异形柱框架抗震性能研究及有限元分析

Research on seismic behavior and nonlinear finite element analysis of frame with specially shaped columns

在钢筋混凝土异形柱框架低周反复荷载试验分析的基础上,研究了该类型结构的破坏特征、承载能力、变形能力和延性等抗震性能指标,根据框架顶层滞回曲线得到相应结构的恢复力模型,通过计算等效刚度对比分析了结构各层刚度退化曲线,最后应用有限元软件对该框架进行了非线性有限元分析。研究结果表明:该框架结构抗震性能良好,但底层柱脚及部分节点破坏严重,成为结构的薄弱部位,应予以重视,异形柱框架单向承载力有限元分析与该结构骨架曲线吻合良好。

Based on experiment analysis of RC frame with specially shaped columns under low frequency cyclic loading,the seismic behavior of the frame about damage characteristic,bearing capacity,deformation capacity and displacement ductility etc.were researched,the restoring force model of the frame was obtained based on the study of the top hysteresis curve measured in experiment,and the stiffness degeneration characteristics of every story of the frame was analyzed,and the nonlinear finite element of the frame was analyzed at last.It is shown that the seismic behavior of this structure is generally good,but the bottom of first floor columns and some joints show seriously failure,become weak part of the structure,which should receive attention.The nonlinear finite element analysis of the frame under single way loading is in good agreement with the skeleton curve of the structure.