Screens torsional shear stress and utilization for HSS sections under point torques and UDL torsion.
Checks torsional shear stress and utilization for HSS sections under point torques and UDL torsion. Computes the internal torsion diagram, support reactions, maximum twist, and a von Mises combined stress (torsional + coexistent transverse shear + bending) against phi*Fy with selectable Fy (300-450W) and phi. Torsional shear uses the closed thin-wall (Bredt) constants J = 4*t*Am^2/pm and C = 2*t*Am.
Screening only. Coexistent moment and shear enter a conservative von Mises combination, not a full CSA S16 member interaction. Thin-wall midline torsional constants (no corner radii), not CISC table values (within ~10% for square HSS).
Warping restraint ignored (appropriate for closed sections).
Use as a screening check for pure torsion demand only. Verify combined member adequacy independently.
Other design checker in the same workspace.
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Every tool ships inside the CoLateral desktop workspace, so a result can stay attached to the project, the drawing, and the review trail it belongs to instead of ending up in a loose spreadsheet.
Outputs are design aids and stay in draft until a qualified engineer reviews and approves them.