首页 | 本学科首页   官方微博 | 高级检索  
     

改进的一次二阶矩法在隧道可靠度中的应用
作者单位:中冶集团建筑研究总院 北京100088(吴雪莉,姜进),中国矿业大学(北京)力学与建筑学院 北京100083(张乐民,余明辉,耿慧辉)
摘    要:在隧道衬砌结构可靠度分析中,基于一次二阶矩中心点法在基本变量的概率分布若为非正态分布或为非对数正态分布以及结构功能函数为非线性函数时,中心点法计算结果与实际出入较大。通过引入分离函数式对一次二阶矩法进行的线性化处理,结合蒙特卡罗-有限元法计算荷载作用效应的统计特征,从设计验算点开始进行迭代,并利用Mathematica辅助编程对隧道结构可靠度指标进行求解。计算结果表明:改进一次二阶矩法与分位点法相比具有更令人满意的精度,实用性好,适用于隧道及地下工程结构的可靠度分析。

关 键 词:可靠度  改进一次二阶矩法  分离函数式  蒙特卡罗-有限元  隧道衬砌

APPLICATION OF THE IMPROVED FIRST ORDER SECOND MOMENT METHOD(FOSM) IN TUNNEL RELIABILITY
Wu Xueli Jiang Jin. APPLICATION OF THE IMPROVED FIRST ORDER SECOND MOMENT METHOD(FOSM) IN TUNNEL RELIABILITY[J]. Industrial Construction, 2008, 0(Z1)
Authors:Wu Xueli Jiang Jin
Abstract:In the reliability analysis of tunnel lining structures,it has a large distinctness between the results calculated by central point method and actual values when probability distributions of basic variables are not subjected to normal distribution or lognormal distribution and the performance functions are nonlinear.It is suggested that FOSM method is linear improved by introduced separation function,and combined with the statistical characteristics of action effect calculated by Monte-Carlo FEM,to solve the problem by an projection iteration method beginning from the designing check point.This method solves tunnel lining reliability index through programming under the assistant of Mathematica.Compared with the method for quantile,result shows that this method is a satisfactory approximation,and of higher precision and more practical,which is suitable to reliability analysis of tunnel and underground structures.
Keywords:reliability improved FOSM method separation function Monte-Carlo FEM tunnel lining
本文献已被 CNKI 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号