Answer:
In principle, the program always tries to perform plastic design for Class 1 and Class 2 cross-sections. However, if the torsion is contained additionally, the design can only be performed elastically. This is due to the interaction conditions according to EN 1993‑1‑1, Section 6.2.9, which do not include any torsional component.
For this reason, the "Cross-Section Design and Torsion" setting is available in the details of the add-on module. By adjusting the limit shear stress for the cross-section checks, you can also neglect the torsion at your own responsibility.
