土-结构相互作用下考虑平摆耦合的基础隔震体系分析

Analysis of coupling effect of translation and rocking on base-isolated system considering soil-structure interaction

上部结构层间刚度相对较小、垂直荷载也较大的多层框架结构,其所采用的多层橡胶垫的橡胶总厚度较大,可能产生明显的竖向变形,导致结构摆动.基于锥体模型,用子结构法对基础隔震体系进行平摆耦合的结构模型分析,推导了在地震作用下结构平摆耦合的传递函数.研究结果表明,在硬土场地上,橡胶垫的竖向变形引起的摆动对基础隔震结构的地震响应有明显影响.

Multi-story frame structure, whose upper story rigidity is smaller, and with a bigger vertical load, when using multi-story packing rubber, the total thickness is bigger and possibly has an obvious vertical displacement which may cause rocking in structure. Based on the cone model, the coupled transfer function under seismic action is derived and the coupling effect on the base-isolated system is analyzed by the use of sub-structure method. The results show that the rocking phenomenon which caused by the vertical deformation of the rubber would have great effect on the based-isolated system in rigid site.