组合基础隔震结构双向地震反应分析

本文采用双向耦合恢复力模型模拟组合隔震系统中隔震支座的双向耦合效应,对组合基础隔震结构进行了单向和双向地震反应对比分析,分析表明在水平双向地震作用下结构各层的加速度反应较小,隔震层的层间位移较大,而上部结构的层间位移较小,并且在水平双向地震作用下,支座的最大位移明显大于单向地震作用时支座的最大位移,因而应考虑水平双向地震作用对组合基础隔震结构地震反应和隔震支座性能的影响。

Analysis of seismic responses for base-isolated structures with combined isolation system under bilateral ground excitation

A bilateral coupled restoring force model is used to simulate the bilateral coupled effect of the bearings of combined isolation system.The comparative analysis of unilateral and bilateral seismic responses of base-isolated structures with combined isolation system is carried out.It is found that under the bilateral ground excitation the accelerations of each floor are smaller,the inter-floor displacement of isolation layer is larger,the inter-floor displacements of super-structure are smaller,and the maximum displacement of the bearings under bilateral components is much larger than that under unilateral component.So the influence of bilateral ground excitation on the seismic responses of base-isolated structures and the performance of bearings should be considered.