型钢-钢管混凝土压弯构件的恢复力特性

摘要

基于钢管混凝土滞回曲线计算方法,采用纤维模型法建立了型钢-钢管混凝土压弯构件滞回曲线的计算方法;计算中采用Mander模型的混凝土加卸载规则;钢材的滞回模型中考虑了包辛格效应.纤维模型计算结果与试验结果吻合较好.在纤维模型的基础上进行了参数分析,分析了轴压比和循环荷载对构件力学性能的影响.%Experimental results showed that the seismic behavior of SRC-filled tube beam-columns was excellent.The analysis method on the cyclic responds of SRC-filled tube beam-columns was not reported at present.The fiber model analysis method on the SRC-filled tube beam-columns was suggested in this paper based on the fiber model analysis on CFT beam-columns.Mander's model for confined concrete and a Bausinger effect included cyclic steel model were employed in the fiber model.The results from fiber model compare favorably with the experimental results.Parameters of SRC-filled tube beam-columns were analyzed,and the effects of axial load ratio and cyclic load were investigated with fiber model.