半刚接钢框架系统刚度可靠性对随机变量的敏感性分析  

Sensitivity Analysis of System Stiffness Reliability of Semi-rigid Steel Frames to Random Variables

作　　者：侯颖[1] 霍达[1] 腾海文[1] 张杨[1] 

机构地区：[1]北京工业大学建工学院,北京100124

出　　处：《工程抗震与加固改造》2010年第2期20-24,共5页Earthquake Resistant Engineering and Retrofitting

基　　金：国家自然科学基金(50378007)

摘　　要：本文将梯度优化法与有限元法相结合,研究了结构失效模式可靠度对隐式随机变量的敏感性,并用PNET法分析了结构系统刚度可靠度对随机变量的敏感性。通过三个算例,对影响半刚接钢框架系统刚度可靠度的多个随机变量进行了敏感性分析,结果表明:在中高层钢框架中,结构系统刚度可靠度对连接刚度Rk的均值敏感性更为显著,而对其变异系数和分布类型的敏感性较小,在结构设计中应慎重考虑。Gradient optimization method is combined with finite element method in the paper. Sensitivity of structural failure modes to implicit random variables is studied and the PNET method is adopted to analysis sensitivity of structural system stiffness reliability to random variables. By three examples, sensitivity of system stiffness reliability of the semi-rigid steel frames to several random variables is analyzed. The results show that sensitivity of structural system stiffness reliability to the mean value of connection stiffness is more remarkable in the medium, high storey steel frames, but sensitivity of its variation coefficient and distribution type is little remarkable, so it is required careful consideration in structure design.

关 键 词：半刚性节点 钢框架 系统可靠性 敏感性分析 随机有限元 

分 类 号：TU391[建筑科学—结构工程] TU311.2