_bolt_group_check.

Field	Type	Required	Description
governingBolt	integer	yes
phiVbolt	number	yes
phiVtotal	number	yes
util_max	number	yes
vResultantGov	number	yes

WasmBoltInput

Used by bolt_capacity.

Field	Type	Required	Description
bolt_diameter	number	yes
bolt_grade	string	yes
kr	number		Default: 1.
ply_fu	number		Default: 0.
ply_thickness	number		Default: 0.
shear_planes_threads_excluded	integer	yes
shear_planes_threads_intercepted	integer	yes

WasmBoltLayout

Used by bolt_layout.

Field	Type	Required	Description
cols	integer	yes
edge	number	yes
end	number	yes
fits	boolean	yes
gauge	number	yes
pitch	number	yes
plateH	number	yes
plateW	number	yes
positions	WasmBoltPos[]	yes
rows	integer	yes
trace	string[]	yes

WasmBoltLayoutInput

Used by bolt_layout.

Field	Type	Required	Description
availWidth	number	yes
boltDiameter	number	yes
count	integer	yes
edge	number | null		Default: null.
edgeType	string		Default: "".
end	number | null		Default: null.
gauge	number | null		Default: null.
pitch	number | null		Default: null.

WasmBoltPos

Field	Type	Required	Description
x	number	yes
y	number	yes

WasmBoltPositionInput

Field	Type	Required	Description
x	number	yes
y	number	yes

WasmBoltResult

Used by bolt_capacity.

Field	Type	Required	Description
minEdge	number	yes
minGauge	number	yes
minPitch	number	yes
phiNtf	number	yes
phiVb	number	yes
phiVf	number	yes

WasmBridgingInput

Used by bridging_check.

Purlin bridging bracket (conn_bridging.rs). SI in (m, Pa, N); the core works in mm and MPa. The detail the source documents: two M12 through the purlin WEB into a formed end bracket on the bridging member (Stramit PGB-DI). leg is the bracket's leg - the offset from the bolt line to the bridging member's own axis - and it is what the bracket bends under.

Field	Type	Required	Description
bolt_count	integer	yes
bolt_dia	number	yes
bolt_grade	string	yes
bracket_b	number	yes
bracket_fu	number	yes
bracket_fy	number	yes
bracket_t	number	yes
gauge	number	yes	The bolt line's gauge: the spacing of the bolts up the purlin's web.
leg	number		The bracket's leg: how far the bridging member's axis sits off the bolt line. Default: 0.
m_star	number		Default: 0.
n_star	number	yes
v_star	number	yes
web_fu	number	yes
web_t	number	yes

WasmBridgingResult

Used by bridging_check.

Field	Type	Required	Description
bearingC	number	yes
components	WasmConnComponent[]	yes
govComponent	string	yes
govUtil	number	yes
notes	string[]	yes
status	string	yes

WasmBucklingMode

Field	Type	Required	Description
index	integer	yes
load_factor	number	yes
mode_shape	WasmNodeDisplacement[]	yes

WasmBucklingResults

Used by solve_model_buckling.

Field	Type	Required	Description
modes	WasmBucklingMode[]	yes
warnings	string[]		Eigensolver self-check notes (Sturm-count mismatch). Non-empty means the mode set is suspect and the UI must show it.

WasmCable

Field	Type	Required	Description
member_id	integer	yes
model	string		Default: "".
unstressed_length	number | null		Default: null.

WasmCapacityAssumptions

Field	Type	Required	Description
alpha_b	number	yes
alpha_m	number	yes
alpha_s	number	yes
kl	number	yes
kr	number	yes
kt	number	yes
le_x	number	yes
le_y	number	yes

WasmColumnSideInput

Used by column_side_check.

Field	Type	Required	Description
beamD	number	yes
beamTf	number	yes
bfCol	number		The column flange width, m. Default: 0.
bothFlangesRestrained	boolean		Both column flanges are held at the joint (Cl 5.13.4 slenderness 2.5 d1/tw, else 5.0). Default: false.
dCol	number	yes
flangeInTstub	boolean		The column flange is already checked as bolted T-stubs, so the flange yield line row is left out. Default: false.
flangeWeldLeg	number		The beam flange's fillet weld leg to the column, m (0 for a butt weld or none). Default: 0.
fyCol	number	yes
mStar	number	yes
nStar	number		Default: 0.
plateT	number		The end plate's thickness, m (0 on a welded joint). Default: 0.
stiffenerFy	number		The continuity stiffeners' yield stress, Pa. Default: 0.
stiffenerT	number		The continuity stiffeners' thickness, m (0 when none are drawn). Default: 0.
tfCol	number	yes
twCol	number	yes

WasmColumnSideResult

Used by column_side_check.

Field	Type	Required	Description
components	WasmConnComponent[]	yes
govComponent	string	yes
govUtil	number	yes
notes	string[]	yes
status	string	yes
stiffenersRequired	boolean	yes

WasmCombinationResults

Results output

Field	Type	Required	Description
combination_id	integer	yes
displacements	WasmNodeDisplacement[]	yes
member_forces	WasmMemberForce[]	yes
member_station_forces	WasmMemberStationForces[]	yes
name	string	yes
reactions	WasmReaction[]	yes

WasmCombinedColumn

Field	Type	Required	Description
bx	number	yes
by	number	yes
mxService	number		Default: 0.
mxStar	number		Default: 0.
myService	number		Default: 0.
myStar	number		Default: 0.
nService	number		Default: 0.
nStar	number	yes
x	number	yes

WasmCombinedFootingInput

Used by combined_footing_design.

Field	Type	Required	Description
barDiameter	number		Default: 0.
bearingBasis	string		Default: "allowable".
columns	WasmCombinedColumn[]	yes
cover	number	yes
fPrimeC	number	yes
fPrimeCColumn	number		Default: 0.
fSy	number	yes
footingBx	number	yes
footingBy	number	yes
footingH	number	yes
qBearing	number	yes
selfWeight	number		Default: 0.
standard	FootingCode		Default: "as3600".

WasmCombinedFootingResult

Used by combined_footing_design.

Field	Type	Required	Description
aStBottomReq	number	yes
aStMin	number	yes
aStTopReq	number	yes
aStTransverseReq	number	yes
checksRefused	string[]	yes
contactState	string	yes
governing	string	yes
mHog	number	yes
mSag	number	yes
mTransverse	number	yes
note	string | null
phiVPunch	number	yes
phiVUc	number	yes
qAllowable	number	yes
qMax	number	yes
resultantX	number	yes
utilBearing	number	yes
utilBearingStress	number	yes
utilDevelopment	number	yes
utilMax	number	yes
utilMoment	number	yes
utilPunching	number	yes
utilShear	number	yes
utilTransverse	number	yes
vDesign	number	yes
vPunch	number	yes

WasmComboGenInput

Used by generate_load_combinations.

Field	Type	Required	Description
code	string		Which code's combination set: "asnzs" (default) | "asce7" | "eurocode". Default: "".
load_cases	WasmLoadCase[]	yes
occupancy	string | null		AS/NZS 1170.0 Table 4.1 occupancy: resolves psi_s/psi_l/psi_c/psi_e at once. Overridden per-field by any of the explicit psi_* fields above. Default: null.
psi0_q	number | null		Default: null.
psi0_s	number | null		Default: null.
psi0_w	number | null		Default: null.
psi1_q	number | null		Default: null.
psi2_q	number | null		Default: null.
psi_c	number | null		Default: null.
psi_e	number | null		AS/NZS 1170.0 Table 4.1 earthquake combination factor. Default: null.
psi_l	number | null		Default: null.
psi_s	number | null		Default: null.

WasmComboGenOutput

Used by generate_load_combinations.

Field	Type	Required	Description
combinations	WasmLoadCombination[]	yes

WasmComboTerm

Field	Type	Required	Description
factor	number	yes
load_case_id	integer	yes

WasmCompositeBeamInput

Used by composite_beam_check.

Field	Type	Required	Description
b_f	number	yes
beam_spacing	number	yes
d	number	yes
d_s	number	yes
d_stud	number	yes
f_prime_c	number	yes
f_u_stud	number	yes
f_y	number	yes
m_star	number	yes
n_studs	integer	yes
span	number	yes
t_f	number	yes
t_w	number	yes
z_e	number	yes

WasmCompositeBeamResult

Used by composite_beam_check.

Field	Type	Required	Description
bEff	number	yes
eta	number	yes
fCc	number	yes
fSt	number	yes
mBare	number	yes
mFull	number	yes
nStudsReq	number	yes
phiMbv	number	yes
phiNQ	number	yes
pnaInSlab	boolean	yes
util_max	number	yes
util_moment	number	yes
util_stud	number	yes

WasmCompressionCapacity

Field	Type	Required	Description
Ns	number	yes
alpha_c	number	yes
kf	number	yes
lambda_n	number	yes
phiNcx	number	yes
phiNcy	number	yes

WasmConnComponent

One limit-state row on the wire: {name, clause, demand, capacity, util, status}.

Field	Type	Required	Description
capacity	number	yes
clause	string	yes
demand	number	yes
name	string	yes
status	string	yes
util	number	yes

WasmConnStiffenerComponent

Field	Type	Required	Description
capacity	number	yes
clause	string	yes
demand	number	yes
name	string	yes
status	string	yes
util	number	yes

WasmConnStiffenerInput

Used by conn_stiffener_check.

Field	Type	Required	Description
b_col	number	yes
d_col	number	yes
flange_bending_util	number	yes
flange_force	number	yes
fy_col	number	yes
fy_stiffener	number	yes
panel_shear_util	number	yes
tf_col	number	yes
tw_col	number	yes
web_bearing_util	number	yes

WasmConnStiffenerResult

Used by conn_stiffener_check.

Field	Type	Required	Description
components	WasmConnStiffenerComponent[]	yes
continuity_plate_area_req	number	yes
continuity_plate_thickness_min	number	yes
doubler_area_req	number	yes
doubler_thickness_min	number	yes
flange_force	number	yes
status	string	yes
stiffeners_required	boolean	yes

WasmContinuousInfluenceLineInput

Used by influence_line_continuous.

Field	Type	Required	Description
action	string	yes
member_ids	integer[]	yes
model	WasmModel	yes
n_points	integer		Default: 101.
station_local_x	number	yes
station_member	integer	yes
support_node	integer		Default: 0.

WasmContinuousInfluenceLineResult

Used by influence_line_continuous.

Field	Type	Required	Description
action	string	yes
ordinates	number[]	yes
positions	number[]	yes
station_local_x	number	yes
station_member	integer	yes
support_reaction_node	integer | null
total_length	number	yes

WasmCraneInput

Used by en1991_3_crane.

Field	Type	Required	Description
bridge_weight_kn	number	yes
buffer_stiffness_kn_m	number		Default: 0.
buffer_xi	number		Default: 0.5.
crab_weight_kn	number		Default: 0.
driven_wheels	integer		Default: 2.
fatigue_class	integer | null		Default: null.
friction	number		Default: 0.2.
guide_spacing_m	number		Default: 0.
hoist_load_kn	number	yes
hoisting_class	integer		Default: 2.
hoisting_speed_ms	number		Default: 0.1.
min_approach_m	number		Default: 1.
phi_5	number		Default: 1.5.
skew_angle_rad	number		Default: 0.015.
span_m	number	yes
travel_speed_ms	number		Default: 0.
wheel_pair_distances_m	number[]		Default: [].
wheel_spacings_m	number[]		Default: [3].
wheels_per_rail	integer		Default: 2.

WasmDiaphragm

Rigid in-plane diaphragm: node ids tied to move as one rigid body in the horizontal plane.

Field	Type	Required	Description
id	integer	yes
node_ids	integer[]	yes

WasmDirectThInput

Used by solve_model_time_history_direct.

Input for solve_model_time_history_direct (ADR 0013 Step 3): the modal path's input plus the scheme and the damping form. scheme is "newmark" (with beta, gamma, default average acceleration) or "hht" (with alpha in OpenSees's convention, default 0.9). Damping is rayleigh: [a0, a1] when given, else damping_ratio fitted at the first two modes.

Field	Type	Required	Description
alpha	number | null		Default: null.
beta	number | null		Default: null.
damping_ratio	number		Default: 0.05.
direction	number[]		Default: [1,0,0].
gamma	number | null		Default: null.
model	WasmModel	yes
nonlinear	boolean		Default: false.
rayleigh	number[] | null		Default: null.
record	number[][]	yes
scheme	string		Default: "".
track_node	integer | null		Default: null.

WasmDynamicFloorInput

Used by as1170_dynamic_base_shear_floor.

Input for as1170_dynamic_base_shear_floor: the seismic site inputs the equivalent-static base shear needs, plus the dynamic analysis's own base shear and the seismic weight it acted on.

Field	Type	Required	Description
annual_probability	number | null		Default: null.
height_m	number	yes
kt	number | null		Eq 6.2(7) inputs: kt and the structure height hn, metres. Default: null.
location	string | null		Default: null.
mu	number | null		Default: null.
soil	string		Default: "".
sp	number | null		Default: null.
system	string | null		Default: null.
v_dynamic	number	yes	The base shear the dynamic analysis produced, newtons.
weight	number	yes	Seismic weight Wt, newtons - the same mass the dynamic analysis used.
z	number | null		Default: null.

