近断层地震作用下隔震结构基底碰撞响应分析及倾覆倒塌模拟  

Overturning collapse simulation of isolation structure under near-fault seismic motion considering potential pounding

作　　者：杜永峰[1,2] 王小虎[1] 朱翔[1] 

机构地区：[1]兰州理工大学防震减灾研究所,兰州730050 [2]西部土木工程防灾减灾教育部工程研究中心,兰州730050

出　　处：《建筑结构》2013年第2期56-59,共4页Building Structure

基　　金：国家自然科学基金(50978130)

摘　　要：近断层脉冲型地震作用下,建筑的隔震层会产生较大的侧移,与周边基坑挡墙可能发生碰撞。采用非线性弹簧来模拟基坑挡墙,考虑上部结构的弹塑性变形。利用基于非线性弹簧的碰撞模型,分析了近场、远场地震作用下隔震结构的碰撞响应,探讨了隔震结构与周边基坑的预留间距对隔震结构碰撞的影响。并通过二次开发,采用生死单元法,模拟了碰撞导致隔震结构的倾覆倒塌。基于增量动力分析(IDA)的分析结果表明:近场地震作用下隔震结构更容易发生碰撞,对隔震结构的倾覆效应更具相关性,碰撞导致隔震支座产生受拉破坏继而发生倾覆倒塌。The isolation story will have a greater deformation,potential pounding may occur at the isolation level between the building and its surrounding retaining walls under the near-fault pulse-type seismic motion.Non-linear springs were employed to simulate the impact of the boundary,and elastic-plastic deformation of the upper structure was also considered.The pounding response of the isolation structure under near-fault and far-fault seismic and the impacts of the pounding under different tectonic space were studied by the collision model based on non-linear springs.Through ＂birth-death＂ element defined in the user＇s subroutine,collapse leaded by pounding was simulated.The Incremental Dynamic Analysis（IDA） result shows that structures under near-fault seismic are more likely to crash compared with far-fault seismic,and it is more relevant with overturning of isolation structure.Simulation results show that pounding lead to isolation bearing damage and subsequent overturning collapsed.

关 键 词：近断层地震 隔震结构 碰撞响应 倒塌模拟 增量动力分析 

分 类 号：TU352.12[建筑科学—结构工程]