分安全系数法在管道结构强度中的应用研究  

Application of partial safety factor method on the pipe structural strength

作　　者：王伟[1] 钟万里[1] 李文胜[1] 刘长虹[2] 

机构地区：[1]广东电网公司电力科学研究院,广东广州510080 [2]华东理工大学承压系统与安全教育部重点实验室,上海200237

出　　处：《广西大学学报（自然科学版）》2013年第5期1074-1078,共5页Journal of Guangxi University（Natural Science Edition）

基　　金：国家"863"计划项目(2009AA044803);国家自然科学基金资助项目(50835003);南方电网公司科技项目(K-GD2012-379)资助

摘　　要：为了研究管道结构强度设计中确定分安全系数问题,提出一种确定分安全系数的新计算模型。在已知极限状态方程时,如果是正态分布随机变量,可以采用一次二阶矩法计算出相关的设计点,如果随机变量中有非正态分布随机变量,则需要采用等效正态变化的一次二阶矩法计算,然后确定出参数相应的分安全系数。对于更为复杂而无法确定极限状态方程情况下,则可以首先利用蒙特卡洛有限元方法和概率统计方法计算,确定出结果响应的随机分布性质,然后再根据抗力和载荷效应极限状态方程确定分安全系数。为验证模型的有效性,文中给出了算例,其中对一个管道的分安全系数的计算结果,与前人用非线性有限元法计算的结果一致。To determine the partial safty factors for strength design of pipeline structures, a new cal- culation model for determining the partial safety factor is proposed. If the limit statement equation is known and random variables are in the naormal distribution, the first order and second moment （FOSM） can be used to calculate the relevant design. If a set of random variables contains non-nor- mally distributed random variables, equivalent normal transform could be done by useing a second- order moment method to determine the parameters of appropriate safety factors. For the complex con- dition in which it is unable to determine the limit statement equation, the Monte Carlo finite element method and probabilistics could be applied to determie the randomly distributed nature of response parameters, then partial safety factors be calculated based on the resistance and load limit statement equation. To verify the validity of the proposed model, practical examples are given. For a pipe structure, the partial safety factors calculated is in good agreement with the conclusion using nonlin-ear finite element analysis.

关 键 词：分安全系数 可靠性 随机变量 结构强度 

分 类 号：TH123[机械工程—机械设计及理论]