设传力措施的巨型方钢管混凝土柱抗震性能有限元分析  

Finite element analysis on seismic performance of giant CFRT columns with load-transfer details

作　　者：张元植 ZHANG Yuanzhi(Sichuan Institute of Building Research,Chengdu 610081,China;College of Civil Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]四川省建筑科学研究院 [2]同济大学建筑工程系

出　　处：《建筑结构学报》2018年第11期20-28,共9页Journal of Building Structures

基　　金：国家自然科学基金项目(51208375)

摘　　要：为研究设有分配梁、内环板传力措施的巨型方钢管混凝土柱的抗震性能,以已有试验结果为基础,采用ABAQUS软件对巨型柱进行了有限元分析,计算得到的P-Δ滞回曲线和破坏模态等均与试验结果吻合良好,验证了有限元模型的合理性。在此基础上,以长细比、钢管宽厚比、轴压比及是否设置加劲肋等进行参数分析。分析结果表明：轴压比、钢管宽厚比是影响巨柱延性及耗能性能的关键因素;随着管壁宽厚比的增大,柱延性系数明显降低;随着轴压比的增加,其延性系数明显降低;在钢管壁上设置T形加劲肋后,有效改善了延性。通过分析传力构造的应力状态可知,分配梁与内环板相结合的传力措施能够有效保证低周反复荷载作用下巨型钢管混凝土柱的整体工作性能。In order to investigate the seismic performance of giant CFRT columns with load transfer details, the finite element software ABAQUS was utilized to conduct a finite element analysis based on the experimental results. It shows that the finite element analysis results, in terms of p-A curves and failure modes, agree well with the experimental results. Furthermore, a parametric analysis by ABAQUS was conducted. Different parameters including the slenderness ratio, width to thickness ratio of steel tube, axial compression ratio and the T-shaped longitudinal stiffeners were considered in the parametric analysis. It is shown that seismic behavior is mainly influenced by axial compression ratio and width to thickness ratio. The ductility index decreases with the increase of width to thickness ratio . The ductility index decreases with the increase of axial compression ratio. The ductility performance is improved after T- shaped stiffener is used. Finally, the stress distribution of load transfer details was analyzed. It can be concluded from the numerical stress analysis results that the details combining distributive beam with inner diaphragm can ensure the interactive performance of CFRT columns under reversed cyclic load.

关 键 词：巨型钢管混凝土柱 传力构造 T形加劲肋 有限元分析 抗震性能 

分 类 号：TU398.9[建筑科学—结构工程] TU311.4