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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。
In order to investigate the elasto-plastic seismic response of CFST latticed columns for non-linear theoretical analysis of components, low-cycle cyclic loading tests on two CFST columns with four extremities were performed. Twelve CFST columns Low cycle repeated load test data. Through the theoretical analysis and the regression analysis of the test results, a regression model of the degenerate tri-fold line of the CFST latticed column is proposed. The relationship between the model parameters and the main parameters such as axial compression ratio, equivalent slenderness ratio and material proportionality coefficient is established. The results of model calculation and experimental results are compared and analyzed. The results show that the calculated results are in good agreement with the experimental results, and the calculation method of the restoring force model is simple and convenient for seismic response analysis and engineering application.