非平整曲面隔震结构的双自由度动力模型及地震响应研究  

Study on two-degree-of-freedom dynamic model and seismic response of uneven curved-surface isolated structure

作　　者：孙实 刘文光 田坤[1] 张杰 SUN Shi;LIU Wen-guang;TIAN Kun;ZHANG Jie(Department of Civi l Engineering,Shanghai University,Shanghai 200444,China)

机构地区：[1]上海大学土木工程系,上海200444

出　　处：《振动工程学报》2018年第5期780-788,共9页Journal of Vibration Engineering

基　　金：国家自然科学基金资助项目(51478257;51778355)

摘　　要：针对强地震作用下隔震结构隔震层变形过大的现象提出了曲面隔震结构体系,该结构隔震层为曲面布置,在地震作用和结构重力作用下上部结构可绕曲率中心进行曲面运动。建立了非平整曲面隔震结构双自由度动力分析模型,通过数值分析进一步研究非平整曲面隔震层的曲率半径对结构地震响应、受力特性的影响规律,确定非平整隔震层的合理曲率半径。采用钢框架模型结构进行了曲面隔震结构的地震模拟振动台试验,试验结果表明,非平整曲面隔震结构相比于普通隔震结构,上部结构加速度平均放大幅度略有增大,曲面隔震支座具有良好的滞回耗能能力,实现了隔震层位移响应和上部结构位移响应的有效控制。The deformation of isolation layer subjected to strong earthquake action is often excessively large.For this reason,the curved-surface isolated structural system is proposed,in which the isolation layer is uneven.In the curved-surface isolated building,the superstructure is able to pivot freely around the center of curvature due to the seismic and gravity effect.In this paper,a two-degree-of-freedom dynamic equation of the system is established first,and then the relationship between the curvature radius and the seismic response,mechanical behavior of the structure are studied through numerical analysis.Based on this study,the optimal curvature radius of the uneven isolation layer is determined.After that,a shake table test of the curved-surface isolated structure is performed using five-storey steel frame model.The results show that the average acceleration amplification factor of superstructure increases slightly compared to the conventional isolated structures.Meanwhile,a favorable energy dissipation capacity is observed for the isolator of the curved-surface isolated structure.Specifically,the displacement response of the isolation layer and the superstructure was effectively controlled.

关 键 词：曲面隔震结构 地震响应 振动台试验 双自由度 曲率半径 

分 类 号：TU352.12[建筑科学—结构工程] TU317.2