钢框架结构地震响应与破坏过程的耐震时程分析  

Endurance Time Analysis of Seismic Response and Failure Process of Steel Frames Structure

作　　者：杨乐[1,2] 白久林[1] 欧进萍[1,3] 

机构地区：[1]哈尔滨工业大学土木工程学院,哈尔滨150090 [2]同济大学建筑设计研究院(集团)有限公司,上海200092 [3]大连理工大学建设工程学部,辽宁大连116024

出　　处：《防灾减灾工程学报》2014年第4期415-421,共7页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家自然科学基金项目(51261120376);教育部博士研究生学术新人奖(2012)资助

摘　　要：耐震时程法(ETM)是一种基于动力时程的结构抗震分析方法,其典型表征在于随着持续时间的增加,地震动强度逐渐增大。本文合成了基于中国抗震反应谱的耐震时程曲线,并以此作为输入,对一个8层3跨钢框架结构的抗震性能进行了分析和评估。采用增量动力分析方法(IDA)对结构在不同耐震持时下的整体响应进行了评估;以大震下天然地震动分析结果为标准,对比了结构在耐震时程曲线(ETA)作用下的塑性铰分布概率、形成顺序和延性分布。研究结果表明:耐震时程法能较好地预测钢框架结构的非线性动力响应及破坏过程,且分析次数少,这为钢框架结构的抗震性能快速分析与评估提供了一种新的手段。Endurance time method （ETM） is a dynamic time history-based approach to structural seismic response analysis, which has the characteristic that the ground motion intensity increases with time. In the present study, endurance time accelerograms（ETAs） were developed based on Chinese code response spectrum, and applied on an 8-story 3-bay steel frame structure to evaluate the seismic performance. The structural global response due to ETAs was assessed through in- cremental dynamic analysis （IDA）. Using the response of the structure subjected to real severe ground motions as reference, the probability of occurrence, yielding sequence and rotation ductili- ty ratio of plastic hinges for ETM, were compared. The analytical results indicate endurance time method, with less time-consuming, has an excellent potential to predict the nonlinear response of steel frames structure, which provides a novel approach to quickly analyze and evaluate the seis- mic performance of steel frame structure.

关 键 词：耐震时程法(ETM) 钢框架结构 耐震时程曲线(ETA) 规范反应谱 增量动力分析(IDA) 抗震性能 

分 类 号：TU352.1[建筑科学—结构工程]