基础隔震结构连续性倒塌的非线性动力分析  

Nonlinear Dynamic Analysis of Progressive Collapse of Base-isolated Structure

作　　者：杜永峰[1,2] 谈志鸿 包超[2] 朱翔[2] 宋翔[2] 

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

出　　处：《工程抗震与加固改造》2015年第3期38-43,共6页Earthquake Resistant Engineering and Retrofitting

基　　金：国家自然科学基金资助项目(50978130;51178211)

摘　　要：基于备用荷载路径法,以基础隔震结构体系为研究对象,采用非线性动力分析方法分别对底层框架柱和隔震支座意外失效时剩余结构连续倒塌情况进行分析。同时,根据性能化设计评估方法 FEMA356中塑性铰力与位移关系曲线提出了反映受损结构抗倒塌性能的评价指标。研究表明,利用结构性能化指标可以较为准确地评判剩余结构的连续倒塌形态;且隔震支座失效对剩余结构造成的影响弱于底层框架柱失效所造成影响,但两种失效情况所引起剩余结构的响应趋势是一致的。Based on the alternate load path method, the analysis on progressive collapse of remaining parts of base-isolated structure is conducted using nonlinear dynamic method as the unexpected failure of the bottom column and isolation bearing occurred. Meanwhile, an evaluation indicator is proposed according to the force-displacement curve of plastic hinge in Federal Emergency Management Agency （FEMA356） , which aims to reflect the abilities to resist progressive collapse of damaged structure. The results show that the proposed indicator can evaluate the progressive collapse forms accurately and the isolation bearing failure has stronger influence on remaining structure than bottom column for base-isolated structure. However, the response trends of structure caused by the above two failure situations are consistent.

关 键 词：连续性倒塌 基础隔震结构 备用荷载路径 非线性 动力分析 

分 类 号：TU352.12[建筑科学—结构工程]