摘要
在研究矩独立基本变量对响应分布影响的重要性测度的基础上,定义了基本变量对失效概率的重要性测度.基本变量对失效概率的重要性测度可以直接全面地给出基本变量对结构安全影响的重要程度,因而该重要性测度将更具有工程指导作用.文中分析了所定义基本变量对失效概率影响重要性测度的基本性质,并基于鞍点线抽样在求解可靠度时不受随机变量分布形式的限制及其效率和精度较高的优点,提出了求解该重要性测度的鞍点线抽样方法.
From the moment-independent importance measure of basic variable effect on response distribution, an importance measure is defined to describe the effect of basic variable on failure probability.Compared with the importance measure of the basic variable effect on the response distribution,this measure can directly provide the global effect of the variables on the structural safety,so can provide more guidance in engineering design than the former.The basic properties of the importance measure of the basic variable effect on the failure probability are discussed in this paper.Since the saddlepoint based line sampling method is independent of the distribution types of the random variables,and has the advantages of high accuracy and efficiency,this method is employed to estimate the defined importance measure.
出处
《力学与实践》
CSCD
北大核心
2010年第2期71-75,共5页
Mechanics in Engineering
基金
国家自然科学基金(10572117
50875213)
新世纪优秀人才支持计划(NCET-05-0868)
航空基础基金(2007ZA53012)
863计划课题(2007AA04Z401)
科技重大专项(2009ZX04014-015-03)资助项目
关键词
鞍点逼近
线抽样
矩独立
重要性测度
失效概率
saddlepoint approximation
line sampling
moment independent
importance measure
failure probability
作者简介
李贵杰,1983年生,男,硕士研究生,主要从事可靠性工程方面的研究.E-mail:Igjnwpu@mail.nwpu.edu.cn.
吕震宙,1966年生,女,教授,博士生导师,主要从事可靠性工程、飞行器结构设计方面的研究.E-mail:zhenzhoulu@nwpu.edu.cn