Further studies on the structural behaviour of mono-symmetric I-sections in bending, axial compression and torsion

Within the framework of the evolution of the structural steel code EN 1993-1-1, a simplified design method for members with mono-and double-symmetric I-section in bending, axial compression and torsion was developed. Due to the limited scope of the recent study, it was necessary to limit the application range of the novel method. Based on a comprehensive numerical simulation study, however, this publication analyses whether the models of annex B of prEN 1993-1-1: 2018 for semi-compact class 3 cross-section members as well as the models of annex C.1 of prEN 1993-1-1: 2018 for mono-symmetric cross-sections can be applied to members in scheduled torsion to facilitate a consistent stability verification for structural steel members. An enhanced design model is proposed based on a comprehensive study of the structural member behaviour. A comparative study shows that the application range of the above-mentioned methods can be extended to mono-symmetric cross-sections subjected to torsion.