第39卷第1期2023年2月结构工程师StructuralEngineersVol.39,No.1Feb.2023冷弯薄壁型钢轴压构件整体稳定承载力的概率分布徐迟1李杰1,2,*(1.同济大学建筑工程系,上海200092;2.同济大学土木工程防灾国家重点实验室,上海200092)摘要对冷弯薄壁型钢轴压构件整体稳定承载力的统计特征进行了量化描述,选择屈服强度和偏心距为基本随机变量,确定其数字特征和概率分布;基于Perry公式研究了随机性的传递过程,给出了稳定承载力的数字特征与概率分布规律。理论分析结果与试验结果进行对比,结果表明采用随机性的传播方法可以预测整体稳定承载力的统计特征。关键词冷弯薄壁型钢,稳定承载力,随机性,均值,标准差,概率密度函数ProbabilityDistributionofGlobalStabilityBearingCapacityofCold-FormedThin-WallSteelMembersunderAxialCompressionXUChi1LIJie1,2,*(1.DepartmentofBuildingEngineering,TongjiUniversity,Shanghai200092,China;2.StateKeyLaboratoryofDisasterReductioninCivilEngineering,TongjiUniversity,Shanghai200092,China)AbstractInthispaper,thestatisticalcharacteristicsoftheglobalstabilitybearingcapacityofcold-formedthin-wallsteelmembersunderaxialcompressionaredescribedquantitatively.Firstly,theyieldstrengthandeccentricityareselectedasbasicrandomvariables.Thentheirnumericalcharacteristicsandprobabilitydistributionsaredetermined.BasedonPerryformula,thetransferprocessofrandomnessisstudied.Afterward,thenumericalcharacteristicsandprobabilitydistributionlawofstabilitybearingcapacityaregiven.Thecomparisonbetweentheanalyticalresultswithtestresultsindicatesthatthestatisticalcharacteristicsoftheglobalstabilitybearingcapacitycanbepredictedthroughtherandomnesspropagationmethod.Keywordscold-formedthin-wallsteel,stabilitybearingcapacity,randomness,mean,standarddeviation,probabilitydensityfunction0引言我国《冷弯薄壁型钢结构技术规范》(GB50018—2002)(以下简称“规范”)[1]中给出了轴心受压构件的稳定系数。这些系数是根据Perry公式[2]和试验拟合得到的。在此基础上基于164个轴心受压构件的稳定试验结果对初始偏心率的计算进行了调整,形成了87版规范中的稳定系数,并沿用至今[3-5]。事实上,冷弯薄壁型钢轴压构件整体稳定承载力(...