Verification › V.05 Steel design: IS 800:2007
V.05.1ISMB 300 Beam: Lateral-Torsional Buckling
Within 0.02% of STAAD.ProOpen in the app and solveNo sign-up needed: it runs in your browser.
Problem
Compare the IS 800:2007 limit-state capacities with STAAD.Pro's design output.
Reference
- STAAD.Pro V8i SS6, the same input file run by Sutranet (CODE IS800 LSD, TRACK 2 for the capacity of each clause).
Model
- ISMB 300, simply supported, span 6 m in two members, laterally unrestrained (Lb 3 m, Cb 1)
- 15 kN/m: Mz 67.5 kN·m at midspan, V 45 kN at the supports
- fy 250 MPa, fu 410 MPa
- E 205 GPa; the checks are given STAAD's section properties, so the comparison is of the code clauses alone
Comparison
| Result | Clause | STAAD.Pro | Sutranet | Difference |
|---|---|---|---|---|
| Lateral-torsional buckling Md (kN·m) | 8.2.2 | 119.975 | 119.9745 | none |
| Web shear Vd (kN) | 8.4 | 303.109 | 303.1089 | none |
| Flange shear Vd (kN) | 8.4 | 481.3 | 481.3002 | none |
| Compression Pd (kN) | 7.1.2 | 668.24 | 668.120 | 0.018% |
| Tension yield Tdg (kN) | 6.2 | 1334 | 1334.091 | none |
| Governing ratio | 0.563 | 0.5626 | none |
- In the app, sections come from the IS 808:2021 table, which differs from STAAD's older table by up to 1.1% (see V.07.1), so the app's capacities differ from these by about that much.
Reproduce in Sutranet CAD
- Open the project in the app (no sign-up needed), or download the file and open it with 📂 Import Job JSON in the File group.
- Run Analysis (Static) with P-Delta Analysis unticked and Design Code IS 800.
The app works in SI units; results in kip and inch are converted (1 kip = 4.448 kN, 1 kip-in = 0.1130 kN·m, 1 in = 25.4 mm).
Automated test: staad_design.rs, run on every change.
Run your own models the same way
Create free accountFree account: build frames, trusses and towers, import STAAD .std files, and run IS 800 and AISC design checks in your browser.