I have recently created a 3d stiffness analysis worksheet in Mathcad (It includes member end releases, member rotations includes 3d manipulative graphics display which also shows moments and shears for selected members) and have been checking it with Staad pro output. The results from my mathcad worksheet are near identical, if not exactly the same as the Staad output (generally any differences are attributable to round off with respect to member properties - Staad appears to sometimes slightly differing results depending on what method is used to extract properties data). The SET SHEAR command must be invoked in Staad since my worksheet doesnt include shear deformations which are gen negligible.
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