高强冷弯矩形钢管混凝土柱抗震性能非线性有限元分析

Non-linear finite element analysis of seismic behavior of concrete-filled high strength cold-formed rectangular steel tubular columns

基于试验结果,采用OpenSEES有限元软件模拟高强冷弯矩形钢管混凝土柱在低周往复荷载作用下抗震的受力全过程。分析试验构件的滞回性能,并基于纤维模型理论数值计算方法对高强矩形冷弯钢管混凝土的骨架曲线进行理论计算。探讨了截面长宽比、钢管的宽厚比、轴压比对高强冷弯矩形钢管混凝土柱的力学性能的影响。结果表明:采用OpenSEES计算得到的滞回曲线、骨架曲线与试验实际滞回曲线、骨架曲线吻合较好;在一定范围内,高强冷弯矩形钢管混凝土柱的截面长宽比越小,其水平承载力和刚度越大;钢管宽厚比减小可有效提高高强冷弯矩形钢管混凝土柱的水平承载力和刚度;轴压比越小,高强冷弯矩形钢管混凝土柱水平承载力越高且延性越好。

Based on the experimental results,OpenSEES finite element software is used to simulate the entire process of concrete-filled high-strength cold-formed rectangular steel tube columns subjected to low-cycle reciprocating load.The hysteretic behavior of the experimental components was analyzed,and the theoretical calculations of the concrete-filled high-strength rectangular cold-formed steel tube skeleton were theoretically calculated based on the fiber model theoretical numerical calculation method.The effects of long-width ratio of section,width-thickness ratio of steel tube and axial compression ratio on the mechanical properties of concrete-filled high-strength cold-formed rectangular steel tubular columns were discussed.The results show that the hysteresis curve and skeleton curve calculated by OpenSEES agree well with the actual hysteretic curve and skeleton curve of the test.Within a certain range,the smaller of the cross-sectional aspect ratio of the concrete-filled high-strength cold-formed rectangular steel tube column,the greater the bearing capacity and rigidity.The reduce of the width-thickness ratio of the steel tube can effectively improve the horizontal bearing capacity and stiffness of the concrete-filled high-strength cold-formed rectangle steel tubular column.The smaller of the axial compression ratio,the higher of the horizontal bearing capacity and the better of the ductility of the concrete-filled high-strength cold-formed rectangular steel tube column.