四肢钢管混凝土格构柱地震损伤模型及试验研究

Studies on seismic damage model of concrete-filled steel tube laced columns

为了评价巨型组合结构体系中钢管混凝土格构柱的地震损伤情况,对4根四肢钢管混凝土格构柱进行了拟静力试验,得出了四肢钢管混凝土格构柱在水平低周反复荷载作用下的水平荷载-位移滞回曲线、破坏特征和构件损伤情况。在试验所获得滞回曲线的基础上,通过对能量系数和耗能因子的修正,在传统双参数地震损伤模型基础上建立了适用于巨型组合结构体系中钢管混凝土格构柱的考虑无效耗能的双参数地震损伤模型,与试验结果相吻合。结果表明,修正后的模型能够较为准确地反映四肢钢管混凝土格构柱各位移阶段的损伤系数,为巨型组合结构体系中钢管混凝土四肢格构柱及其结构的地震损伤分析提供参考依据。

To evaluat the damage and aseismic performance of these concrete filled steel tubular(CFST)laced columns,four CFST laced columns consisting of four main steel-concrete tubes were tested under cyclic loading.In this paper,hysteresis and failure mechanisms were studied based on the results from the lateral cyclic loading tests.Besides,based on the hysteresis and skeleton curves obtained from the experiment,the traditional seismic damage double parameters model was revised.And a modified two-parameter seismic damage model,which is suitable for concrete filled steel tubular laced columns in a giant composite structure system,was established considering displacement damage and energy damage.The proposed modified seismic damage model is in good agreement with the test results,and it can be used for seismic damage analysis of the CFST four-limbed laced columns in the mega composite structure system.