Verification › V.05 Steel design: IS 800:2007

V.05.3ISMB 300 Beam-Column

Capacity within 0.01%; interaction 1.3% conservative

Open 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.

STAAD.Pro V8i SS6, the same input file run by Sutranet (CODE IS800 LSD, TRACK 2 for the capacity of each clause).

ISMB 300, pinned, 4 m in two members
300 kN axial compression and 15 kN/m (30 kN·m)
E 205 GPa; the checks are given STAAD's section properties, so the comparison is of the code clauses alone

Front view (X right, Y up). Joints numbered, supports marked ▲. Drawn from the project file.

Capacities

Result	Clause	STAAD.Pro	Sutranet	Difference
Compression, minor axis Pd (kN)	7.1.2	988.799	988.714	<0.01%
Interaction ratio	9.3	0.515	0.5215	+1.3% (conservative)

STAAD uses the Cl 9.3.2.2 interaction equations; Sutranet uses the simpler linear interaction, which is slightly conservative here.
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.

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

Free account: build frames, trusses and towers, import STAAD .std files, and run IS 800 and AISC design checks in your browser.