屈服强度550MPa高强冷弯薄壁型钢结构轴心受压构件可靠度分析  

Reliability analysis of 550MPa high-strength cold-formed thin-walled steel structures

作　　者：沈祖炎[1] 李元齐[1] 王磊[1] 王彦敏 徐宏伟[3] 

机构地区：[1]同济大学,上海200092 [2]博思格建筑系统,上海201613 [3]宝山钢铁股份有限公司,上海201900

出　　处：《建筑结构学报》2006年第3期26-33,41,共9页Journal of Building Structures

摘　　要：本文采用二阶矩概率法,考虑强度、截面几何参数、计算模式、外荷载等不定因素的影响,针对屈服强度550MPa高强冷弯薄壁型钢轴心受压构件的可靠度进行了分析,并考虑材料特性,在已有试验的基础上对其承载力计算方法、目标可靠指标及强度设计指标的合理选取进行了研究。结果表明,在按厚度分类合理确定高强冷弯薄壁型钢的强度设计指标后,可依据现行的《冷弯薄壁型钢结构技术规范》(GB 50018—2002)给定的考虑板组稳定计算截面有效宽厚比的方法对其轴心受压构件的极限承载力进行有效分析,并满足预定设计可靠指标的要求。In this paper, considering the effects of the variations from strength, geometrical parameters of sections, analysis method and external loadings, the second-order moment probability method is used for conducting reliability analysis of 550MPa high-strength cold-formed thin-walled steel structures. From which the reasonable design method for the load-carrying capacity of axial-compression members, targeted reliability index, and the corresponding design strength level are studied, considering the material characteristics of the high strength steel, The results show that, with reasonable determination of the design value of material strength of the high-strength cold-formed thin-walled steel sections according to their thickness, the effective width-to-thickness ratio method, considering coupling stability of plates provided by＂Technical code of cold-formed thin-walled steel structures＂ （GB 50018--2002） can be efficiendy used to estimate the load-carrying capacities of axiallycompressed elements of the high-strength cold-formed thin-walled steel structures, and well satisfy the targeted reliability index in structural design.

关 键 词：高强冷弯薄壁型钢结构 可靠指标 抗力分项系数 板组稳定 有效宽厚比 

分 类 号：TU392.1[建筑科学—结构工程] TU318.1