单向偏心结构的简化增量动力分析方法  

SIMPLIFIED INCREMENTAL DYNAMIC ANALYSIS METHOD FOR UNIAXIAL PLAN-ASYMMETRIC STRUCTURES

作　　者：李宁 翟长海[2] 谢礼立[2,3] 

机构地区：[1]天津大学建筑工程学院/滨海土木工程结构与安全教育部重点实验室(天津大学),天津300072 [2]哈尔滨工业大学土木学院,哈尔滨150090 [3]中国地震局工程力学研究所,哈尔滨150080

出　　处：《工程力学》2011年第5期8-12,共5页Engineering Mechanics

基　　金：国家自然科学基金项目(90815014;90715021)

摘　　要：增量动力分析方法(IDA)可以较为全面的评估结构的抗震性能,但需对结构进行大量的非线性时程分析,计算量巨大。该文将单向偏心结构的等效二自由度模型(EDDOF)应用于增量动力时程分析,提出了单向偏心结构的简化增量动力分析方法。然后选取20条实际地震记录和一栋5层偏心结构,基于等效二自由度模型和原型模型分别进行了增量动力时程分析,并比较分析了对应的IDA曲线和易损性曲线。结果表明:该文方法对单向偏心结构抗震性能评估有较高的精度,可以追踪结构从弹性阶段到防止倒塌各阶段的性态变迁全过程,并进行定量评估,且计算效率大幅提高。The incremental dynamic analysis（IDA） method is a good tool to evaluate the seismic performance of structures.However,it is computationally expensive to conduct inelastic dynamic analysis.In this study,a simplified incremental dynamic analysis method is proposed for the seismic evaluation of plan-asymmetric structures by introducing the equivalent dual degree of freedom（EDDOF） model into the process.With 20 ground motions and a 5-story plan-asymmetric frame structure,the incremental dynamic analysis is performed based on the original structures and the corresponding EDDOF system.The IDA curves and the collapse fragility curves are compared for the two methods.It can be concluded that the simplified IDA method is reliable and effective for evaluating the seismic performance of uniaxial plan-asymmetric structures from elastic behavior to global dynamic collapse.And the proposed procedure also has good efficiency.

关 键 词：扭转反应 增量动力分析 性态评估 偏心 模态PUSHOVER 

分 类 号：TU311.3[建筑科学—结构工程]