桥梁时变可靠性的概率密度演化分析方法

打开文本图片集

关键词：概率密度演化理论；时变可靠性；在役桥梁；Dirac序列解 中图分类号：O211.9；O213.2；U441.2文献标志码：A DOI：10.16385/j.cnki.issn.1004-4523.202306037

Probability density evolution analysismethod for bridge time-dependentreliability

ZHOU Heng1，FAN Xueping1，²，LIU Yuefei1，²2 （1.SchoolofCivilEngineeringandMchanics，LanzhouUniversityLanzhou730oo，China;2.KeyLaboratoryofechanicson DisasterandEnvironmentinWesternChina，heMinistryofEducation，Lanzhou University，Lanzhou73Ooo，China）

Abstract：Existingbridgesundergotime-varyingloadefectsandresistancedegradationduringservice.Thecomplexloadsanddi versefailuremodesmaketheexistingbridgesfacegreaterrisks inservice.Therefore，itisurgenttomaketime-dependentreliability assessmentfortheservicebridges.Theclassicaltime-varyingreliabilityanalysismethodismorecomplexanddificultasthenumberofrandomvariablesincreases.Inthispaper，probablitydensityevolution theoryis introducedtosolvetheaboveproblem， which is more advantageous forsolvingthereliabilityofcomplexstructures withmultiplerandomvariables.Thedynamicreliability oftheexistingbridgeinserviceabilityimitstateandultimatelimitstateisanalyzedbyconsideringthebridgeresistancedegadation andloadeffectincrease，aswellasthetimevaryingfactorssuchasshrinkageandcrepefectofconcretebridges.Theaccuracy andcomputationaleficiencyforthismethodarecomparedwiththeMonteCarlomethod，andtheeffectivenessoftheproposed method is verified.

Keywords：probabilitydensityevolutionmethod;time-dependentreliability;bridges inservice;Diracsequencesolution

服役桥梁动态可靠性已成为桥梁工程领域和结构健康监测领域亟需解决的关键问题和研究热点之一，可以为桥梁维修决策以及预防性维修决策提供理论基础。（剩余15990字）