四肢圆钢管混凝土格构柱恢复力模型研究

为了探究钢管混凝土格构柱的弹塑性地震反应以便进行构件非线性理论分析，对2根四肢圆钢管混凝土格构柱进行了低周反复加载试验，并收集了12根四肢圆钢管混凝土格构柱低周反复荷载作用下的试验资料。通过理论分析及试验结果回归分析，提出了钢管混凝土格构柱的退化三折线恢复力模型，确立了构件轴压比、等效长细比及材料比例系数等主要参数与模型之间的关系，并将模型计算结果与试验结果进行了对比分析。结果表明:计算结果和试验结果吻合较好，且该恢复力模型计算方法简单，便于进行结构地震反应分析及工程应用。

Study on Resilience Models of Circular Four-tube Concrete-filled Steel Tubular Laced Columns

In order to explore elastic plastic seismic response with the aim of component nonlinear theoretical analysis of concrete filled steel tubular laced column, two circular four tube concrete filled steel tubular laced columns were tested under low cyclic load, and the experimental results of twelve circular four tube concrete filled steel tubular laced columns under low cyclic load were collected. The degeneration three line resilience models of concrete filled steel tubular laced column was proposed through theory analysis and regression analysis of test results. The relationships between the model and the main parameters, such as axial compression ratio, equivalent slenderness ratio, material proportion coefficient, were established. Comparative analysis of the calculation results of model and the experimental curves was carried out. The result show that calculation results agree well with experimental results, and the calculation method of resilience model is simple. The resilience model proposed can be conveniently applied in structure seismic response analysis and engineering application.