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The Combined Stress Check including Torsion and Warping is executed according to EN 1993-1-3 art. 6.1.6.
Regarding warping reference is made to "Annex F: Warping check".
The average yield strength fya in all three formulas (6.11a), (6.11b), (6.11c) will only be used in case for all three force components separately (N, My, Mz) the average yield strength may be used (Aeff = Ag ; Weff,y = Wel,y ; Weff,z = Wel,z).