Integrity Stable Reliability Analysis of Stochastic Structure System underMultiple Stochastic Loads
Generally,a safe margin equation is established by critical load coefficient and externalload coefficient of the system in structural integrity stable reliability analysis,and then the reliabilityindex of structural integrity stability is educed.Critical load coefficient is always obtained oncondition that structure is acted on by one load.Actually,besides one load acting on the structure,their distribution is not always the same.In addition,because of the stochastic characteristic ofstructure system itself (e.g.,cross-section of element,length,modulus of elasticity etc.are randomvariables),it is difficult for structural integrity stable reliability analysis.According to the theory ofstructure system stability and basal concept of reliability,the safe margins of structure system underdifferent distribution loads are presented in this paper.The expression of safe margin sensitivity isgiven by stochastic finite element method because the safe margin is the expression of implicitfunction.Furthermore,the reliability indexes of the safe margin under different condition are educedby the advanced first order second moment method (AFOSM).By comparison and analysis,thestructural integrity stable reliability index is ultimately obtained.
Multiple stochastic loads Critical load coefficient Safe margin Stochastic finiteelement Stable reliability
W.G.An G.P.Tian L.Zhou L.Wang
Department of Aerospace Engineering,Harbin Engineering University,Harbin 150001,China China Academy of Space Technology,Beijing 100094,China
国际会议
成都
英文
2008-08-04（万方平台首次上网日期，不代表论文的发表时间）