基于非概率理论模型的在役rc桥梁可靠性分析-reliability analysis of in-service rc bridge based on non-probability theory model.docx

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2018-06-05 发布于上海
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基于非概率理论模型的在役rc桥梁可靠性分析-reliability analysis of in-service rc bridge based on non-probability theory model.docx

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基于非概率理论模型的在役rc桥梁可靠性分析-reliability analysis of in-service rc bridge based on non-probability theory model

one-dimensionaloptimizationalgorithmmainlyaimsatsolvingnon-probabilisticreliabilityindexwithexplicitlimitstateequation;however,ifanalyticalexpressionisnotavailable,then,itisunabletohavesolution.Therefore,thisdissertationexploresnon-probabilisticresponsesurfaceanalysis(RSA)basedonfiniteelement;themethodcaneffectivelysolvenon-probabilisticreliabilityindexwithundefinedstructureinlimitstateequation.ThedissertationalsoproposesFailurePointOptimizationMethodbasedonfiniteelement,whichisofnoneedsforlargenumbersofFEM(FiniteElementMethod)anditerations.Themethodcanwildlybeappliedinstructuralevaluationofnon-probabilisticreliability.Bridgeisacomplexstructurewithrelativelylargevariables.Ifwewanttofindsolutionofnon-probabilisticreliabilityindexwithconsiderationofeachvariableasintervalvariable,theworkloadwillbeverylargeandsometimesitevencouldnotbecalculated.Simultaneously,largehumanandfinancialresourceswouldbeconsumedifeachvariableofbridgeweretobemeasured.Therefore,itprovidesevidenceforvariablesofnon-probabilisticreliabilityevaluationandguidancetoon-sitemeasurement.Atonetime,byjudgingmonotonicityofeachparameterandprovidingsupportsforalgorithmofnon-probabilisticreliabilityindexbasedonfiniteelement,thedissertationmakessensitivityanalysisforparameters.Introducingnon-probabilisticreliabilitytheoryintoexistingbridge,establishingnon-probabilisticreliabilityevaluationsforlimitstateofcarryingcapacityandnormalconditionofexistingbridge,andapplytheminrealbridges.Byconsideringtimevaryingofconcretecarbonation,concretestrength,steelcorrosion,corrodedsteelstrengthandloadsofcarsandcrowdssynthetically,thedissertationestablishesdynamicnon-probabilisticreliabilitymodelbasedoncarryingcapacitylimitstateandpredictsitslife.Simultaneously,basedoncontrolstocrackwidthanddeflectionofnormallimitstate,itproposestheconceptofstagelifeprediction.Finally,thedissertationmakespredictiontooverallandstagelifeofrealbridgerespectively.Bymakingresearchestoanti-optimizationdesignofexistingbridge,itestablishestwotypesofanti