基于简化IDA的结构地震损伤评估方法  

SEISMIC DAMAGE ASSESSMENT PROCEDURE OF STRUCTURES BY USING SIMPLIFIED IDA

作　　者：王丰 李宏男[2] WANG Feng;LI Hong-nan(College of Civil Engineering,Dalian Minzu University,Dalian,Liaoning 116650,China;College of Civil Engineering,Shenyang Jianzhu University,Shenyang,Liaoning 110168,China)

机构地区：[1]连民族大学土木工程学院,辽宁大连116650 [2]沈阳建筑大学土木工程学院,辽宁沈阳110168

出　　处：《工程力学》2018年第12期194-202,共9页Engineering Mechanics

基　　金：国家自然科学基金项目(51478091);辽宁省自然科学基金项目(201602198);大连民族大学自主科研基金项目(wd01135)

摘　　要：将等效单自由度(SDOF)体系假设与Pushover分析方法相结合,建议了一种简化的增量动力分析(IDA)方法。给出损伤指数R与结构反应限值和抗震三水准的对应关系。根据结构抗震失效概率公式给出结构地震损伤概率计算方法,进一步得到结构在不同地震强度下的损伤指数期望值Re,用以评估结构的地震损伤等级。在此基础上建立了基于简化IDA的结构地震损伤评估方法。为了验证所提出的方法,按照不同场地设计了三幢结构模型,选取了典型地震动记录作为结构的水平地震动激励,对结构模型进行了IDA、地震易损性分析和地震损伤评估。通过算例分析表明,基于简化IDA的结构地震损伤评估方法计算量小,易于操作,但得到的结构损伤值较大,抗震评估结果偏于安全。A simplified incremental dynamic analysis （IDA） method is presented in which the assumption of equivalent SDOF system is combined with the method of Pushover analysis. The damage index R is defined, and the corresponding relationships between Re and the limits of structural response and aseismic three levels are proposed. The method for calculating seismic damage probability of structures is given according to the failure probability formula of structures, and the damage index expected value Re of the structure under different earthquake intensity is obtained, which can be used to evaluate the earthquake damage grade of structures. On this basis, a simplified IDA based method is established for evaluating seismic damage of structures. In order to verify the proposed method, three structural models are designed according to different soil sites, and typical earthquake records are selected as the horizontal ground motion excitation. Through the implement of IDA, seismic vulnerability analysis and earthquake damage assessment on the structure models are performed. The analysis results show that the method of seismic damage assessment based on simplified IDA performs a small amount of calculation, and is easy to operate, but the obtained damage values are relatively large and the results of seismic assessment are partial to safety.

关 键 词：增量动力分析 地震易损性分析 地震损伤评估 等效SDOF体系 层间位移角 

分 类 号：P315.9[天文地球—地震学] TU311.3[天文地球—固体地球物理学]