Answer:
No. In RFEM 5 and RSTAB 8 and the RF‑/STEEL add‑on module, warping torsion does not play a role. For members, the warping resistance has no effect here.
RF‑/STEEL calculates torsional stresses close to reality using MT/WT or MT/(IT/z). Using this approach, the warping torsion (the primary and secondary torsion or the warping bimoment) is not considered.
The warping is considered in the add‑on modules RF‑/FE‑LTB, RF‑/STEEL Warping Torsion, and in the cross-section properties program SHAPE‑THIN.
RF‑/STEEL Warping Torsion is an extension of the RF‑/STEEL EC3 add‑on module. It performs lateral‑torsional (flexural-torsional) buckling analysis of members according to the second‑order analysis with 7 degrees of freedom and the application of imperfections with regard to mode shapes. The design checks are based on the standard EN 1993‑1‑1:2005 + AC:2009.
More information can be found in the webinar "New Modules RF‑/STEEL Warping Torsion and RF‑/STEEL Plasticity", which you can download from the Links below.
