摘要
基础隔震结构在罕遇地震作用下可以大幅降低上部结构的地震响应,达到保护结构的目的;但在超过罕遇地震的强震作用下,隔震层位移可能超过预留的隔震沟宽度,隔震结构与周边挡土墙碰撞。建立考虑上部结构非线性的隔震结构模型,设防烈度为8度,进行了超过罕遇地震的强震下地震响应分析,结果表明,隔震结构与挡土墙碰撞减小了隔震层位移,但导致上部结构加速度、位移及层剪力明显放大,放大程度随碰撞刚度及地震动强度的增大而增大,随隔震沟宽度的增大而减小;碰撞刚度增大到一定程度后,层间位移的增大对碰撞刚度的增大不再敏感,加速度及上部结构基底剪力系数则未表现出这一趋势;碰撞还导致支座最大面压的增大及最小面压的减小。
The base isolated structures can greatly reduce the seismic response of the superstructure and protect the structure under rare earthquakes. However, under strong earthquakes exceeding rare earthquakes,displacement of the isolation layer may exceed the width of the isolation trench, causing impact between isolated structure and retaining wall. A base isolated structure model considered the nonlinearity of the superstructure is established. The fortification intensity is 8. The seismic response under strong earthquakes exceeding rare earthquakes is analyzed. The results show that the impact between isolated structures and retaining wall decreases the displacement of the isolation layer. The acceleration, story drift and story shear force of the upper structure are obviously enlarged, which increases with the increase of impact stiffness and ground motion intensity, and decreases with the increase of the width of isolation trench. When the impact stiffness increases to a certain extent, the increase of the interlayer displacement is no longer sensitive to the increase of the impact stiffness, but the acceleration and story shear force of the superstructure do not show this trend. In addition, the collision causes the maximum compressive pressure of the bearing to increase and the minimum compressive surface pressure to decrease.
作者
金建敏
肖骥
陈鹏
谭平
刘彦辉
JIN Jianmin;XIAO Ji;CHEN Peng;TAN Ping;LIU Yanhui(Earthquake Engineering Research &Test Center,Guangzhou University,Guangzhou 510405,China;Guangdong Provincial Key Laboratory of Earthquake Engineering and Applied Technology,Guangzhou 510405,China;Key Laboratory of Earthquake Resistance,Earthquake Mitigation and Structural Safety,Ministry of Education,Guangzhou 510405,China)
出处
《华南地震》
2018年第4期74-83,共10页
South China Journal of Seismology
基金
国家自然科学基金(51468050
51778163)
广东省教育厅创新团队项目(2016KCXTD016)
广州市科技计划项目(20170710333)
关键词
强震
基础隔震结构
碰撞
响应
Strong earthquake
Base isolation structure
Impact
Response
