Data sources & verification
Where every section's data comes from, and how the calculated values were checked. Last reviewed 2026-10-08.
| Section type | Sizes and dimensions from | Verification |
|---|---|---|
| Universal beams and columns, bearing piles, PFC, TFB | AS/NZS 3679.1 sizes as rolled by InfraBuild (300PLUS) (source) | Ix, Iy within 0.12% (median) and 0.9% (max) of published tables across 259 sections; 310UB40.4 A, I, Z, S, J, Iw, φMsx and φVv match InfraBuild |
| Welded beams and columns | AS/NZS 3679.2 standard sizes | Ix, Iy within 1% of published tables |
| Equal and unequal angles | InfraBuild structural and merchant-bar angle ranges (source) | All 62 sizes and nominal masses match InfraBuild; calculated mass within ±0.4%; principal Iu, Iv within 0.5% of published tables |
| Beam and column tees | Derived by halving the UB/UC sections above (cut at mid-depth, no kerf) | Geometry exact; inherits the parent section's verification |
| CHS, SHS, RHS | Australian Tube Mills, Design Capacity Tables for Structural Steel Hollow Sections (Aug 2013): sizes, grades, corner radii (source) | A and Ix within 0.43% for 162 sections; mass within 0.44% for all 251; ATM's worked example (400×200×8 RHS: Zex, compactness, kf) reproduced |
| C and Z purlins | Lysaght Zeds & Cees User Guide: dimensions, thicknesses, grades (source) | A, Ix, Iy, Iu, Iv and α match Lysaght's published values |
| Flat, round and square bar | InfraBuild merchant-bar ranges (source) | Geometry exact (rectangles and circles) |
| Design capacities | AS 4100:2020 (clauses checked against the Standard); steel strengths per AS 4100 Table 2.1 | ASI worked example (250UC72.9 column, Le = 4 m, φNc = 1915 kN) and ATM worked example reproduced; regression tests run on every build |
| Beam and lateral restraint calculators | AS/NZS 1170.0 strength combinations 1.35G and 1.2G + 1.5Q; AS 4100:2020 Cl 5.3.2.4, 5.4, 5.6, 5.11 and 5.12.3 | Moments, shears and deflections match closed-form results; the browser calculators give the same φMb and φNc as the section tables for every section and length (automated tests) |
| Bolt and weld capacities | AS 4100:2020 Table 3.4, Table 9.2.1, Cl 9.2.2–9.2.3, 9.5, 9.6.3.10 (Tables 9.6.3.10(A) and (B)), 14.3.2 and Table 15.2.2.2; bolt areas from AS 1275 | M20 8.8/S φVf = 92.6 kN and φNtf = 163 kN, as in the ASI design capacity tables; grade 10.9 and the 2020 weld metal strengths (e.g. 6 mm E49XX SP fillet weld 0.998 kN/mm) checked by hand; automated tests |
Method
Only nominal dimensions are entered by hand. Every other value (area, second moments, section moduli, torsion and warping constants, AS 4100 capacities) is calculated from the section geometry, including root and toe radii, as described on the notation & method page. The calculated values are compared with the manufacturers' published tables, and the comparisons are kept as automated tests that run whenever the site is rebuilt.
Nominal masses are the manufacturers' catalogue values. Availability of particular sizes varies by supplier and region, so check stock before specifying.
Found a discrepancy?
Email [email protected] with the section and the source you're comparing against. See the corrections policy.