橋梁時變可靠性的概率密度演化分析方法

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關(guān)鍵詞：概率密度演化理論；時變可靠性；在役橋梁；Dirac序列解 中圖分類號：O211.9；O213.2；U441.2文獻標(biāo)志碼：A DOI：10.16385/j.cnki.issn.1004-4523.202306037

Probability density evolution analysismethod for bridge time-dependentreliability

ZHOU Heng1，F(xiàn)AN 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

服役橋梁動態(tài)可靠性已成為橋梁工程領(lǐng)域和結(jié)構(gòu)健康監(jiān)測領(lǐng)域亟需解決的關(guān)鍵問題和研究熱點之一，可以為橋梁維修決策以及預(yù)防性維修決策提供理論基礎(chǔ)。（剩余15990字）