WasmEc1PeakVelocityPressureInput

Used by ec1_peak_velocity_pressure.

AS/NZS 1170.3:2003 snow actions: the ground snow load for the site (Section 5), the exposure coefficient (Cl 4.2.2), and the roof load cases for a mono- or duo-pitched roof (Sections 6 and 7), with the edge overhang load of Cl 4.2.3.

Field	Type	Required	Description
c_0	number		Orography factor c_0(z). 1.0 where orography is not significant. Default: 1.
k_i	number		Turbulence factor k_I. A National Annex parameter; the EN recommends 1.0. Default: 1.
rho_kg_m3	number		Air density, kg/m3. A NATIONAL ANNEX parameter; the EN recommends 1.25. Default: 1.25.
terrain	string	yes	Terrain category label: "0", "I", "II", "III" or "IV" (Table 4.1).
v_b_ms	number	yes	Basic wind velocity v_b, m/s, from the national map (Section 4.2).
z_m	number	yes	Height above ground, m.

WasmEc1PeakVelocityPressureResult

Used by ec1_peak_velocity_pressure.

Field	Type	Required	Description
c_0	number	yes
c_e	number	yes	q_p / q_b, EN's exposure factor c_e(z) - the number an engineer recognises at a glance.
c_r	number	yes
clause	string	yes
i_v	number	yes
q_b_pa	number	yes
q_p_pa	number	yes
v_m_ms	number	yes
z_used_m	number	yes

WasmEc3Assumptions

Field	Type	Required	Description
c1	number	yes
curveLT	string	yes
curveY	string	yes
curveZ	string	yes
lcrLT	number	yes
lcrY	number	yes
lcrZ	number	yes

WasmEc3MemberInput

Used by ec3_member_check.

Field	Type	Required	Description
a	number	yes
bf	number	yes
c1	number		Default: 0.
d	number	yes
e	number		Default: 0.
fy	number	yes
iyy	number	yes
izz	number	yes
j	number	yes
lcrLT	number	yes
lcrY	number	yes
lcrZ	number	yes
myStar	number	yes
mzStar	number	yes
nStar	number	yes
name	string		Section name (optional): picks the Cl 6.2.6(3) shear area by shape (I, channel, RHS, CHS). Default: "".
r	number		Root radius (m, optional): the fillets' part of the rolled-section shear area. Default: 0.
szz	number		Default: 0.
tf	number	yes
tw	number	yes
vyStar	number	yes
w_el_y	number		Default: 0.
w_pl_y	number		Default: 0.
zzz	number		Default: 0.

WasmEc3MemberResult

Used by ec3_member_check.

Field	Type	Required	Description
MbRd	number	yes
MyRd	number	yes
MzRd	number	yes
NbYRd	number	yes
NbZRd	number	yes
NcRd	number	yes
NtRd	number	yes
VplRd	number	yes
assumptions	WasmEc3Assumptions	yes
governing	string	yes
section_class	string	yes
utilAxial	number	yes
utilCombined	number	yes
utilFlexY	number	yes
utilFlexZ	number	yes
utilMax	number	yes
utilShear	number	yes

WasmEndGap

Field	Type	Required	Description
gap_mm	number	yes
member_id	integer	yes

WasmEndPlateDrawnRow

Field	Type	Required	Description
bolts	integer	yes
y	number	yes

WasmEndPlateInput

Used by end_plate_check.

Field	Type	Required	Description
beam_bf	number		Default: 0.
beam_d	number	yes
beam_fy	number		Default: 0.
beam_tf	number	yes
beam_tw	number		Default: 0.
bolt_count_tension	integer	yes
bolt_count_total	integer		Total bolts sharing the shear. 0 defaults to twice the tension count. Default: 0.
bolt_diameter	number	yes
bolt_grade	string	yes
both_directions	boolean		The moment's sign is not known in the joint frame: check with the tension at either flange (rows mirrored to beam_d - y) and report the worse. Default: false.
column_bf	number		Default: 0.
column_d	number		The column the plate bolts to (m, Pa; SA-118): with it the rows are also limited by the column flange as T-stubs and the column web in transverse tension. Default: 0.
column_fy	number		Default: 0.
column_r1	number		Default: 0.
column_stiffened	boolean		Continuity stiffeners opposite the tension flange (the web's tension is theirs). Default: false.
column_tf	number		Default: 0.
column_tw	number		Default: 0.
flange_weld_leg	number		Default: 0.
gauge	number		Centre-to-centre gauge of the two bolt columns (m). Default: 0.
m_star	number	yes
plate_ext	number		How far the plate runs past the tension flange's outer face (m); 0 for a flush plate. Default: 0.
plate_fy	number	yes
plate_thickness	number	yes
plate_width	number		Default: 0.
rows	WasmEndPlateDrawnRow[]		The drawn bolt rows (SA-87). When given, the plate is checked as AS 4100 T-stubs (connections::end_plate_tstub_as4100) instead of the strip model: each row's y (m) from the tension flange's outer face, positive towards the compression flange, and its bolt count. Default: [].
v_star	number		Coincident connection shear (N). Optional; 0 skips the Cl 9.2.2.3 combined shear + tension interaction on the tension bolts. Default: 0.
web_weld_leg	number		Default: 0.

WasmEndPlateMultiRowInput

Used by end_plate_moment_multirow_check.

Field	Type	Required	Description
bolt_diameter	number	yes
bolt_grade	string	yes
fc_rd	number	yes
plate_fy	number	yes
plate_thickness	number	yes
plate_width	number	yes
rows	WasmEndPlateRowInput[]	yes

WasmEndPlateMultiRowResult

Used by end_plate_moment_multirow_check.

Field	Type	Required	Description
fc_rd	number	yes
m_rd	number	yes
notes	string[]	yes
rows	WasmEndPlateRowResult[]	yes
total_tension	number	yes

WasmEndPlateResult

Used by end_plate_check.

Field	Type	Required	Description
columnInTstub	boolean		The column flange and web in tension were in the T-stub rows (SA-118). Default: false.
d_eff	number	yes
governing	string		Default: "".
m_star	number	yes
method	string		"tstub" (the drawn rows, AS 4100 T-stubs) or "strip" (no rows given: the plate as one strip). Default: "".
notes	string[]		Default: [].
phiBoltsTension	number	yes
phiMDes	number	yes
phiPlateBending	number	yes
row_capacity	number[]		Default: [].
row_modes	string[]		Per tension row: governing T-stub mode and its capacity (N), top row first. Default: [].
tStar	number	yes
utilWebWeld	number		The web welds to the plate under the shear and the rows' tension, Cl 9.6.3.10 (SA-119). Default: 0.
util_bolt_combined	number	yes
util_bolts	number	yes
util_max	number	yes
util_plate	number	yes

WasmEndPlateRowInput

Field	Type	Required	Description
bolts	integer	yes
kind	WasmEndPlateRowKindInput	yes
lever_arm	number	yes

WasmEndPlateRowKindInput

One of:

• type: "extended"

  Field	Type	Required	Description
  e	number	yes
  ex	number	yes
  mx	number	yes
  type	"extended"	yes

• type: "first_below_flange"

  Field	Type	Required	Description
  e	number	yes
  m	number	yes
  m2	number	yes
  type	"first_below_flange"	yes

• type: "inner"

  Field	Type	Required	Description
  e	number	yes
  m	number	yes
  type	"inner"	yes

• type: "end"

  Field	Type	Required	Description
  e	number	yes
  m	number	yes
  type	"end"	yes

WasmEndPlateRowResult

Field	Type	Required	Description
ft_rd	number	yes
leff_1	number	yes
leff_2	number	yes
mode	string	yes

WasmEnvelopeResults

Field	Type	Required	Description
displacements_max	WasmNodeDisplacement[]	yes
displacements_min	WasmNodeDisplacement[]	yes
member_forces_max	WasmMemberForce[]	yes
member_forces_min	WasmMemberForce[]	yes
reactions_max	WasmReaction[]	yes
reactions_min	WasmReaction[]	yes

WasmFinPlateInput

Used by fin_plate_check.

Field	Type	Required	Description
bolt_columns	integer		Default: 0.
bolt_count	integer	yes
bolt_diameter	number	yes
bolt_grade	string	yes
edge_distance	number		Default: 0.
end_distance	number		Default: 0.
gauge	number		Default: 0.
pitch	number		Default: 0.
plate_depth	number	yes
plate_fu	number	yes
plate_fy	number	yes
plate_thickness	number	yes
v_star	number	yes
weld_fuw	number		Default: 480000000.
weld_leg_size	number	yes
weld_length	number	yes

WasmFinPlateResult

Used by fin_plate_check.

Field	Type	Required	Description
phiBlockShear	number	yes
phiBolts	number	yes
phiPlateBearing	number	yes
phiPlateShear	number	yes
phiPlateTearout	number	yes
phiVDes	number	yes
phiWeld	number	yes
util_block_shear	number	yes
util_bolts	number	yes
util_max	number	yes
util_plate_bearing	number	yes
util_plate_shear	number	yes
util_plate_tearout	number	yes
util_weld	number	yes
v_star	number	yes

WasmFloorVibrationInput

Used by p354_floor_vibration.

{ modes: [{ frequency_hz, modal_mass_kg, mu_e, mu_r }], damping_ratio | damping: "furnished", weighting: "Wb"|"Wg"|"Wd", cutoff_hz | floor: "general"|"enclosed"|"staircase", pace_min_hz, pace_max_hz, person_weight_n, walking_path_m, limit, vertical }

Field	Type	Required	Description
cutoff_hz	number | null		Default: null.
damping	string		Default: "".
damping_ratio	number | null		Default: null.
floor	string		Default: "".
limit	number		Default: 8.
modes	FloorMode[]	yes
pace_max_hz	number		Default: 2.2.
pace_min_hz	number		Default: 1.8.
person_weight_n	number		Default: 746.
vertical	boolean		Default: true.
walking_path_m	number | null		Default: null.
weighting	string		Default: "".

WasmFootingFeInput

Used by footing_fe_pressure.

Field	Type	Required	Description
bx	number	yes
by	number	yes
cx	number		Default: 0.4.
cy	number		Default: 0.4.
e_concrete	number		Default: 30000000000.
ks	number	yes
mx	number		Default: 0.
my	number		Default: 0.
n	number	yes
nu	number		Default: 0.2.
nx	integer		Default: 12.
ny	integer		Default: 12.
self_weight	number		Default: 0.
thickness	number	yes

WasmFootingSizeInput

Used by footing_size_for_bearing.

Field	Type	Required	Description
aspect	number		by/bx. Defaults to 1.0 (square). Default: 0.
footingH	number		Footing thickness, m, so self-weight can grow with the plan area inside the loop. Default: 0.
mxService	number		Default: 0.
myService	number		Default: 0.
nService	number	yes	Unfactored vertical load, kN. Bearing is a working-stress check.
qAllowable	number	yes	Allowable bearing pressure, kPa. Already factored if the caller's basis was "ultimate".

WasmFootingSizeResult

Used by footing_size_for_bearing.

Field	Type	Required	Description
bx	number	yes
by	number	yes
converged	boolean	yes
note	string | null
qMax	number	yes
util	number	yes

WasmGeoClassifyInput

Used by geo_classify_point.

Field	Type	Required	Description
point	number[]	yes	Query point [lon, lat].
polygons	GeoPolygon[]		Candidate polygons (name, optional class attribute, GeoJSON rings). Default: [].

WasmGradeBeamColumn

Field	Type	Required	Description
nStar	number	yes
x	number	yes

WasmGradeBeamInput

Used by grade_beam_design.

Field	Type	Required	Description
columns	WasmGradeBeamColumn[]	yes
cover	number	yes
fPrimeC	number	yes
fSy	number	yes
ks	number	yes	Modulus of subgrade reaction, N/m^3. Geotechnical; no default - see grade_beam.rs.
length	number	yes
nElements	integer		Default: 0.
standard	FootingCode		Concrete design code for the longitudinal flexure design. Omitted -> AS 3600, so a payload without a standard designs exactly as before. Default: "as3600".
thickness	number	yes
width	number	yes

WasmGradeBeamResult

Used by grade_beam_design.

Field	Type	Required	Description
aStBottomReq	number	yes
aStMin	number	yes
aStTopReq	number	yes
checksRefused	string[]	yes
lambdaL	number	yes
mHog	number	yes
mSag	number	yes
note	string | null
qMax	number	yes
qMaxAt	number	yes
rigidity	string	yes
settlementMax	number	yes
utilMoment	number	yes
vMax	number	yes

WasmGussetInput

Used by gusset_check.

Field	Type	Required	Description
alphaB	number		Default: 0.5.
boltDiameter	number	yes
count	integer	yes
edgeType	string		Default: "".
grade	string		Default: "8.8".
k	number		Default: 0.65.
lb	number		Default: 0.12.
memberWidth	number	yes
nShearPlanes	integer		Default: 1.
nStar	number	yes
plateFu	number	yes
plateFy	number	yes
plateThickness	number	yes

WasmGussetResult

Used by gusset_check.

Field	Type	Required	Description
components	WasmConnComponent[]	yes
govComponent	string	yes
govUtil	number	yes
layout	WasmBoltLayout	yes
notes	string[]	yes
status	string	yes

WasmGussetSupportInput

Used by gusset_support_check.

