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基于剪力–柔性梁格法的大箱梁加宽旧T形梁桥荷载横向分布研究.docx

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基于剪力–柔性梁格法的大箱梁加宽旧T形梁桥荷载横向分布研究 Title:InvestigationonLateralLoadDistributionofWidenedBoxGirderBridgewithOldT-beamusingShear-FlexibleBeamGridMethod Abstract: ThispaperaimstoinvestigatethelateralloaddistributionofawidenedboxgirderbridgewithanoldT-beamusingtheshear-flexiblebeamgridmethod.Thelateralloaddistributionisacriticalaspecttoconsiderindesigningbridgestructures,asitaffectsthestructuralintegrityandsafetyofbridgedecks.Inthisstudy,theshear-flexiblebeamgridmethodisemployedtomodelthebridgedeck,takingintoaccounttheflexibilityanddeformationduetolateralloads.Theresultsobtainedthroughnumericalanalysisprovideinsightsintotheloaddistributioncharacteristics,whichwouldfacilitatetheoptimizationofbridgedesigns. 1.Introduction Bridgesplayasignificantroleintransportationinfrastructure,allowingthesmoothflowofgoodsandpeople.Theconditionofexistingbridgesoftenrequiresrehabilitationorwideningtoaccommodateincreasingtrafficdemands.However,wideninganoldT-beambridgepresentschallengesintermsofloaddistribution,whichmustbecarefullyexaminedtoensurethestructuralintegrityandsafetyofthemodifiedbridge.Thelateralloaddistributionisparticularlycriticalasitaffectsthedistributionofloadsamongthestructuralmembers. 2.LiteratureReview Previousstudieshaveaddressedthelateralloaddistributionofwidenedbridges,primarilyfocusingonthetraditionalbeammethodorfiniteelementmethod.However,thesemethodsarelimitedineitherneglectingtheinfluenceofflexibilityorimposinghighcomputationalrequirements.Toovercometheselimitations,theshear-flexiblebeamgridmethod,whichcapturestheflexibilityofbridgedeckswhilemaintainingcomputationalefficiency,isintroducedinthisstudy. 3.Methodology Theshear-flexiblebeamgridmethodisbasedontheconceptofdividingthedeckintoagridofsmallerbeamelementsconnectedbyhinges.Eachbeamelementisindependentlyanalyzedforitslateralloadresponse,consideringtheflexibilityofadjacentelements.Byintegratingtheresponsesofallbeamelements,thecompleteloaddistributionpatterncanbeobtained. 4.CaseStudy Tovalidatetheproposedmethod,acases