基于概率的钢框架结构地震失效模式识别方法  

PROBABILITY-BASED SEISMIC FAILURE MODES IDENTIFICATION METHOD FOR STEEL FRAME STRUCTURE

作　　者：徐龙河[1] 吴耀伟[1] 李忠献[2] 

机构地区：[1]北京交通大学土木建筑工程学院,北京100044 [2]天津大学滨海土木工程结构与安全教育部重点实验室,天津300072

出　　处：《工程力学》2016年第5期66-73,共8页Engineering Mechanics

基　　金：国家自然科学基金项目(51322806;51578058);中央高校基本科研业务费项目(2014JBZ011);国家重点基础研究发展计划(973计划)项目(2011CB013603;2011CB013606)

摘　　要：该文定义了构件的截面损伤指标,基于增量动力分析(IDA)方法,对地震输入下结构的失效模式进行分类,进一步统计得出各失效模式下构件端部截面损伤均值。提出基于概率的地震失效模式识别方法,建立各失效模式下结构失效概率关系表达式。基于OpenSees平台,对一个20层benchmark钢框架结构模型进行数值分析,结果表明,根据关键层的损伤状态可以合理地划分失效模式,引入构件重要性系数能较好地反映各构件截面损伤对结构失效模式的影响,基于概率的地震失效模式识别方法能有效的判别结构发生各失效模式的概率大小。The section damage index of a structural component is defined, and based on the incremental dynamic analysis（IDA） method, the failure modes of a structure due to earthquakes are classified to further statistically calculate the mean values of component section damage under different failure modes. A probability-based seismic failure-modes identification method is proposed to establish the structural failure probability formula under different failure modes. As a numerical example, a 20-story benchmark steel frame structure is analyzed based on Open Sees platform. The results indicate that： structural failure modes can be reasonably classified according to the damage states of key floors, the effects of the component section damage on structural failure modes can be well reflected by the introduction of component importance coefficients, and the occurrence probability of different failure modes can be effectively distinguished by the probability-based seismic failure modes identification method.

关 键 词：钢框架结构 失效模式识别 截面损伤指标 增量动力分析 截面曲率 概率 

分 类 号：TU391[建筑科学—结构工程]