A gusset's bolted support fitting (conn_gusset_support). SI in; mm/MPa inside.

Field	Type	Required	Description
bolt_dia	number	yes
bolt_grade	string	yes
bolted_plate	boolean	yes
cols	integer	yes
f_par	number	yes
f_perp	number	yes
gusset_bolts	integer	yes
lever	number	yes
m_star	number	yes
pitch	number	yes
plate_fy	number	yes
plate_t	number	yes
ply_fu	number	yes
ply_t	number	yes
rows	integer	yes
strip	number	yes
weld_leg	number	yes
weld_len	number	yes

WasmGussetSupportResult

Used by gusset_support_check.

Field	Type	Required	Description
f_par	number	yes
f_perp	number	yes
tOuter	number	yes
util_face_bolts	number	yes
util_gusset_bolts	number	yes
util_gusset_weld	number	yes
util_max	number	yes
util_plate_bending	number	yes
util_ply_bearing	number	yes

WasmHollowBraceEndInput

Used by hollow_brace_end_check.

Hollow-section brace end on a gusset (conn_hollow_brace.rs). SI in (m, Pa, N); the core works in mm and MPa.

Field	Type	Required	Description
bolt_columns	integer		Default: 1.
bolt_count	integer	yes
bolt_dia	number	yes
bolt_grade	string	yes
n_star	number	yes
slotted	boolean		true: a tongue in a slotted tube; false: a lug on an end plate, the tube whole (plan A2b). Default: true.
tongue_end	number	yes
tongue_fu	number	yes
tongue_fy	number	yes
tongue_t	number	yes
tongue_w	number	yes
tube_d	number	yes
tube_fu	number	yes
tube_fy	number	yes
tube_t	number	yes
weld_leg	number	yes
weld_len	number	yes

WasmHollowBraceEndResult

Used by hollow_brace_end_check.

Field	Type	Required	Description
n_star	number	yes
phiBoltShear	number	yes
phiTongueBearing	number	yes
phiTongueFracture	number	yes
phiTongueTearout	number	yes
phiTongueYield	number	yes
phiTubeNet	number	yes
phiWeld	number	yes
shearLagU	number	yes
util_bolt_shear	number	yes
util_max	number	yes
util_tongue	number	yes
util_tongue_bearing	number	yes
util_tube	number	yes
util_weld	number	yes

WasmImposedInput

Used by as1170_1_imposed.

Field	Type	Required	Description
category	string	yes
use	string		Default: "".

WasmInfluenceLineInput

Used by influence_line.

Field	Type	Required	Description
action	string	yes
n_points	integer		Default: 101.
span	number	yes
station	number	yes
support_type	string	yes

WasmInfluenceLineResult

Used by influence_line.

Field	Type	Required	Description
action	string	yes
ordinates	number[]	yes
positions	number[]	yes
span	number	yes
station	number	yes
support	string	yes

WasmLapInput

Used by lap_check.

Cold-formed lap splice (conn_lap.rs). SI in (m, Pa, N); the core works in mm and MPa.

Field	Type	Required	Description
bolt_count	integer	yes
bolt_dia	number	yes
bolt_grade	string	yes
eccentricity	number		The ply standoff: how far the bolt line sits off the member's own axis. Default: 0.
m_star	number		Default: 0.
n_star	number	yes
pitch	number	yes
ply1_fu	number	yes
ply1_t	number	yes
ply2_fu	number	yes
ply2_t	number	yes
v_star	number	yes

WasmLapResult

Used by lap_check.

Field	Type	Required	Description
bearingC	number	yes
components	WasmConnComponent[]	yes
govComponent	string	yes
govUtil	number	yes
kr	number	yes
lapLength	number	yes
notes	string[]	yes
status	string	yes

WasmLoadCase

Field	Type	Required	Description
id	integer	yes
load_case_type	integer		0=Dead, 1=Live, 2=Wind, 3=Seismic, 4=Snow, 5=Other, 6=WindUltimate, 7=WindServiceability, 8=SeismicServiceability Default: 0.
name	string	yes
self_weight_factor	number		Default: 0.

WasmLoadCaseResults

Field	Type	Required	Description
capacity_warnings	string[]		Members the selected design code could not check (unsupported section type/class) - a missing capacity record means NOT CHECKED, never OK.
deactivated	integer[]		Members deactivated by the tension/compression-only iteration for this case: zero force, no capacity row, and THIS is what says so.
displacements	WasmNodeDisplacement[]	yes
load_case_id	integer	yes
member_capacities	WasmMemberCapacity[]		Default: [].
member_forces	WasmMemberForce[]	yes
member_station_forces	WasmMemberStationForces[]		Default: [].
plate_nodal_results	WasmPlateNodalResult[]
plate_nodal_results_smoothed	WasmPlateNodalResult[]
plate_notes	string[]		Information about the plates (orthotropy, compressed plates and the buckling analysis) - NOT a self-check; see AnalysisResults::plate_notes.
plate_results	WasmPlateResult[]		Default: [].
reactions	WasmReaction[]	yes
solver_warnings	string[]		Numerical self-checks on the solve (equilibrium residual). Non-empty means the displacement solution itself is suspect - surface it.

WasmLoadCombination

Field	Type	Required	Description
id	integer	yes
name	string	yes
terms	WasmComboTerm[]	yes	List of { load_case_id, factor } terms

WasmMaterial

Field	Type	Required	Description
alpha	number		Default: 0.000012.
e	number	yes
fu	number		Default: 400000000.
fy	number		Default: 250000000.
g	number	yes
id	integer	yes
name	string		Default: "".
nu	number		Default: 0.3.
rho	number		Default: 7850.

WasmMember

Field	Type	Required	Description
beta	number	yes
fixity_a	integer		Default: 0.
fixity_b	integer		Default: 0.
flange_restrained	boolean		Compression flange continuously restrained (e.g. sheeting) -> no LTB. Defaults to false. Default: false.
id	integer	yes
ke_x	number		Effective-length factor for major-axis buckling / LTB. Defaults to 1.0. Default: 0.
ke_y	number		Effective-length factor for minor-axis compression buckling. Defaults to 1.0. Default: 0.
material_id	integer	yes
member_type	integer	yes
node_a	integer	yes
node_b	integer	yes
offset_a	number[]		Default: [0,0,0].
offset_b	number[]		Default: [0,0,0].
section_id	integer	yes

WasmMemberCapacitiesInput

Used by member_capacities_only.

Field	Type	Required	Description
member_forces	WasmMemberForce[]		Optional member forces for alpha_m / utilisation update. If provided, must contain one entry per member with solved end forces. Default: [].
model	WasmModel	yes

WasmMemberCapacitiesOutput

Used by member_capacities_only.

Field	Type	Required	Description
capacity_warnings	string[]		Members the selected design code could not check (unsupported section type/class) - one human-readable line each. The UI must surface these: a missing capacity record means NOT CHECKED, never OK.
member_capacities	WasmMemberCapacity[]	yes

WasmMemberCapacity

Field	Type	Required	Description
angle	AngleWorking | null		AS 4100 Cl 8.4.6 parts for a single angle truss member (SA-115); absent otherwise.
assumptions	WasmCapacityAssumptions	yes
axis_x	WasmAxisCapacity	yes
axis_y	WasmAxisCapacity	yes
code	string		Design code: "AS4100" (hot-rolled) or "AS4600" (cold-formed DSM). Default: "".
compression	WasmCompressionCapacity	yes
dsm	DsmCapacity | null		DSM mode breakdown (local/distortional/global) when code == "AS4600".
fy	number	yes
member_id	integer	yes
phi	number	yes
phiMox	number	yes
phiMoy	number	yes
phiMrx	number	yes	The axial-reduced moment capacities the two interactions above are formed from (N.m): section, Cl 8.3.2/8.3.3, and member out-of-plane, Cl 8.4.4. Without these the report can print the interaction formula but not one capacity inside it.
phiMry	number	yes
phiNt	number	yes
phiVv	number	yes
phiVvMinor	number		Minor-axis shear capacity (N), for Vz across the section's width (SA-39); 0 where the code path does not compute it. Default: 0.
utilBiaxialMember	number	yes
utilBiaxialSection	number	yes
utilMax	number	yes

WasmMemberForce

Field	Type	Required	Description
fx1	number	yes
fx2	number	yes
fy1	number	yes
fy2	number	yes
fz1	number	yes
fz2	number	yes
member_id	integer	yes
mx1	number	yes
mx2	number	yes
my1	number	yes
my2	number	yes
my_span	number		As mz_span, for |My| (minor axis). Default: 0.
mz1	number	yes
mz2	number	yes
mz_quarters	number[]		|Mz| at 0.25, 0.5 and 0.75 of the member, from its stations: with mz_span these are the four moments of AS 4100 Eq 5.6.1.1(2) / NZS 3404 Cl 5.6.1.1, so a check fed this row alone (auto-size's member_capacities_only) takes the same alpha_m the solve does. Zero when the row has no stations. Default: [0,0,0].
mz_span	number		The largest |Mz| (major axis) anywhere along the member, from its station forces, ends included. A simply supported beam's governing moment is at midspan, where both END moments are zero, and a design check that reads only mz1/mz2 calls a failing beam safe - which is what the Studio's per-member utilisation did until 2026-09-23 (SA-04). 0 when the row has no stations. Default: 0.

WasmMemberLoad

Field	Type	Required	Description
end_ratio	number		Default: 0.
load_case_id	integer	yes
load_type	integer		Default: 0.
member_id	integer	yes
qx	number	yes
qx2	number		Default: 0.
qy	number	yes
qy2	number		Default: 0.
qz	number	yes
qz2	number		Default: 0.
start_ratio	number		Default: 0.

WasmMemberStationForces

Field	Type	Required	Description
member_id	integer	yes
stations	WasmStationForce[]	yes

WasmModalInput

Used by solve_model_modal_with_options.

The input of solve_model_modal_with_options: the model and the modal options.

Field	Type	Required	Description
model	WasmModel	yes
options	WasmModalOptions		Default: {"mass_matrix":"","n_modes":0}.

WasmModalMode

Field	Type	Required	Description
eigenvalue	number	yes
frequency_hz	number	yes
index	integer	yes
modal_mass_kg	number		Modal mass (kg) for the unity-normalised shape (largest nodal translation = 1); SCI P354's M_n. Default: 0.
mode_shape	WasmNodeDisplacement[]	yes
unity_scale	number		Multiply a mode_shape translation by this to get the unity-normalised amplitude mu. Default: 1.

WasmModalOptions

Field	Type	Required	Description
mass_matrix	string		Default: "".
n_modes	integer		Default: 0.

WasmModalResults

Used by solve_model_modal.

Field	Type	Required	Description
modes	WasmModalMode[]	yes
warnings	string[]		Eigensolver self-check notes (Sturm-count mismatch, low seismic mass participation). Non-empty means the mode set is suspect.

WasmModel

Used by analysis_report, connection_takeoff, quantity_takeoff, solve_model, solve_model_buckling, solve_model_modal, solve_model_modal_with_options, solve_model_nonlinear, solve_model_nonlinear_3d, solve_model_nonlinear_with_options, solve_model_pdelta, solve_model_tc, validate_model.

Field	Type	Required	Description
cables	WasmCable[]		Per-cable-member settings for the 3D nonlinear path (ADR 0013 Step 1): which model ("chord" | "catenary") and the optional unstressed length in metres. Default: [].
design_code	string		Design code for member capacity checks: "AS4100" (default), "AISC360", "EC3". Default: "AS4100".
diaphragms	WasmDiaphragm[]		Default: [].
double_angle_connectors	DoubleAngleConnectors[]		Double-angle interconnectors (SA-156) - see model::DoubleAngleConnectors; the core type's own serde shape is the wire shape. Default: [].
end_gaps	WasmEndGap[]		Member-end gaps (ADR 0013 Step 2): { member_id, gap_mm } on truss / compression-only members. Default: [].
load_cases	WasmLoadCase[]	yes
load_combinations	WasmLoadCombination[]		Default: [].
materials	WasmMaterial[]	yes
member_loads	WasmMemberLoad[]	yes
members	WasmMember[]	yes
nodal_loads	WasmNodalLoad[]	yes
nodes	WasmNode[]	yes
plate_loads	WasmPlateLoad[]		Default: [].
plate_orthotropy	PlateOrthotropy[]		Orthotropic plates: { plate_id, axis: [x, y, z], input: { kind: "material", e1, e2, g12, nu12, g13, g23 } | { kind: "rigidities", a11, a22, a12, a66, d11, d22, d12, d66, s13, s23 } }. The core type's own serde shape is the wire shape; see model::PlateOrthotropy. Default: [].
plates	WasmPlate[]		Default: [].
sections	WasmSection[]	yes
shear_centre_loaded	integer[]		Member ids loaded at the shear centre rather than on the top flange (the default) - see model::Model::shear_centre_loaded. Default: [].

WasmModeResponse

Field	Type	Required	Description
baseShear	number	yes
effectiveMass	number	yes
frequencyHz	number	yes
modeIndex	integer	yes
participationFactor	number	yes
periodS	number	yes
spectralAccel	number	yes

WasmMomentBaseInput

Used by moment_base_check.

