Performance evaluation of 2-d moment frames with high strength steel end-plate connections

Abstract

The structural use of high strength steel (HSS) provides numerous advantages. Hence HSS became more widely used in recent years. However, so far, there has been limited research on the behaviour of HSS beam to column connections and their effect on the performance of structures. This study aims at investigating the performance of 2-D moment frames using HSS end-plate beam to column connections in terms of strength, stiffness and ductility. The results of this study were compared with those of similar frames using mild steel end-plate connections. For this purpose, FEM was used to validate the experimental results available from past research on HSS end-plate connections. Through this approach the moment curvature relationships were captured for the purpose of finding hinge properties. Time-history (non-linear dynamic) analysis was carried out according to FEMA 356 to determine the global inelastic response of 2-D moment frames. It is found that the usage of HSS would allow the use of a thinner end-plate without compromising the frame seismic behaviour. However, the minimum thickness for the HSS end-plate may need to be determined to avoid buckling instability of the frame.