基于可靠度的钢结构体系稳定设计方法  

Design Method for Steel Structures Based on Reliability Theory

作　　者：卢家森[1] 张其林[1] 

机构地区：[1]同济大学建筑工程系,上海200092

出　　处：《同济大学学报（自然科学版）》2005年第1期28-32,共5页Journal of Tongji University:Natural Science

摘　　要：基于可靠度的钢结构体系稳定设计理论 ,提出了通过抗力分项系数验算结构稳定性的方法 .在确定分项系数时 ,考虑了结构的材料和几何初始缺陷 ,使用基于响应面函数的蒙特卡罗模拟方法对结构进行二阶弹塑性分析 .通过 3个典型算例 ,比较了此方法与现有稳定设计方法所得结果 ,分析了现有稳定设计方法在不同情况下的误差及其原因 ,明确了计算长度方法和二阶弹性分析方法的适用范围 ,验证了此方法的正确性 .This paper develops the stability design method based on the reliability theory for steel structures.In this method the nonlinear analysis should be carried out and the system resistance factor of structures is suggested to check the stability of steel structures.The second-order inelastic analysis,considering material and geometric imperfections,is carried out to obtain the limit load,and the Monte Carlo simulation on the response surface is applied for the statistical study of the resistant factor.The errors and the corresponding reasons of the prevailing effective length method and the second elastic analysis method are carefully investigated through parameter studies on three examples,and their application limitations are clarified,and the reasonability of the stability design method for steel structures based on reliability theory is proven.

关 键 词：钢结构体系 可靠度 稳定设计 初始缺陷 二阶弹塑性分析 

分 类 号：TU311.2[建筑科学—结构工程]