基于滞回耗能的钢-混凝土组合框架抗震性能分析

Analysis on seismic behavior of steel-concrete composite frame structure based on hysteretic energy

基于能量抗震设计方法对某三层两跨钢-混凝土组合框架进行有限元动力时程分析。根据现有实验得出的简化适合组合结构刚度退化三线型恢复力模型,建立组合框架的能量反应公式,利用有限元软件模拟组合框架在地震荷载下的动力响应。综合考虑地震动三要素和结构的自身动力特性,通过对结构的地震反应能量计算,分析组合框架在地震荷载下滞回耗能层间的滞回能量分配及受各种因素影响的具体变化耗散规律。对比钢筋混凝土框架的滞回耗能分析,结果表明组合框架具有更强承受大震的耗能能力,同时为组合框架在预测地震可能发生时的抗震性能分析提供理论依据。

One steel-concrete composite frame structure,which had three-storey ＆ two-span was analysised according to the nonlinear clynovmic time history based on the design method of seismic energy.According to the tri-linear restoring force model with consideration of rigidity degradation which can be applied in composite structure,based on the seismic energy formula of CFS,the dynamic response of the frame under earthquake load was analysed by finite element software.Total input seismic energy,hysteretic dissipated energy and daming energy can be obatained.It is shown that the laws of storey distribution of hysteretic energy for CFS and structure dynamic parameters have great effects on the laws,and it is concluded that CFS has reliable capacity of energy-absortion contrasted to the hysteretic energy of RC frame structure and it is helpful to offer theory reference for CFS to forecast earthquake response.