Sections & materials

Steel section library

CivilKit Studio ships a real hot-rolled steel section library covering five regions:

Region	Standard	Designations
Australia / NZ	AS/NZS 3679.1	UB / UC (+ PFC)
United States	AISC	W shapes
United Kingdom	BS 4-1 / SCI P363	UB / UC
Europe	EN 10365	IPE / HEA / HEB
Canada	CISC / AISC	W shapes

Open the section library from a member's inspector ("Browse sections") to pick a real catalogue section. Each section carries area, second moments (Ix/Iy), plastic and elastic moduli, and torsion constant J.

Verify before professional use

The catalogues are marked verified: false - they are indicative for early-stage analysis. Every value should be cross-checked against a current manufacturer catalogue and the governing standard before professional use. (An internal consistency check guards the data: Zx = Ix/(d/2), plastic > elastic, and mass = ρ·A all hold across the 275 sections.)

Section properties in the inspector

Select a member and the inspector shows a compact Section properties readout under the section picker: mass/m, depth, A, Ix (major), Iy (minor), Zx, Sx, J. Values come from the catalogue geometry (in mm units) where available, or are converted from the analysis values for a generic section. It is the quick "what are this section's numbers?" check engineers reach for constantly - and confirms, after solving, that a member is bending about the axis you intended (see Member orientation).

Isolate this section

The member inspector also offers "Isolate this section" - it shows only the members that share the selected section (and their nodes), hiding everything else. It is the fast "show me just the 360UBs" view. Show all (A), or selecting anything, restores the full model. The steel take-off rows are clickable too: a click selects and frames a representative member of that section.

Defining a section directly

A section is just its analysis properties (SI):

{ "id": 1, "a": 0.0113, "iyy": 1.43e-4, "izz": 4.85e-5, "j": 3.4e-7 }

izz is the major axis (strong), iyy the minor axis. See the model schema for the full picture.

Materials

{ "id": 1, "e": 200e9, "g": 80e9, "nu": 0.3, "rho": 7850 }

Young's modulus e, shear modulus g, Poisson nu (needed for plate bending), and density rho (self-weight + modal mass). nu/rho default to 0.3 / 7850 if omitted.