Seismic performance of weak-beam-type steel low-to-middle-rise moment-resisting frame determined by local buckling of square hollow section columns

Abstract

This study performed incremental dynamic analyses to investigate the relationship between the seismic performance and deformation capacity of the column of weak-beam-type steel moment-resisting frames (MRFs) with square hollow section (SHS) columns. A hysteresis model that accurately simulates the local buckling cyclic behavior was used for the analysis. From analytical results, a relationship between the required strength of the weak-beam-type steel MRFs and the width-to-thickness ratio of the SHS columns was obtained. Also, safety margin of MRFs up to collapse was evaluated in the relationship with the width-to-thickness ratio of the SHS column.