基于性能的钢框架结构失效模式识别及优化  

PERFORMANCE-BASED SEISMIC FAILURE MODE IDENTIFICATION AND OPTIMIZATION FOR STEEL FRAME STRUCTURES

作　　者：徐龙河[1] 吴耀伟[1] 李忠献[2] 滕军[3] 

机构地区：[1]北京交通大学土木建筑工程学院,北京100044 [2]天津大学建筑工程学院,天津300072 [3]哈尔滨工业大学深圳研究生院,深圳518055

出　　处：《工程力学》2015年第10期44-51,共8页Engineering Mechanics

基　　金：国家自然科学基金项目(51322806);中央高校基本科研业务费项目(2014JBZ011)

摘　　要：该文定义了损伤和滞回耗能两个性能指标,以增量动力分析(IDA)方法为基础,提出基于性能的钢框架结构失效模式识别方法,并以性能指标为目标函数,以构件截面尺寸作为变量,建立钢框架结构失效模式多目标优化方法。在多条地震波作用下,对一个20层benchmark钢框架结构进行了失效模式识别与优化分析,结果表明,以损伤和滞回耗能作为评价指标的基于性能的钢框架结构失效模式识别方法,能有效识别最不利地震作用下的结构失效模式,基于性能的失效模式多目标优化方法能够显著提高结构整体的抗震性能。Two performance indices, i.e. damage index and hysteretic energy dissipation index, are defined in this paper, and the performance-based structural failure mode identification method for steel frame structures is proposed based on the incremental dynamic analysis （IDA） method. The multi-objective optimization method of structural failure modes is developed using those two performance indices as the objective function and the section dimension of members as the variables. A numerical example of a 20-story benchmark steel frame structure is analyzed to identify and optimize its failure modes subjected to various earthquakes. Results indicate that the failure mode of structure subjected to the most unfavorable earthquake can be effectively identified through the performance-based identification method using the damage and hysteretic energy dissipation indices as evaluation functions, and the seismic behaviors of structure can be significantly improved by the performance-based multi-objective optimization method.

关 键 词：钢框架结构 失效模式识别 增量动力分析 性能指标 多目标优化 

分 类 号：TU352[建筑科学—结构工程]