Field	Type	Required	Description
boltDiameter	number	yes
columnBf	number		Default: 0.
columnD	number	yes
concreteFc	number	yes
grade	string		Default: "8.8".
mStar	number	yes
nStar	number		Default: 0.
nTension	integer	yes
plateB	number	yes
plateD	number	yes
plateFy	number	yes
plateT	number	yes
vStar	number		Default: 0.

WasmMomentBaseResult

Used by moment_base_check.

Field	Type	Required	Description
anchorTension	number	yes
bearingLength	number	yes
components	WasmConnComponent[]	yes
govComponent	string	yes
govUtil	number	yes
notes	string[]	yes
status	string	yes

WasmMovingLoadInput

Used by moving_load_effect.

Field	Type	Required	Description
action	string	yes
n_points	integer	yes
span	number	yes
station	number	yes
support_type	string	yes
vehicle	WasmVehicle	yes

WasmMovingLoadResult

Used by moving_load_effect.

Field	Type	Required	Description
critical_position_max	number	yes
critical_position_min	number	yes
max_value	number	yes
min_value	number	yes

WasmNlOptions

Used by solve_model_nonlinear_3d, solve_model_nonlinear_with_options.

Options for solve_model_nonlinear_with_options (plan item 5). Every field has the default the planar solve always had; material: "plastic" turns on fibre sections with the material's own fy (or fy here, Pa) and control: "arc" traces past limit points.

Field	Type	Required	Description
control	string		Default: "".
ds	number | null
fibers	integer		Default: 16.
fy	number | null
hardening	number		Default: 0.
load_case_id	integer		Default: 0.
material	string		Default: "".
max_iterations	integer		Default: 60.
n_steps	integer		Default: 20.
tolerance	number		Default: 0.000001.

WasmNodalLoad

Field	Type	Required	Description
fx	number	yes
fy	number	yes
fz	number	yes
load_case_id	integer	yes
mx	number		Default: 0.
my	number		Default: 0.
mz	number		Default: 0.
node_id	integer	yes

WasmNode

Field	Type	Required	Description
id	integer	yes
mass	number		Default: 0.
restraint_flags	integer	yes
settlement	number[]		Default: [0,0,0,0,0,0].
spring_stiffness	number[]		Default: [0,0,0,0,0,0].
support_no_tension	boolean		Bears but cannot pull (ADR 0013 Step 2); honoured by the 3D nonlinear path only. Default: false.
x	number	yes
y	number	yes
z	number	yes

WasmNodeDisplacement

Field	Type	Required	Description
node_id	integer	yes
rx	number	yes
ry	number	yes
rz	number	yes
ux	number	yes
uy	number	yes
uz	number	yes

WasmNotionalInput

Used by as4100_notional_force.

Field	Type	Required	Description
adequately_braced	boolean		Legacy input from before the 2020 edition's single factor; accepted and ignored. Default: false.
multi_storey	boolean		AS 4100 Cl 3.2.4 applies to multi-storey buildings only. Default true. Default: true.
total_gravity_load	number	yes	Total design vertical load applied at the floor level (N).

WasmNotionalResult

Used by as4100_notional_force.

Field	Type	Required	Description
force	number	yes

WasmNzDesignCoefficientInput

Used by nzs1170_design_coefficient.

NZS 1170.5:2004 Cl 5.2.1.1: the ultimate limit state horizontal design action coefficient. sp (Cl 4.4) and mu (Cl 4.3) are caller inputs: Section 4 selects them from the structural system, which this module does not model. Everything else is the Section 3 spectrum this build already carries.

Field	Type	Required	Description
annual_probability	number	yes
mu	number	yes	Structural ductility factor mu, Cl 4.3.
n_max	number | null		Default: null.
near_fault_km	number | null		Default: null.
period	number	yes	T1, the largest translational period in the direction considered (Cl 4.1).
soil	string	yes
sp	number	yes	Structural performance factor Sp, Cl 4.4.
z	number	yes

WasmNzDesignCoefficientResult

Used by nzs1170_design_coefficient.

Field	Type	Required	Description
c_t	number	yes
cd	number	yes
cd_unfloored	number	yes
clause	string	yes
floor	number	yes
floor_governs	boolean	yes	True when Eq 5.2(2)'s floor decided the answer.
k_mu	number	yes
r	number	yes
r_capped	boolean	yes
sp	number	yes

WasmNzDesignSpectrumInput

Used by nzs1170_design_spectrum.

NZS 1170.5:2004 Eq 5.2(1)/(2) at EVERY period of Table 3.1: the inelastic design spectrum. A COMPOSITION of the single-period path, so there is one implementation of Cd in the crate. Read fem_core::nzs1170_5::design_spectrum for what IS and is NOT verified about using it as a modal design spectrum - the clause basis is a reading, and the T = 0 ordinate is the sharp edge of it.

Field	Type	Required	Description
annual_probability	number	yes
mu	number	yes	Structural ductility factor mu, Cl 4.3.
n_max	number | null		Default: null.
near_fault_km	number | null		Default: null.
soil	string	yes
sp	number	yes	Structural performance factor Sp, Cl 4.4.
z	number	yes

WasmNzDesignSpectrumResult

Used by nzs1170_design_spectrum.

Field	Type	Required	Description
citation	string	yes	The same sentence the UI prints beside the numbers, so the reading travels with them.
clause	string	yes
floored	boolean	yes	True when the floor decided at least one ordinate, for a one-line caveat.
floored_periods	number[]	yes	The periods where Eq 5.2(2)'s floor decided the ordinate rather than Eq 5.2(1).
mu	number	yes
points	[number, number][]	yes	(period s, Cd) pairs, one per Table 3.1 period, ascending.
r	number	yes
r_capped	boolean	yes
sp	number	yes
z	number	yes

WasmNzEquivalentStaticInput

Used by nzs1170_equivalent_static.

NZS 1170.5:2004 Cl 6.2: the equivalent static method - base shear and the force at each level.

Field	Type	Required	Description
annual_probability	number	yes
levels	[number, number][]	yes	(seismic weight N, height above base m) per level, in any order.
mu	number	yes
n_max	number | null		Default: null.
near_fault_km	number | null		Default: null.
period	number	yes
soil	string	yes
sp	number	yes
weight	number | null		Seismic weight Wt, newtons (Cl 4.2). Omit to have it summed from levels. Default: null.
z	number	yes

WasmNzEquivalentStaticResult

Used by nzs1170_equivalent_static.

Field	Type	Required	Description
base_shear	number	yes
cd	number	yes
cd_unfloored	number	yes
clause	string	yes
floor_governs	boolean	yes
k_mu	number	yes
levels	WasmNzStoreyForce[]	yes
seismic_weight	number	yes

WasmNzPartInput

Used by nzs1170_part_force.

NZS 1170.5:2004 Section 8: the earthquake force on a part or component supported at level i. cph (Table 8.2) and rp (Table 8.1) are caller inputs - neither table is carried, and a risk factor is the importance of somebody's plant, not something to guess. A part supported directly on the ground floor is out of scope for this clause entirely: Cl 8.2 sends it to Section 5 as a separate structure, which is the engineer's call rather than something detectable here.

Field	Type	Required	Description
annual_probability	number	yes
cph	number	yes	Part horizontal response factor C_ph, Table 8.2.
hi	number	yes	Height of the part's attachment above the base, m. Below ground floor reads as ground floor.
hn	number	yes	Height from the base to the uppermost seismic mass, m.
n_max	number | null		Default: null.
near_fault_km	number | null		Default: null.
rp	number	yes	Part risk factor R_p, Table 8.1.
soil	string	yes
tp	number	yes	Period of the part itself, seconds (Cl 8.4).
wp	number	yes	Weight of the part, newtons.
z	number	yes

WasmNzPartResult

Used by nzs1170_part_force.

Field	Type	Required	Description
c_hi	number	yes
c_i	number	yes
c_zero	number	yes	C(0), from Table 3.1's BRACKETED column - not the general spectrum at zero period.
capped	boolean	yes	True when 3.6 W_p decided the answer.
clause	string	yes
cp	number	yes
force	number	yes	F_ph, newtons, after Eq 8.5(1)'s 3.6 W_p cap.
unbounded	number	yes

WasmNzs3404CombinedInput

Used by nzs3404_combined.

One member, one load case. Capacities are DESIGN values (phi already applied), demands are the load case's, and n_star is NEGATIVE in compression.

Field	Type	Required	Description
doubly_symmetric	boolean		Whether the outline is doubly symmetric. With kf and the class, this is the third condition on the higher tier of Cl 8.3.2/8.3.3, and it cannot be inferred from the numbers above. Default: false.
kf	number		Default: 1.
m_star_x	number	yes
m_star_y	number		Default: 0.
n_star	number	yes
phi_mbx	number	yes
phi_msx	number	yes
phi_msy	number		Default: 0.
phi_ncx	number	yes
phi_ncy	number	yes
phi_ns	number	yes
phi_nt	number	yes
phi_vv	number		Default: 0.
section_class	string	yes	"compact" | "non-compact" | "slender", from the capacity record.
v_star	number		Default: 0.

WasmNzs3404CombinedResult

Used by nzs3404_combined.

Field	Type	Required	Description
governed_by	string	yes	The clause the governing check came from, for the report line.
higher_tier	boolean	yes
phi_m_ix	number	yes
phi_m_ox	number	yes
phi_m_rx	number	yes
phi_m_ry	number	yes
util_axial	number	yes
util_max	number	yes
util_member_biaxial	number	yes
util_member_in_plane	number	yes
util_member_out_of_plane	number	yes
util_section_biaxial	number	yes
util_section_x	number	yes
util_section_y	number	yes
util_shear	number	yes

WasmNzs3404MemberInput

Used by nzs3404_member_check.

One member, one load case, in the units the studio already speaks: mm, MPa, N and N·mm.

Field	Type	Required	Description
ag	number	yes	Gross area, net area (mm²) and the Cl 7.3 correction factor for eccentric end connections.
alpha_m	number		Cl 5.6.1.1 moment modification factor. Pass 1.0 for uniform moment. Default: 1.
an	number		Default: 0.
bf	number		Default: 0.
category	string	yes	"1", "2", "3" or "4" - NZS 3404 Section 12. No default: see the note above.
d	number	yes	Overall depth, flange width, flange thickness, web thickness (mm). For a CHS, d is the outside diameter and tw the wall.
doubly_symmetric	boolean		Whether the outline is doubly symmetric - one of the three conditions on the higher tier of Section 8, and not inferable from the numbers above. Default: false.
e	number		Elastic and shear moduli (MPa). Default to the standard's steel values. Default: 200000.
family	string	yes	Which shear-area and slenderness family the outline belongs to: "hot-rolled-i", "welded-i", "rhs", "chs".
fu	number	yes	Tensile strength (MPa).
fyf	number	yes	Flange yield stress (MPa) - Cl 5.2.1 reads the FLANGE value, not the lower of flange and web.
fyw	number		Web yield stress (MPa). Default: 0.
g	number		Default: 80000.
iw	number	yes
iy	number	yes	Second moment of area about the minor axis (mm⁴), torsion constant (mm⁴), warping constant (mm⁶) - the Cl 5.6.1.1 reference buckling moment needs all three.
j	number	yes
kf	number		Form factor (Cl 6.2). 1.0 for a fully effective section. Default: 1.
kte	number		Default: 1.
le_ltb	number	yes
lex	number	yes	Effective lengths for compression about each axis, and for lateral-torsional buckling (mm).
ley	number	yes
m_star_x	number		Default: 0.
m_star_y	number		Default: 0.
n_star	number		Design actions for this load case. n_star is NEGATIVE in compression. Default: 0.
rx	number	yes	Radii of gyration (mm).
ry	number	yes
sx	number	yes
sy	number	yes
tf	number		Default: 0.
tw	number	yes
v_star	number		Default: 0.
zx	number	yes	Elastic and plastic section moduli about each axis (mm³).
zy	number	yes

WasmNzSiteHazardInput

Used by nzs1170_site_hazard.

NZS 1170.5:2004 Cl 3.1: the elastic site hazard spectrum for horizontal loading. z is the hazard factor, a caller input: Table 3.3's list of New Zealand locations is not carried, so this build cannot look it up and does not pretend to. n_max likewise comes from Table 3.7, which needs the fault list of Table 3.6 to be meaningful; omit it and the near-fault factor is 1.0, which is what Cl 3.1.6.1 gives at an annual probability of 1/250 or more frequent.

Field	Type	Required	Description
annual_probability	number	yes	Annual probability of exceedance, as a fraction: 1/500 is 0.002 (Table 3.5).
n_max	number | null		Nmax(T) from Table 3.7, which this build does not carry. Default: null.
near_fault_km	number | null		Shortest distance to a Table 3.6 fault, km. With n_max, drives Cl 3.1.6. Default: null.
period	number	yes	Period T, seconds. Table 3.1 stops at 4.5 s and so does this.
soil	string	yes	Site subsoil class A, B, C, D or E (Cl 3.1.3). A and B are one column of Table 3.1.
z	number	yes	Hazard factor Z (Cl 3.1.4, Table 3.3).

WasmNzSiteHazardResult

Used by nzs1170_site_hazard.

