抄録
Exterior columns in multi-story frames are subjected to bi-directional horizontal forces and variable axial force due to the overturning moment. In order to clarify the 3D collapse behavior of steel moment frames, it is necessary to simulate the behavior of RHS column including post-local-buckling and deterioration under bi-directional horizontal forces and variable axial force. In this study, a multi spring model, which consists of inelastic axial springs, was applied in the simulation. Based on the hysteretic model under constant axial force, the hysteretic model of axial springs under variable axial force was established. In addition, a series of cyclic loading tests on RHS columns under bi-directional horizontal forces and variable axial force was conducted. The simulated RHS column behavior agreed with the experimental results including the post-local-buckling and deterioration range.
