装配式预制混凝土框架结构地震反应分析

Seismic response analysis of a jointed precast concrete frame structure

采用梁单元和Takeda恢复力模型模拟梁、柱,采用转动弹簧-阻尼单元和非线性弹性恢复力模型模拟装配式节点,对一个装配式预制混凝土框架结构进行了非线性动力时程分析并与拟动力试验进行了对比.采用多工况地震波串联进行一次"长加载"的计算方法研究了结构损伤累积对地震反应的影响.结果表明:数值仿真与试验结果吻合较好,最大位移相差在15.5%以内;在加载幅值逐级增大情况下,损伤累积仅对各工况开始阶段有较大影响,对结构反应峰值影响在5%以内.

A nonlinear, transient dynamic analysis was performed as a pseudo-dynamic test of a jointed precast concrete frame structure. In these calculations beams and columns were simula ted by beam elements and a Takeda restoring force model. The beam to column connections were simulated by spring/clamp elements in nonlinear elastic restoring force model. A numeri- cal simulation employing series connected earthquake waves was used to estimate the effects from cumulative damage. The results show that the numerical simulation predicts values close to the test results： The differences between tests and calculations are less than 15.5~//oo. The effect of cumulative damage to the earthquake response is only distinct at the beginning of each test and becomes indistinguishable （less than 5 ~//00） when the earthquake waves increase to the peak.