Field	Type	Required	Description
c_t	number	yes
ch_t	number	yes
clause	string	yes
n_t_d	number	yes
r	number	yes
r_capped	boolean	yes	True when Cl 3.1.1's cap held Z R down to 0.7.
r_table	number	yes
z	number	yes

WasmNzStoreyForce

Field	Type	Required	Description
force	number	yes
height	number	yes
top_lump	number	yes	The 0.08 V lump, which is non-zero at the top level only.
weight	number	yes

WasmOpenWindInput

Used by as1170_open_wind.

One export, routed by kind, so a scripting caller has one door for every open structure: { kind: "hoarding", region, terrain, return_period_years, m_d, m_s, m_t, b, c, h, solidity, wind: "normal"|"45"|"parallel", return_corner, friction: "ribs"|"corrugations"|"smooth" } { kind: "free_roof", ...site..., roof: "mono"|"pitched"|"troughed", alpha_deg, h, d, b, blockage (0 empty .. 1 blocked), wind: "0"|"90"|"180", tributary_area_m2, k_l } { kind: "attached_canopy", ...site..., h, hc, wc, slope_deg, enclosure: "open"|"wall_one_side"|"wall_two_sides", parallel, tributary_area_m2, k_l } { kind: "local_pressure", case: "WA1".."SA5", b, d, h, cp_e, parapet_hp } Every refusal comes back as { "error": ... }, never as a zero.

Field	Type	Required	Description
alpha_deg	number		Default: 0.
b	number		Default: 0.
blockage	number		Default: 0.
c	number		Default: 0.
case	string		Default: "".
cp_e	number		Default: 0.
d	number		Default: 0.
enclosure	string		Default: "".
friction	string		Default: "".
h	number		Default: 0.
hc	number		Default: 0.
k_l	number		Default: 1.
kind	string	yes
m_d	number		Default: 1.
m_s	number		Default: 1.
m_t	number		Default: 1.
parallel	boolean		Default: false.
parapet_hp	number | null		Default: null.
region	string		Default: "A".
return_corner	boolean		Default: false.
return_period_years	number		Default: 500.
roof	string		Default: "".
slope_deg	number		Default: 0.
solidity	number		Default: 1.
terrain	string		Default: "TC2".
tributary_area_m2	number		Default: 10.
wc	number		Default: 0.
wind	string		Default: "".

WasmPadFootingInput

Used by pad_footing_design.

Field	Type	Required	Description
asDowelProvided	number		Default: 0.
asProvidedX	number		Default: 0.
asProvidedY	number		Default: 0.
barDiameter	number		Default: 0.
bearingBasis	string		Default: "allowable".
columnBx	number	yes
columnBy	number	yes
columnEx	number		Default: 0.
columnEy	number		Default: 0.
columnPosition	string		Default: "interior".
cover	number	yes
designSection	DesignSection		Default: {"kind":"face"}.
fPrimeC	number	yes
fPrimeCColumn	number		Default: 0.
fSy	number	yes
footingBx	number	yes
footingBy	number	yes
footingH	number	yes
mxService	number		Default: 0.
mxStar	number	yes
myService	number		Default: 0.
myStar	number	yes
nService	number		Default: 0.
nStar	number	yes
pedestalHeight	number		Default: 0.
phiBaseDeg	number		Default: 30.
qBearing	number	yes
reinfClass	ReinforcementClass		Default: "n".
reinforced	boolean		Default: true.
selfWeight	number		Default: 0.
standard	FootingCode		Default: "as3600".
vStar	number		Default: 0.

WasmPadFootingResult

Used by pad_footing_design.

Field	Type	Required	Description
aSDowelReq	number	yes
aStMin	number	yes
aStXProvided	number	yes
aStXReq	number	yes
aStYProvided	number	yes
aStYReq	number	yes
bearingStressCapacity	number	yes
bearingStressDemand	number	yes
checksRefused	string[]	yes
contactState	string	yes
cornerPressures	number[]	yes
dEff	number	yes
developmentAvailableM	number	yes
developmentDetail	string	yes
developmentLstM	number	yes
governing	string	yes
infinite	string[]	yes	Utilisation fields that are +Infinity (a decided failure), which JSON would otherwise turn into null and so into "not evaluated". The JS adapter restores them.
kUoX	number	yes
kUoY	number	yes
mXDesign	number	yes
mYDesign	number	yes
note	string | null
overturningE	number	yes
overturningELimit	number	yes
phiBendingX	number	yes
phiBendingY	number	yes
phiVPunch	number	yes
phiVUc	number	yes
plain	WasmPlainConcreteCheck | null		Present only when the caller asked for an UNREINFORCED footing; null otherwise, which is what every existing caller sees.
punchingPerimeter	number	yes
qAllowable	number	yes
qMax	number	yes
slidingResistance	number	yes
thicknessRequired	number	yes
utilBearing	number	yes
utilBearingStress	number	yes
utilDevelopment	number	yes
utilDowelDevelopment	number	yes
utilDowelTension	number	yes
utilMax	number	yes
utilMomentX	number	yes
utilMomentY	number	yes
utilOverturning	number	yes
utilPedestal	number	yes
utilPunching	number	yes
utilShear	number	yes
utilSliding	number	yes
vPunch	number	yes
vUc	number	yes
vX	number	yes
vY	number	yes

WasmPartInput

Used by as1170_part_force.

AS 1170.4:2024 Section 8, parts and components. method picks the clause: "simple" is Cl 8.3 (height amplification, no analysis of the structure needed) and "acceleration" is Cl 8.2(1) (an effective floor acceleration the caller already has).

Field	Type	Required	Description
annual_probability	number | null
ductility	string		"flexible-ductile", "rigid", "non-ductile" or "connection" (Cl 8.2). Default: "".
floor_acceleration	number | null		Cl 8.2(1): effective floor acceleration at the component's level, as a fraction of g. It is floored at k_p Z C_h(0) by the clause, and the result says whether that floor applied. Default: null.
hn_m	number | null		Cl 8.3: total height of the structure above the structural base, metres. Default: null.
hx_m	number | null		Cl 8.3: height at which the component is attached above the structural base, metres. Default: null.
importance	string		"importance-level-4", "life-safety-critical" or "other" (Cl 8.2). Default: "".
location	string | null		Table 3.2 location name, or pass z directly from Figure 3.2. Default: null.
mechanical_or_electrical	boolean		Cl 8.1.3: a mechanical or electrical component also takes a vertical force of half the horizontal one, NOT acting at the same time. Set this and the result carries it. Default: false.
method	string		Default: "".
mounting	string		"flexible-spring-mechanical" or "other" (Cl 8.2). Default: "".
soil	string	yes	Site sub-soil class Ae to Ee; Table 6.4's BRACKETED Ch(0) is the one Section 8 uses.
weight_n	number	yes	W_c, the component's seismic weight, in NEWTONS.
z	number | null		Default: null.

WasmPartResult

Used by as1170_part_force.

Field	Type	Required	Description
a_c	number	yes
a_floor	number	yes
acceleration_floored	boolean	yes
bound	string	yes	"computed", "lower" (0.05 W_c governed) or "upper" (0.5 W_c governed).
clause	string	yes
force_n	number	yes
height_amplification	number | null
i_c	number	yes
r_c	number	yes
unbounded_n	number	yes
vertical_n	number | null		Cl 8.1.3's vertical force, when the component is mechanical or electrical. It is an ALTERNATIVE load case to the horizontal force, never an addition to it.

WasmPlainConcreteCheck

The AS 3600 Section 20 plain-concrete checks, in the camelCase the browser reads. Its own struct rather than re-exporting fem_core::pad_footing::PlainConcreteCheck because the core type is snake_case and Serialize-only, and every other field crossing this boundary is camelCase and round-trips. ADDED 2026-09-09 with the reinforced option itself. Without it the boundary returned governing: "plain_moment" and a utilisation over 1.0 with no check behind it - a number an engineer is asked to act on and cannot see the working for. The option was reachable and its ANSWER was not.

Field	Type	Required	Description
dDesign	number	yes	Design depth D used by Section 20, m. Not d_eff: plain concrete has no bar to measure to.
fCtF	number	yes	Characteristic flexural tensile strength, MPa (Cl 3.1.1.3, 0.6*sqrt(f'c)).
meetsMinDepth	boolean	yes	Cl 20.2: does the pad meet the minimum depth for a plain footing?
phiMuo	number	yes
phiVu	number	yes
utilMoment	number	yes
utilShear	number	yes

WasmPlate

Input model for WASM. Quad-only: triangles are not supported by the current formulation.

Field	Type	Required	Description
id	integer	yes
material_id	integer	yes
node_ids	integer[]	yes	Three ids (a triangle, stored [a, b, c, c]) or four (a quad).
thickness	number	yes

WasmPlateCompactness

Field	Type	Required	Description
lambda_e	number	yes
lambda_ep	number	yes
lambda_ey	number	yes

WasmPlateLoad

Field	Type	Required	Description
load_case_id	integer	yes
plate_id	integer	yes
pressure	number	yes

WasmPlateNodalResult

Field	Type	Required	Description
mx	number	yes
mxy	number	yes
my	number	yes
node_id	integer	yes
plate_id	integer	yes
sx	number	yes
sy	number	yes
txy	number	yes
vonMises	number	yes
vonMisesMembrane	number		von Mises of the membrane stresses only; vonMises is the surface peak (SA-45). Default: 0.

WasmPlateResult

Field	Type	Required	Description
bucklingFactor	number | null
material_axes	MaterialAxisResult | null		Orthotropic plates only: m1/m2/m12 and n1/n2/n12 along the grain (see model::MaterialAxisResult).
mx	number	yes
mx_star_bottom	number	yes
mx_star_top	number	yes
mxy	number	yes
my	number	yes
my_star_bottom	number	yes
my_star_top	number	yes
plate_id	integer	yes
sigma1Bottom	number	yes
sigma1Top	number	yes
sigma2Bottom	number	yes
sigma2Top	number	yes
sx	number	yes
sxBottom	number	yes
sxTop	number	yes
sy	number	yes
syBottom	number	yes
syTop	number	yes
thetaPBottom	number	yes
thetaPTop	number	yes
txy	number	yes
vonMises	number	yes
vonMisesMembrane	number		von Mises of the membrane stresses only; vonMises is the surface peak (SA-45). Default: 0.

WasmPoint2

Field	Type	Required	Description
x	number	yes
y	number	yes

WasmPortalWindInput

Used by as1170_portal_wind.

AS/NZS 1170.2 wind on a portal-framed building, per direction (0, 180, 90, 270): q at h, wall Cpe, side-wall and roof zones from the windward edge, Ka for one frame, and the internal pressure with a dominant opening placed in a named wall (Table 5.1(B)). The same site/building fields as as1170_wind_design, plus opening: { ratio, wall: "none"\|"x0"\|"xb"\|"y0"\|"yl", at_m } and trib (one frame's tributary width, m). Returns { directions: [...] } or { error }.

Field	Type	Required	Description
alpha_deg	number		Default: 0.
b	number	yes
d	number	yes
h_e	number	yes
m_d	number		Default: 1.
m_s	number		Default: 1.
m_t	number		Default: 1.
open_ratio	number		Default: 0.
opening	DominantOpening | null		Default: null.
region	string	yes
return_period_years	number		Default: 500.
roof	string		Default: "".
terrain	string	yes
trib	number		Default: 0.

WasmPressureFieldInput

Used by footing_pressure_field.

Field	Type	Required	Description
bx	number	yes
by	number	yes
mx	number	yes
my	number	yes
n	number	yes
nx	integer		Default: 25.
ny	integer		Default: 25.

WasmPurlinCleatInput

Used by purlin_cleat_check.

Purlin cleat (conn_purlin.rs). SI in (m, Pa, N); the core works in mm and MPa.

Field	Type	Required	Description
bolt_count	integer	yes
bolt_dia	number	yes
bolt_grade	string	yes
bolt_height	number	yes
cleat_b	number	yes
cleat_edge	number	yes
cleat_fu	number	yes
cleat_fy	number	yes
cleat_t	number	yes
purlin_fu	number	yes
purlin_t	number	yes
v_lat	number		Default: 0.
v_star	number	yes
weld_leg	number	yes

WasmPurlinCleatResult

Used by purlin_cleat_check.

Field	Type	Required	Description
bearingC	number	yes
phiBoltShear	number	yes
phiCleatBearing	number	yes
phiCleatBending	number	yes
phiCleatTearout	number	yes
phiPurlinBearing	number	yes
phiWeldShear	number	yes
util_bolt_shear	number	yes
util_cleat_bearing	number	yes
util_cleat_bending	number	yes
util_max	number	yes
util_purlin_bearing	number	yes
util_weld	number	yes
v_lat	number	yes
v_star	number	yes

WasmRaftFeInput

Used by raft_fe_design.

Task 9 wasm-boundary input: a polygon raft footprint + column loads + the reinforcement design parameters, camelCase JSON. No sizing field is exposed here - raft_fe_design below derives one automatically (see derive_raft_sizing) so a UI caller only ever supplies plan geometry and loads, never mesher internals.

