基于梁单元本构的钢管混凝土柱滞回性能分析

Analysis of Hysteretic Performance of Concrete-Filled Steel Tubular Column Based on Beam Element Constitutive Structure

目的:利用本课题组基于梁单元开发的混凝土和Abaqus自带钢材本构,分别对往复荷载作用下钢管混凝土柱是否考虑钢管对混凝土的约束进行有限元模拟,结果证明本课题组开发出的混凝土本构可以准确地描述钢管对混凝土的约束作用。在此基础上,分别采用三种钢材本构模拟与试验相同条件下的钢管混凝土柱,对比结果表明本课题组开发的钢材本构能够较好的反映钢管混凝土柱在低周往复荷载作用下的滞回性能以及耗能能力。结论:本课题组开发的混凝土、钢材本构模型能够用于钢管混凝土构件在复杂受力状态下的结构弹塑性地震反应分析。

Object:Based on the steel constitutive of concrete and Abaqus developed by our research group based on beam element,the finite element simulation was carried out on whether the constraint of steel tube on concrete was considered in the concrete filled steel tube column under the action of reciprocating load.The results showed that the concrete constitutive developed by our research group could accurately describe the constraint effect of steel tube on concrete.On this basis,three kinds of steel constitutions were used to simulate concrete-filled steel tube columns under the same conditions as the test.The comparison results show that the steel constitutions developed by our research group can better reflect the hysteretic performance and energy dissipation capacity of concrete-filled steel tube columns under the action of low cyclic reciprocating loads.Conclusion:The constitutive model of concrete and steel developed by our research group can be used to analyze the elastic-plastic seismic response of concrete-filled steel tubular(CFST)members under complex stress state.