全过程火灾作用下钢管混凝土柱-钢梁连接节点的受力全过程分析

his paper performs a full-range analysis on concrete filled steel tube (CFST) column to restrained steel beam joints subjected to combined initial load and heating and cooling fire. A finite element analysis (FEA) model is established to simulate the CFST column to restrained steel beam joint with considering the influence of the slippage between steel beam and RC slab and the high-temperature creep of steel. Based on the FEA model, failure modes, deformations, internal forces and moments of this type of joint in the entire phase, including ambient tempearature loading, heating, cooling and post-fire loading, are analyzed. Finally, joint moment versus relative rotation angle full-range relation curve of the composite joints is calculated, and parameter analysis is performed to investigate the influence of various factors on post-fire residual load bearing capacity index of the joint.