Assessment of Design Approaches for Stainless‐Steel Joints Through an Equivalent FE Modelling Technique

Considering the significant strain-hardening and ductility characteristics of stainless steel and the influential role of beam to column joints in the overall response of structures, a clear understanding of their moment rotation behaviour appears fundamental. In the present study, a review of the European design code for three typical semi-continuous beam-to-column joints (extended end plate, flush end plate and top-and-seat angle connections) is first carried out. Then, using a hybrid modelling strategy with uncoupled elastic-plastic springs for the bolts and shell elements for the members, more refined 3D finite element (FE) models are developed and validated against available test results. An equivalent stress definition is then proposed for calculating the joint moment resistance. Finally, the initial rotational stiffness, moment resistance, rotation capacity, and failure patterns are used to evaluate critically the accuracy of the predictions of the European design code. As a result, the need for more comprehensive design guidance in accordance with the observed findings is pointed out.