Are warping stresses in structural components (for example, an I-section cantilever) that are subject to torsion considered in the add-on module STEEL?
No, warping stresses are not considered in such structural components.
In RSTAB or STEEL, warping torsion is of no importance, and the warping resistance has no influence.
The STEEL module calculates the torsional stresses using MT/WT or MT/(IT/z), which of course represents an approximation and cannot be compared with the warping torsion.
In the moment, warping is considered only in the modules FE-LTB and SHAPE-THIN.