Sutranet CAD Verification
Sutranet CAD

Verification Examples

These problems check the accuracy of Sutranet CAD's solver, STAAD importer and design checks against published solutions, textbook answers and other programs. Each runs in the automated tests on every change, and each model can be opened in the app to reproduce the result.

Try one now: portal frame vs SAP2000 and OpenSeesNo sign-up needed. Or pick any problem below and press ▶ Open in app.
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Notes on comparisons

  • Difference. References print rounded values. "None" means Sutranet's value rounds to the printed value; otherwise the table gives the relative difference.
  • STAAD.Pro. Where STAAD.Pro is a reference, Sutranet ran the same input file in STAAD.Pro V8i SS6 and compared its printed output.
  • Units. The solver works in SI. Problems set in kip and inch are converted in and the results converted back.
  • P-Delta. STAAD's PDELTA with SMALLDELTA is the reference. STAAD reports moments inside an unmeshed member without the P-δ bow, so the moment along a member is compared with the same model meshed into 10 members.
  • Design checks. The checks are given the reference's section properties, so the comparison is of the code clauses alone.
  • Project files. Built from the same STAAD input files by the app's STAAD importer.

V.01 Trusses

No.ProblemCompared withResult
V.01.13D Space Truss: Axial ForcesMember forces and reactions of a four-joint space truss▶ Open in appBeer & Johnston, STAAD.ProAll 90 values STAAD.Pro prints match

V.02 Frames

No.ProblemCompared withResult
V.02.13D Frame: Maximum ForcesLargest axial force and moments in a three-member space frame▶ Open in appWeaver, STAAD.ProAll 72 values STAAD.Pro prints match
V.02.27-Storey Steel Moment Frame: Lateral LoadSway, base forces and reactions of a 2-bay moment frame▶ Open in appOpenSees, SAP2000, SeismoStruct, STAAD.ProMatches OpenSees, SAP2000, SeismoStruct and STAAD.Pro
V.02.3Member OffsetsRigid end offsets on a portal, an inclined cantilever and a brace▶ Open in appSTAAD.ProMatches STAAD.Pro to its print precision
V.02.4Member Local Axes in Every DirectionSixteen cantilevers, global Y up and SET Z UP▶ Open in appSTAAD.ProEvery tip result matches to the last digit
V.02.5Fixed Portal Frame under a Beam LoadCorner and base moments against slope-deflectionSlope-deflectionWithin 0.9% (the formula ignores axial shortening)

V.03 Second-order (P-Delta) analysis

No.ProblemCompared withResult
V.03.1Pinned Beam-Column, Uniform LoadFirst-order and P-Delta results against STAAD.Pro▶ Open in appSTAAD.ProP-Delta within 0.3% of STAAD.Pro
V.03.2Flagpole CantileverFirst-order and P-Delta results against STAAD.Pro▶ Open in appSTAAD.ProP-Delta within 0.3% of STAAD.Pro
V.03.3Fixed Sway PortalFirst-order and P-Delta results against STAAD.Pro▶ Open in appSTAAD.ProP-Delta within 0.3% of STAAD.Pro
V.03.4Pinned Beam-Column, Point LoadFirst-order and P-Delta results against STAAD.Pro▶ Open in appSTAAD.ProP-Delta within 0.3% of STAAD.Pro
V.03.5Leaning ColumnFirst-order and P-Delta results against STAAD.Pro▶ Open in appSTAAD.ProP-Delta within 0.3% of STAAD.Pro
V.03.6Biaxial Cantilever, BETA 30First-order and P-Delta results against STAAD.Pro▶ Open in appSTAAD.ProP-Delta within 0.3% of STAAD.Pro
V.03.7Second-Order Closed-Form SolutionsTip-loaded cantilever and a leaning columnBeam-column theoryWithin 0.01% of the exact solution

V.04 Dynamic analysis

No.ProblemCompared withResult
V.04.17-Storey Steel Moment Frame: Natural PeriodsAll 7 periods and modal masses of the frame of V.02.2▶ Open in appOpenSees, SAP2000, SeismoStruct, STAAD.ProAll 7 periods match OpenSees to 5 decimals
V.04.2Space Frame with Joint MassesTwelve frequencies of a braced two-storey frame▶ Open in appSTAAD.ProAll 12 frequencies match STAAD.Pro's 3 decimals
V.04.3Cantilever Natural FrequenciesFirst and third modes against beam theoryBeam theoryWithin 0.011%

V.05 Steel design: IS 800:2007

No.ProblemCompared withResult
V.05.1ISMB 300 Beam: Lateral-Torsional BucklingMember capacity against STAAD.Pro (CODE IS800 LSD)▶ Open in appSTAAD.ProWithin 0.02% of STAAD.Pro
V.05.2Short ISMB 300: Shear GovernsMember capacity against STAAD.Pro (CODE IS800 LSD)▶ Open in appSTAAD.ProWithin 0.02% of STAAD.Pro
V.05.3ISMB 300 Beam-ColumnMember capacity against STAAD.Pro (CODE IS800 LSD)▶ Open in appSTAAD.ProCapacity within 0.01%; interaction 1.3% conservative
V.05.4ISMB 300 Bent about its Minor AxisMember capacity against STAAD.Pro (CODE IS800 LSD)▶ Open in appSTAAD.ProWithin 0.02% of STAAD.Pro
V.05.5ISA 100×100×10 Angle StrutMember capacity against STAAD.Pro (CODE IS800 LSD)▶ Open in appSTAAD.ProWithin 0.16% of STAAD.Pro (exact with STAAD's section properties)
V.05.6Pipe 168.3 × 10 StrutMember capacity against STAAD.Pro (CODE IS800 LSD)▶ Open in appSTAAD.ProWithin 0.02% of STAAD.Pro

V.06 Steel design: AISC 360

No.ProblemCompared withResult
V.06.1ISMB 300 Beam against STAAD.ProAISC 360 LRFD capacities of the V.05.1 beam▶ Open in appSTAAD.ProWithin 1% of STAAD.Pro
V.06.2AISC Design ExamplesEight worked examples, compression to single-angle bendingAISC Design ExamplesAll 8 within 0.5% of the book

V.07 Section properties

No.ProblemCompared withResult
V.07.1IS 808 Section Table against STAAD.ProAll 345 sections both tables listSTAAD.Pro341 of 345 within edition tolerance; 4 named edition differences
V.07.2Computed Section PropertiesProperties computed from dimensions against the AISC and Eurocode tablesAISC tables, Eurocode tablesWithin 1% (J within 5%)
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.

Create free account