Field	Type	Required	Description
columns	ColumnLoad[]	yes
dEff	number	yes
eConcrete	number		Default: 30000000000.
fPrimeC	number	yes
fSy	number	yes
fidelity	MeshFidelity		Default: "light".
holes	number[][][]		Default: [].
ks	number	yes
ksHi	number	yes
ksLo	number	yes
nu	number		Default: 0.2.
outer	number[][]	yes
selfWeight	number		Default: 0.
thickness	number	yes

WasmRcBarRow

Field	Type	Required	Description
count	integer	yes
diameter	number	yes

WasmRcBeamCapacityInput

Used by rc_beam_section_capacity.

Field	Type	Required	Description
b	number	yes	Section width (m).
bottom_bars	WasmRcBarRow	yes	Bottom reinforcement row.
cover	number	yes	Concrete cover to bar centroid (m).
e_c	number		Concrete elastic modulus (Pa). Defaults to 30 GPa. Default: 30000000000.
e_s	number		Steel elastic modulus (Pa). Defaults to 200 GPa. Default: 200000000000.
f_prime_c	number	yes	Concrete compressive strength f'c (Pa).
f_sy	number	yes	Steel yield stress fsy (Pa).
h	number	yes	Section height (m).
kappa_max	number		Maximum curvature for the M-κ curve (1/m). Default: 0.005.
mesh_size	number		Fiber mesh size (m). Smaller = more accurate but slower. Default: 0.002.
n_kappa_points	integer		Number of points on the M-κ curve. Default: 20.
top_bars	WasmRcBarRow | null		Top reinforcement row (optional). Default: null.

WasmRcBeamCapacityOutput

Used by rc_beam_section_capacity.

Field	Type	Required	Description
area_concrete	number	yes	Plain concrete area, b × h (m²).
area_transformed	number	yes	Transformed gross area, concrete + n·A_s (m²).
d_na_cracked	number	yes	Cracked neutral-axis depth from extreme compression fibre (m).
i_cracked	number	yes	Cracked second moment of area about cracked neutral axis (m⁴).
i_gross	number	yes	Gross second moment of area about centroidal x-axis (m⁴).
k_uo	number	yes	Neutral-axis parameter k_uo = c / d_o at ultimate.
m_cr	number	yes	Cracking moment (N·m).
m_u	number	yes	Nominal ultimate moment capacity from AS 3600 stress block (N·m).
moment_curvature	WasmRcMomentCurvaturePoint[]	yes	Moment-curvature curve.
phi	number	yes	Capacity reduction factor, AS 3600 Table 2.2.2 (ductility-dependent, 0.65 to 0.85).
phi_m_u	number	yes	Capacity-reduced ultimate moment phi * M_u (N·m).
y_centroid	number	yes	Gross section centroid height from bottom (m).

WasmRcBeamInput

Used by as3600_rc_beam_moment.

Field	Type	Required	Description
a_sc	number		Default: 0.
a_st	number	yes
b	number	yes
d	number	yes
d_sc	number		Default: 0.
f_prime_c	number	yes
f_sy	number	yes

WasmRcBeamResult

Used by as3600_rc_beam_moment.

Field	Type	Required	Description
a	number	yes
kU	number	yes
overReinforced	boolean	yes
phi	number	yes
phiMu	number	yes

WasmRcBeamServiceInput

Used by as3600_rc_beam_serviceability.

Field	Type	Required	Description
a_sc	number		Default: 0.
a_st	number	yes
b	number	yes	SI in: m, m^2, Pa, N/m, N.m. b, D (d_section), d, d_sc; A_st, A_sc; f'c, E_s (default 200 GPa)
d	number	yes
d_sc	number		Default: 0.
d_section	number	yes
defl_limit	number | null		Default: null.
e_s	number | null		Default: null.
eps_cs	number | null		Default: null.
f_prime_c	number	yes
g	number	yes
m_s	number | null		M_s* in N.m, required for continuous spans Default: null.
psi_l	number	yes
psi_s	number	yes
q	number	yes
span	number	yes
support	BeamSupport	yes	"simply_supported" | "cantilever" | "continuous_end" | "continuous_interior"

WasmRcBiaxialInput

Used by rc_column_interaction_surface_3d.

Field	Type	Required	Description
b	number	yes
f_prime_c	number	yes	Concrete compressive strength f'c (Pa).
f_sy	number	yes	Steel yield stress fsy (Pa).
h	number	yes
mesh_size	number		Fiber mesh size (m). Defaults to 0.005. Default: 0.002.
n_c	integer		Number of neutral-axis depths per angle (>= 3). Default: 21.
n_theta	integer		Number of neutral-axis angles to sweep (>= 2). Default: 8.
rebars	WasmRcRebar[]		Reinforcing bars as a list of {x, y, area} (SI units). Default: [].

WasmRcBiaxialOutput

Used by rc_column_interaction_surface_3d.

Field	Type	Required	Description
n_c	integer	yes
n_theta	integer	yes
points	WasmRcBiaxialPoint[]	yes

WasmRcBiaxialPoint

Field	Type	Required	Description
m_x	number	yes
m_y	number	yes
p	number	yes

WasmRcColumnCurvePoint

Field	Type	Required	Description
c	number	yes
label	string	yes
m	number	yes
n	number	yes
phi	number	yes
phiM	number	yes
phiN	number	yes

WasmRcColumnCurveResult

Used by as3600_rc_column_interaction_curve.

Field	Type	Required	Description
mBalanced	number	yes
nBalanced	number	yes
phiMu	number	yes
phiNuo	number	yes
points	WasmRcColumnCurvePoint[]	yes

WasmRcColumnInput

Used by as3600_rc_column_capacity, as3600_rc_column_interaction_curve.

Field	Type	Required	Description
a_sc	number	yes
a_st	number	yes
b	number	yes
d	number	yes
d_sc	number		Default: 0.
d_section	number	yes
f_prime_c	number	yes
f_sy	number	yes
m_star	number	yes
n_star	number	yes

WasmRcColumnResult

Used by as3600_rc_column_capacity.

Moments are N·m, matching the input contract and as3600_rc_column_interaction_curve. The conversions below were /1e6 (which yields kN·m) until 2026-09-21. This export has no JS consumer, so unlike as3600_rc_beam_moment it was never wrong on screen - it was waiting to be.

Field	Type	Required	Description
curve	WasmRcColumnCurveResult	yes
phiMN	number	yes
phiMu	number	yes
phiNuo	number	yes
util_interaction	number	yes
util_m	number	yes
util_max	number	yes
util_n	number	yes

WasmRcDesignItem

Used by as3600_rc_design_batch.

One member for as3600_rc_design_batch. SI throughout: m, Pa, N, N·m. Moments and shears are magnitudes; n_max / n_min are the envelope's axial loads, compression positive.

Field	Type	Required	Description
cover	number | null		Default: null.
f_prime_c	number	yes
f_sy	number | null		Default: null.
h_y	number	yes
h_z	number	yes
length	number		Default: 0.
member_id	integer	yes
my_neg_z	number		Default: 0.
my_pos_z	number		Default: 0.
mz_neg_y	number		Default: 0.
mz_pos_y	number		Default: 0.
n_max	number		Default: 0.
n_min	number		Default: 0.
v_y	number		Default: 0.
v_z	number		Default: 0.
vertical	boolean		Default: false.

WasmRcDesignOut

Used by as3600_rc_design_batch.

The steel one member needs, SI: areas in m², shears in N.

Field	Type	Required	Description
asTotal	number	yes
astNegY	number	yes
astNegZ	number	yes
astPosY	number	yes
astPosZ	number	yes
fitmentsNeeded	boolean	yes
kU	number	yes
kind	string	yes
leR	number	yes
memberId	integer	yes
notes	string[]	yes
pReq	number	yes
phiVucY	number	yes
phiVucZ	number	yes
ratio	number | null		k_u / 0.36 (beam) or p / 4 % (column); null when the section is too small.
status	RcDesignStatus	yes

WasmRcMemberInput

Used by as3600_rc_member_check.

Field	Type	Required	Description
a_sc	number		Default: 0.
a_st	number	yes
b	number	yes
d	number	yes
d_sc	number		Default: 0.
d_section	number	yes
f_prime_c	number	yes
f_sy	number	yes
m_star	number	yes
n_star	number	yes
v_star	number	yes

WasmRcMemberResult

Used by as3600_rc_member_check.

Field	Type	Required	Description
governing	string	yes
phiMN	number	yes
phiMu	number	yes
phiNuo	number	yes
phiVuc	number	yes
util_axial	number	yes
util_bending	number	yes
util_interaction	number	yes
util_max	number	yes
util_shear	number	yes

WasmRcMomentCurvaturePoint

Field	Type	Required	Description
kappa	number	yes
m	number	yes

WasmRcRebar

Field	Type	Required	Description
area	number	yes
x	number	yes
y	number	yes

WasmRcShearInput

Used by as3600_rc_beam_shear.

Field	Type	Required	Description
a_st	number	yes
b	number	yes
d	number	yes
d_overall	number		Overall depth D (m), optional: d_v = max(0.72 D, 0.9 d) (AS 3600 Cl 8.2.1.9). 0 -> 0.9 d. Default: 0.
f_prime_c	number	yes

WasmRcShearResult

Used by as3600_rc_beam_shear.

Field	Type	Required	Description
phi	number	yes
phiVuc	number	yes
rhoW	number	yes
vUc	number	yes

WasmReaction

Field	Type	Required	Description
mx	number	yes
my	number	yes
mz	number	yes
node_id	integer	yes
rx	number	yes
ry	number	yes
rz	number	yes

WasmResponseSpectrumInput

Used by response_spectrum_analysis.

Field	Type	Required	Description
combination_method	string		Default: "SRSS".
damping_ratio	number		Default: 0.05.
direction	string	yes
model	WasmModel	yes
n_modes	integer		Default: 10.
spectrum_points	number[][]	yes	Spectrum points as [[period_s, accel_m_s2], ...]

WasmResponseSpectrumResult

Used by response_spectrum_analysis.

Field	Type	Required	Description
combination_method	string	yes
combined_base_shear	number	yes
combined_displacements	WasmNodeDisplacement[]	yes
damping_ratio	number	yes
direction	string	yes
mode_responses	WasmModeResponse[]	yes
total_effective_mass	number	yes
total_mass	number	yes

WasmResults

Used by analysis_report, session_resolve_loads, session_resolve_member, solve_model, solve_model_pdelta, solve_model_pdelta_with_options, solve_model_tc, solve_model_tc_with_options, solve_model_with_options.

Field	Type	Required	Description
auto_restrained	WasmSingularDof[]		Zero-stiffness DOFs auto-restrained so the model could solve (aggregated across load cases, de-duplicated). Empty/omitted for a clean model.
combinations	WasmCombinationResults[]
combo_stations_omitted	boolean		The combinations carry no station forces (a large job; see COMBO_STATION_LIMIT). Their stations are the factored sum of their load cases' - the studio rebuilds them on demand.
conditioning	WasmSoftDof[]		Free DOFs left "soft" (tiny but non-zero diagonal stiffness) after auto-restrain - the model solved but is near-singular here, so results may be unreliable (aggregated across load cases, keeping the worst stiffness ratio per node/dof). Empty/omitted for a well-conditioned model.
envelope	WasmEnvelopeResults | null
load_cases	WasmLoadCaseResults[]	yes

WasmRetainingWallInput

Used by retaining_wall_design.

Field	Type	Required	Description
baseThickness	number	yes
baseWidth	number	yes
cover	number	yes
fPrimeC	number	yes
fSy	number	yes
gammaSoil	number	yes
gamma_conc	number		Default: 24.
ka	number	yes
phi_base_deg	number		Default: 30.
qAllowable	number	yes
stemThicknessBase	number	yes
stemThicknessTop	number	yes
toeLength	number	yes
wallHeight	number	yes

WasmRetainingWallResult

Used by retaining_wall_design.

Field	Type	Required	Description
eccentricity	number	yes
governing	string	yes
heelAst	number	yes
heelMoment	number	yes
overturningMoment	number	yes
pa	number	yes
paHeight	number	yes
qMax	number	yes
qMin	number	yes
restoringMoment	number	yes
resultantX	number	yes
slidingResistance	number	yes
stemAst	number	yes
stemMoment	number	yes
utilBearing	number	yes
utilHeel	number	yes
utilMax	number	yes
utilOverturning	number	yes
utilSliding	number	yes
utilStem	number	yes

WasmRidgeTieInput

Used by ridge_tie_cleat_check.

Field	Type	Required	Description
bolt_diameter	number	yes
bolt_grade	string		Default: "8.8".
e	number	yes	Weld line to the bolt group's centroid (m).
n_bolts	integer	yes
n_star	number		Default: 0.
plate_b	number	yes
plate_fu	number	yes
plate_fy	number	yes
plate_t	number	yes
tie_end	number		Default: 0.
tie_fu	number		Default: 440000000.
tie_tw	number	yes
v_star	number		Default: 0.
weld_fuw	number		Default: 480000000.
weld_leg	number	yes

WasmRobustnessInput

Used by en1991_1_7_robustness.

{ class: "1"|"2a"|"2b"|"3", construction: "framed"|"wall", gk_kpa, qk_kpa, psi, tie_spacing_m, tie_span_m, storeys, z_m, column_storey_reaction_kn, wall_clear_height_m, wall_thickness_m, wall_plan_area_mm2 }

Field	Type	Required	Description
class	string	yes
column_storey_reaction_kn	number		Default: 0.
construction	string		Default: "".
gk_kpa	number		Default: 0.
psi	number		Default: 1.
qk_kpa	number		Default: 0.
storeys	integer		Default: 1.
tie_spacing_m	number		Default: 0.
tie_span_m	number		Default: 0.
wall_clear_height_m	number		Default: 0.
wall_plan_area_mm2	number		Default: 0.
wall_thickness_m	number		Default: 0.
z_m	number		Default: 0.

WasmRodBraceInput

Used by rod_brace_check.

Rod bracing cleat (conn_rod_brace.rs). SI in (m, Pa, N); the core works in mm and MPa.

Field	Type	Required	Description
bolt_count	integer	yes
bolt_dia	number	yes
bolt_grade	string	yes
lug_edge	number	yes
lug_fu	number	yes
lug_t	number	yes
n_star	number	yes
n_star_bolts	number		Default: 0.
pin_dia	number	yes
pin_fy	number	yes
pin_shear_planes	integer		Default: 2.
rod_dia	number	yes
rod_fu	number	yes
rod_fy	number	yes
threaded	boolean		Default: true.
v_star_bolts	number		Default: 0.

WasmRodBraceResult

Used by rod_brace_check.

Field	Type	Required	Description
n_star	number	yes
phiBoltShear	number	yes
phiBoltTension	number	yes
phiLugBearing	number	yes
phiLugTearout	number	yes
phiPinBearing	number	yes
phiPinShear	number	yes
phiRod	number	yes
rodAn_mm2	number	yes
util_bolts	number	yes
util_lug	number	yes
util_max	number	yes
util_pin_bearing	number	yes
util_pin_shear	number	yes
util_rod	number	yes

WasmSeatInput

Used by seat_check.

Seated beam connection (conn_seat.rs). SI in (m, Pa, N); the core works in mm and MPa. The detail the ASI's Design Guide 6 specifies: a seat welded to the column's face, the beam's bottom flange bearing on it, a stiffener under the seat. seat_len is both the bearing length and the cantilever the seat's own bending is taken over.

Field	Type	Required	Description
beam_d	number	yes
beam_fy	number	yes
beam_tf	number	yes
beam_tw	number	yes
seat_fy	number	yes
seat_len	number	yes
seat_t	number	yes
seat_w	number	yes
stiff_fy	number	yes
stiff_h	number	yes
stiff_t	number	yes
v_star	number	yes
weld_fuw	number		Default: 480000000.
weld_leg	number	yes
weld_len	number	yes

WasmSeatResult

Used by seat_check.

Field	Type	Required	Description
bearingWidth	number	yes
components	WasmConnComponent[]	yes
govComponent	string	yes
govUtil	number	yes
notes	string[]	yes
phiBearingBuckling	number	yes
phiBearingYield	number	yes
status	string	yes

WasmSection

Field	Type	Required	Description
a	number	yes
bf	number		Default: 0.
cold_formed	boolean		Default: false.
d	number		Default: 0.
fy	number		Default: 0.
id	integer	yes
iw	number		Default: 0.
iyy	number	yes
izz	number	yes
j	number	yes
lip	number		Default: 0.
name	string		Default: "".
syy	number		Default: 0.
szz	number		Default: 0.
tf	number		Default: 0.
tw	number		Default: 0.
x0	number		Default: 0.
zyy	number		Default: 0.
zzz	number		Default: 0.

WasmSectionBuilderInput

Used by section_properties.

Field	Type	Required	Description
loops	WasmPoint2[][]	yes

WasmSectionBuilderResult

Used by section_properties.

Field	Type	Required	Description
Asx	number	yes
Asy	number	yes
I1	number	yes
I2	number	yes
Ip	number	yes
Iw	number	yes
Ixx	number	yes
Ixy	number	yes
Iyy	number	yes
Japprox	number	yes
Jopen	number	yes
Sx	number	yes
Sy	number	yes
Zxapprox	number	yes
Zyapprox	number	yes
area	number	yes
cx	number	yes
cy	number	yes
rx	number	yes
ry	number	yes
thetaP	number	yes

WasmSectionDimsInput

Used by section_props_from_dims.

Field	Type	Required	Description
Iw_mm6	number		Default: 0.
Ix_mm4	number		Default: 0.
Iy_mm4	number		Default: 0.
J_mm4	number		Default: 0.
Zx_mm3	number		Default: 0.
area_mm2	number		Default: 0.
category	string	yes
depth_mm	number	yes
flangeThickness_mm	number		Default: 0.
flangeWidth_mm	number	yes
lipLength_mm	number		Default: 0.
name	string		Default: "".
webThickness_mm	number	yes

WasmSeismicDistributionInput

Used by distribute_seismic_forces.

Field	Type	Required	Description
baseShear	number	yes
direction	number[]	yes
distribution	DistributionRule		Which standard's vertical distribution rule: "as1170_4" (the default, and what every caller that predates this field gets) or "nzs1170_5". See DistributionRule in fem-core. Default: "as1170_4".
eccentricityFraction	number		AS 1170.4:2024 Cl 6.6: the accidental eccentricity as a fraction of the storey's plan dimension across the action. The clause says +/- 0.1b; 0.0 (the default) keeps the force at the nominal centre of mass. Both signs have to be run to find the adverse one. Default: 0.
loadCaseId	integer	yes
model	WasmModel	yes
period	number	yes
storeys	WasmStoreyDefinition[]		Default: [].
vertical_axis	string | null		Default: null.

WasmSeismicDistributionResult

Used by distribute_seismic_forces.

Field	Type	Required	Description
k	number	yes
nodalLoads	WasmNodalLoad[]	yes
storeyForces	WasmStoreyForce[]	yes
sumForces	number	yes
totalBaseShear	number	yes

WasmSeismicInput

Used by as1170_seismic_base_shear.

Field	Type	Required	Description
annual_probability	number | null
height_m	number | null		Default: null.
kt	number | null		Default: null.
location	string | null		Default: null.
mu	number | null		Default: null.
period	number | null		Default: null.
r_u	number | null		Default: null.
s_p	number | null		Default: null.
soil	string	yes
sp	number | null		Default: null.
system	string | null		Default: null.
weight	number	yes
z	number | null		Default: null.
zone	string | null		Default: null.

WasmSeismicResult

Used by as1170_seismic_base_shear.

Field	Type	Required	Description
c_h	number	yes
cd	number	yes
citation	string	yes
floored	boolean	yes
kp	number	yes
kp_z_used	number	yes
mu	number	yes
sp	number	yes
t1	number	yes
v	number	yes
z	number	yes

WasmShearBeam

The supported beam, SI (m, Pa). cope: "none" | "top" | "double".

Field	Type	Required	Description
bf	number		Default: 0.
cope	string		Default: "".
d	number	yes
d_cb	number		Default: 0.
d_ct	number		Default: 0.
fu	number		Default: 440000000.
fy	number		Default: 300000000.
fyw	number		Default: 0.
l_c	number		Default: 0.
tf	number	yes
tw	number	yes
welded	boolean		Default: false.

WasmShearKeyInput

Used by shear_key_check.

Field	Type	Required	Description
boltDiameter	number		Default: 0.
concreteFc	number	yes
fuw	number		Default: 480000000.
grade	string		Default: "8.8".
keyB	number	yes
keyFy	number	yes
keyH	number	yes
keyT	number	yes
nAnchor	integer		Default: 0.
nStar	number		Default: 0.
plateB	number	yes
plateD	number	yes
plateFy	number		Default: 0.
plateT	number		Default: 0.
vStar	number		Default: 0.
weldLeg	number		Default: 0.

WasmShearKeyResult

Used by shear_key_check.

Field	Type	Required	Description
components	WasmConnComponent[]	yes
govComponent	string	yes
govUtil	number	yes
notes	string[]	yes
status	string	yes

WasmShearPlateInput

Used by shear_plate_check.

Field	Type	Required	Description
a	number		Default: 0.
a_eh_beam	number		Default: 0.
a_ev	number	yes	Plate edge distance to the end bolts (vertical).
beam	WasmShearBeam | null		The beam as an object, or flat as beam_d / beam_bf / beam_tf / beam_tw / beam_fy / beam_fu - the flat form is what a family package's input map can name.
beam_bf	number		Default: 0.
beam_cope	string		The flat form's cope (SA-113): "none" (default), "swc" / "top", "dwc" / "double", with its top depth, bottom depth and length (m). The nested beam object carries the same fields. Default: "".
beam_d	number		Default: 0.
beam_d_cb	number		Default: 0.
beam_d_ct	number		Default: 0.
beam_fu	number		Default: 440000000.
beam_fy	number		Default: 300000000.
beam_l_c	number		Default: 0.
beam_tf	number		Default: 0.
beam_tw	number		Default: 0.
bolt_count	integer		Default: 0.
bolt_diameter	number	yes
bolt_grade	string		Default: "8.8".
cols	integer		Default: 1.
gauge	number		Default: 0.
kind	string		"fep" (flexible end plate) or "wsp" (web side plate / fin plate, the default). Default: "wsp".
pitch	number	yes
plate_b	number	yes
plate_fu	number	yes
plate_fy	number	yes
plate_t	number	yes
rows	integer		Rows, or leave 0 and give the total bolt_count: rows = ceil(count / cols). Default: 0.
s_g1	number		WSP: weld line to the first bolt column, the beam's end distance, beam top to the top bolt. Default: 0.
threads_included	boolean		Default: true.
v_star	number		Default: 0.
weld_fuw	number		Default: 480000000.
weld_leg	number	yes

WasmShearPlateResult

Used by shear_plate_check.

Field	Type	Required	Description
components	WasmConnComponent[]	yes
dI	number	yes
e	number	yes
govComponent	string	yes
govUtil	number	yes
governing	string	yes
kind	string	yes
notes	string[]	yes
phiVDes	number	yes	Least component capacity (N) and its key (Va..Vh), whatever the demand.
status	string	yes

WasmShearTorsionInput

Used by rc_shear_torsion_combined.

Field	Type	Required	Description
aSt	number	yes
b	number	yes
d	number	yes
fPrimeC	number	yes
h	number	yes
tStar	number	yes
vStar	number	yes

WasmShearTorsionResult

Used by rc_shear_torsion_combined.

Field	Type	Required	Description
governing	string	yes
phiTUc	number	yes
phiVUc	number	yes
utilCombined	number	yes
utilMax	number	yes
utilT	number	yes
utilV	number	yes

WasmSingularDof

A node/direction flagged by the singularity analysis. dof is 0..5 = {Tx,Ty,Tz,Rx,Ry,Rz}; label is the human-readable form.

Field	Type	Required	Description
dof	integer	yes
label	string	yes
node	integer	yes

WasmSizableSpec

One member the optimiser may resize.

Field	Type	Required	Description
category	string	yes
current_kg	number	yes
member_id	integer	yes

WasmSlabDeflectionInput

Used by as3600_slab_deflection.

Field	Type	Required	Description
d	number	yes
f_sy	number	yes
span	number	yes
support_type	integer		Default: 0.
thickness	number		Default: 0.

WasmSlabDeflectionResult

Used by as3600_slab_deflection.

Field	Type	Required	Description
lOverDActual	number	yes
lOverDLimit	number	yes
util_deflection	number	yes

WasmSlabInput

Used by as3600_slab_check.

Field	Type	Required	Description
a_st_per_m	number	yes
col_a	number	yes
col_b	number	yes
cover	number	yes
d	number	yes
f_prime_c	number	yes
f_sy	number	yes
m_star	number	yes
mv_star	number		Moment transferred to the support, M*v (N·m); see WasmSlabPunchingInput::mv_star. Default: 0.
n_star	number	yes
span	number	yes
support_type	integer		Default: 0.
thickness	number		Default: 0.

WasmSlabPunchingInput

Used by as3600_slab_punching_shear.

Field	Type	Required	Description
col_a	number	yes
col_b	number	yes
cover	number	yes
d	number	yes
f_prime_c	number	yes
mv_star	number		Moment transferred to the support, M*v (N·m). Defaults to 0 so an existing payload keeps its old meaning, but Cl 9.3.2(b)(ii) requires it whenever moment IS transferred. Default: 0.
n_star	number	yes

WasmSlabPunchingResult

Used by as3600_slab_punching_shear.

Field	Type	Required	Description
betaH	number	yes	Cl 9.3.1.4 shape factor, and the Cl 9.3.4 moment-transfer outputs. Reported so the result can be hand-checked against the clause instead of taken on trust.
d	number	yes
f_cv	number	yes
phiVUo	number	yes
u	number	yes
util_punching	number	yes
vStarEquivalent	number	yes
vU	number	yes
vUo	number	yes

WasmSlabResult

Used by as3600_slab_check.

Field	Type	Required	Description
a_st_min	number	yes
a_st_provided	number	yes
betaH	number	yes
fCv	number	yes
governing	string	yes
lOverDActual	number	yes
lOverDLimit	number	yes
phiMu	number	yes
phiVUo	number	yes
util_deflection	number	yes
util_max	number	yes
util_min_steel	number	yes
util_moment	number	yes
util_punching	number	yes
vStarEquivalent	number	yes

WasmSlabStripInput

Used by as3600_slab_strip_moment.

Field	Type	Required	Description
a_st_per_m	number	yes
cover	number	yes
d	number	yes
f_prime_c	number	yes
f_sy	number	yes
m_star	number	yes
thickness	number		Default: 0.

WasmSlabStripResult

Used by as3600_slab_strip_moment.

Field	Type	Required	Description
a_st_min	number	yes
a_st_provided	number	yes
phiMu	number	yes
util_min_steel	number	yes
util_moment	number	yes

WasmSnowInput

Used by as1170_snow_load.

Field	Type	Required	Description
altitude_m	number		Height above the Australian Height Datum or New Zealand mean sea level, metres. Default: 0.
annual_probability	number | null		Annual probability of exceedance, as a fraction: 1/500 is 0.002 (Table 5.1). Default: null.
exposure	string		sheltered, semi-sheltered or windswept (Cl 4.2.2). Default: "".
location	string | null		A named Table 5.2 site, which this build does not carry: refused by name if given. Default: null.
region	string		AS/NZS 1170.3:2003 snow region: AS, AT, NzNorth, NzSouth (alpine); AN, AC, AsSub, AtSub (sub-alpine Australia); N1 to N5 (sub-alpine New Zealand). Default: "".
roof_pitch2_deg	number | null		The second slope of a duo-pitched roof; absent for a mono-pitched one. Default: null.
roof_pitch_deg	number		Roof slope, degrees. Default: 0.
terrain_factor	number | null		Terrain classification factor kt, Australian ALPINE regions only: 0.7, 1.0 or 1.3 (Cl 5.3). Default: null.

WasmSoftDof

A "soft" DOF: solved, but its diagonal stiffness is alarmingly small relative to the model maximum (near-mechanism / ill-conditioned). stiffnessRatio is |diag| / max_diag - tiny means results at this DOF may be unreliable.

Field	Type	Required	Description
dof	integer	yes
label	string	yes
node	integer	yes
stiffnessRatio	number	yes

WasmSolveInput

Used by building_slenderness_check, session_create, session_resolve_loads, session_resolve_member, solve_model_pdelta_with_options, solve_model_tc_with_options, solve_model_with_options.

Model + options wrapper for solve requests that need non-default settings.

Field	Type	Required	Description
model	WasmModel	yes
options	WasmSolveOptions		Default: {"extrapolate_plate_results":false,"n_stations":11,"smooth_plate_nodal_results":false,"station_output":"objects"}.

WasmSolveOptions

Solver options exposed to the frontend (mirrors SkyCIV "General Solver" settings).

Field	Type	Required	Description
extrapolate_plate_results	boolean		Default: false.
n_stations	integer		Default: 11.
smooth_plate_nodal_results	boolean		Default: false.
station_output	StationOutput		How the member station forces come back: objects (the default, as always), pack (flat typed arrays per load case - solve_model_typed only; the string export writes objects), or none (not at all: a caller that reads capacities and end forces, like auto-size, skips the bulk of the result). Default: "objects".

WasmSpectrumInput

Used by as1170_design_spectrum.

Input for as1170_design_spectrum: the seismic input MINUS the period and the seismic weight, which a spectrum does not need. The analysis supplies the periods and the model supplies the mass, so requiring either here would make a caller invent a number to get a spectrum.

Field	Type	Required	Description
annual_probability	number | null		Default: null.
location	string | null		Default: null.
mu	number | null		Default: null.
soil	string		Default: "".
sp	number | null		Default: null.
system	string | null		Default: null.
z	number | null		Default: null.

WasmSpliceInput

Used by splice_check.

Field	Type	Required	Description
boltDiameter	number	yes
endDist	number		Default: 0.
flangeT	number	yes
fpB	number	yes
fpFu	number	yes
fpFy	number	yes
fpT	number	yes
grade	string		Default: "8.8".
mStar	number	yes
nFlange	integer	yes
nStar	number		Default: 0.
nWeb	integer		Default: 0.
pitch	number	yes
sectionD	number	yes
vStar	number		Default: 0.
wpT	number		Default: 0.

WasmSpliceResult

Used by splice_check.

Field	Type	Required	Description
components	WasmConnComponent[]	yes
govComponent	string	yes
govUtil	number	yes
notes	string[]	yes
status	string	yes

WasmStationForce

Field	Type	Required	Description
dy	number	yes
dz	number	yes
mx	number	yes
my	number	yes
mz	number	yes
n	number	yes
s	number	yes
s_norm	number	yes
vy	number	yes
vz	number	yes

WasmStoreyDefinition

Field	Type	Required	Description
elevation	number	yes
nodeIds	integer[]	yes

WasmStoreyForce

Field	Type	Required	Description
cv	number	yes
elevation	number	yes
force	number	yes
weight	number	yes

WasmStripFootingInput

Used by strip_footing_design.

Field	Type	Required	Description
asLongProvided	number		Longitudinal steel provided EACH face, mm^2 (0 = check against max(required, minimum)). Default: 0.
asProvided	number		Default: 0.
barDiameter	number		Default: 0.
bearingBasis	string		Default: "allowable".
cover	number	yes
fPrimeC	number	yes
fSy	number	yes
longitudinalBarDiameter	number		Default: 0.
longitudinalSpan	number		Length of lost support the strip spans along the wall, m (0 = not designed). Default: 0.
mService	number		Default: 0.
mStar	number		Default: 0.
nService	number		Default: 0.
nStar	number	yes
qBearing	number	yes
reinforced	boolean		false = an unreinforced strip, checked to AS 3600 Section 20 across its width. Default: true.
selfWeight	number		Default: 0.
standard	FootingCode		Default: "as3600".
stripThickness	number	yes
stripWidth	number	yes
wallThickness	number	yes

WasmStripFootingResult

Used by strip_footing_design.

Field	Type	Required	Description
aStMin	number	yes
aStReq	number	yes
checksRefused	string[]	yes
contactState	string	yes
dEff	number	yes
developmentDetail	string	yes
developmentLst	number	yes
governing	string	yes
kUo	number	yes
longitudinal	WasmStripLongitudinal | null		The design along the wall, present only when a span of lost support was given.
mDesign	number	yes
note	string | null
phiBending	number	yes
phiVUc	number	yes
plain	WasmPlainConcreteCheck | null		The Section 20 checks, present only for an unreinforced strip.
qAllowable	number	yes
qMax	number	yes
qMin	number	yes
utilBearing	number	yes
utilDevelopment	number	yes
utilMax	number	yes
utilMoment	number	yes
utilShear	number	yes
vDesign	number	yes

WasmStripLongitudinal

The strip designed along the wall over a span of lost support, in the camelCase the browser reads.

Field	Type	Required	Description
aStMin	number	yes
aStReq	number	yes
d	number	yes
mDesign	number	yes
phiVUc	number	yes
span	number	yes
utilMoment	number	yes
utilShear	number	yes
vDesign	number	yes
w	number	yes

WasmThroughPlateInput

Used by through_plate_check.

A hollow member through a gusset (conn_hollow_brace::through_plate_capacity). SI in; mm/MPa inside.

Field	Type	Required	Description
f_star	number	yes
n_slots	integer	yes
n_star	number	yes
plate_t	number	yes
tube_d	number	yes
tube_fu	number	yes
tube_fy	number	yes
tube_t	number	yes
weld_leg	number	yes
weld_len	number	yes

WasmThroughPlateResult

Used by through_plate_check.

Field	Type	Required	Description
f_star	number	yes
n_star	number	yes
phiTubeNet	number	yes
phiWeld	number	yes
util_max	number	yes
util_through_weld	number	yes
util_tube_through	number	yes

WasmTimeHistoryInput

Used by modal_time_history_analysis.

Field	Type	Required	Description
damping_ratio	number		Default: 0.05.
direction	number[]		Direction vector [dx, dy, dz] Default: [1,0,0].
model	WasmModel	yes
n_modes	integer		Default: 10.
record	number[][]	yes	Ground motion record: [[time_s, accel_m_s2], ...]

WasmTimeHistoryResult

Used by modal_time_history_analysis.

Field	Type	Required	Description
dt	number	yes
n_modes	integer	yes
n_steps	integer	yes
peakBaseShearX	number	yes
peakBaseShearY	number	yes
peakBaseShearZ	number	yes
peak_displacements	WasmNodeDisplacement[]	yes

WasmVehicle

Field	Type	Required	Description
axle_spacings	number[]	yes
axle_weights	number[]	yes

WasmWebBearingInput

Used by as4100_web_bearing.

AS 4100 Cl 5.13 web bearing (I/C-section webs). SI in (m, Pa), SI out (N). end_dist omitted or negative means an interior load.

Field	Type	Required	Description
b_s	number	yes	Stiff bearing length (m).
both_flanges_restrained	boolean		Both flanges restrained against lateral movement (default true). Default: true.
d1	number	yes	Clear web depth between flanges (m).
end_dist	number		Distance from member end to the nearer edge of the bearing (m). Negative or missing = interior load. Default: -1.
fy	number	yes	Web yield stress (Pa).
tf	number	yes
tw	number	yes

WasmWebCleatInput

Used by web_cleat_check.

Field	Type	Required	Description
boltDiameter	number	yes
dCleat	number	yes
eSup	number		Default: 0.
eWeb	number	yes
edgeDist	number		Default: 0.
endDist	number		Default: 0.
fuCleat	number	yes
fuWeb	number	yes
fyCleat	number	yes
grade	string		Default: "8.8".
nSup	integer	yes
nWeb	integer	yes
pitch	number	yes
tCleat	number	yes
tWeb	number	yes
vStar	number	yes

WasmWebCleatResult

Used by web_cleat_check.

Field	Type	Required	Description
components	WasmConnComponent[]	yes
govComponent	string	yes
govUtil	number	yes
notes	string[]	yes
status	string	yes

WasmWeldedMomentInput

Used by welded_moment_check.

Field	Type	Required	Description
flangeB	number	yes
flangeCpbw	boolean		Default: true.
flangeLeg	number		Default: 0.
flangeT	number	yes
fuw	number		Default: 480000000.
fy	number	yes
mStar	number	yes
nStar	number		Default: 0.
sectionD	number	yes
vStar	number		Default: 0.
webLeg	number		Default: 0.
webT	number		Default: 0.

WasmWeldedMomentResult

Used by welded_moment_check.

Field	Type	Required	Description
components	WasmConnComponent[]	yes
govComponent	string	yes
govUtil	number	yes
notes	string[]	yes
status	string	yes

WasmWeldGroupInput

Used by weld_group_check.

Field	Type	Required	Description
fuw	number	yes
kr	number	yes
mz	number	yes
segments	WasmWeldSegmentInput[]	yes
vx	number	yes
vy	number	yes

WasmWeldGroupResult

Used by weld_group_check.

Field	Type	Required	Description
governingSegment	integer	yes
phiVperMmGov	number	yes
phiVtotal	number	yes
util_max	number	yes
vPerMmGov	number	yes

WasmWeldInput

Used by weld_capacity.

Field	Type	Required	Description
fuw	number		Default: 480000000.
kr	number		Default: 1.
leg_size	number	yes
length	number	yes

WasmWeldResult

Used by weld_capacity.

Field	Type	Required	Description
phiVw	number	yes

WasmWeldSegmentInput

Field	Type	Required	Description
legSize	number	yes
x1	number	yes
x2	number	yes
y1	number	yes
y2	number	yes

WasmWindDesignInput

Used by as1170_wind_design.

Field	Type	Required	Description
alpha_deg	number		Default: 0.
b	number	yes
d	number	yes
h_e	number	yes
m_d	number		Default: 1.
m_s	number		Default: 1.
m_t	number		Default: 1.
open_ratio	number		Default: 0.
region	string	yes
return_period_years	number		Default: 500.
roof	string		Default: "".
terrain	string	yes

WasmWindInput

Used by as1170_wind_pressure.

Field	Type	Required	Description
height	number	yes
region	string	yes
return_period_factor	number		Default: 1.
terrain	string	yes

WasmWindResult

Used by as1170_wind_pressure.

Field	Type	Required	Description
mC	number	yes
mZcat	number	yes
p	number	yes
q	number	yes
vDes	number	yes
vR	number	yes

Weighting

The BS 6841 frequency weighting curves of Section 5.2.2, as Table 5.1 assigns them: W_g for vision and hand control (critical working areas, z), W_b for discomfort (z), W_d for the x and y axes.

One of: "Wg", "Wb", "Wd"

WindDesign

Used by as1170_wind_design.

The full design result the UI consumes.

Field	Type	Required	Description
standard	string	yes
surfaces	SurfacePressure[]	yes
tables	TableStatus[]	yes	Per-table verification, the adapter's own statement (WindStandard::table_status).
trace	Step[]	yes
verified	boolean	yes	ALWAYS false until an engineer cross-checks the coefficient tables against the standard.
warnings	string[]	yes

WindDirection

Wind direction relative to the building. Theta0 = wind normal to the ridge (across the span - the case that governs a portal frame); Theta90 = wind parallel to the ridge (along the building).

One of: "theta0", "theta90"

WoodArmer

Wood-Armer design moments at a point (per unit width). Each is the magnitude of the design moment for that face and direction; 0 means no steel is required there. *_bottom resist sagging (bottom face), *_top resist hogging (top face).

Field	Type	Required	Description
mxBottom	number	yes
mxTop	number	yes
myBottom	number	yes
myTop	number	yes