U肋加勁鋼橋面板焊接殘余應力與變形研究_第1頁
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U肋加勁鋼橋面板焊接殘余應力與變形研究AbstractInrecentyears,U-ribbedsteelbridgedeckpanelswithgreaterstiffnessandbetterdurabilityhavebecomepopularinbridgeengineering.However,residualstressanddeformationafterweldingoftheU-ribbedsteelbridgedeckpanelscanhaveasignificantimpactontheperformanceofthebridge.ThisstudyaimedtoinvestigatetheresidualstressanddeformationofU-ribbedsteelbridgedeckpanelsafterweldingandprovidesuggestionsfortheiroptimization.AfiniteelementmodelwasestablishedtosimulatetheweldingprocessandcalculatetheresidualstressanddeformationoftheU-ribbedsteelbridgedeckpanels.ThesimulationresultsshowedthattheresidualstressanddeformationintheU-ribbedsteelbridgedeckpanelsweremainlyconcentratedneartheweldingzones.Finally,suggestionsforoptimizingtheweldingprocesswerepresented.Keywords:U-ribbedsteelbridgedeckpanel,welding,residualstress,deformationIntroductionBridgeengineeringplaysacriticalroleinmoderntransportation.Bridgedeckpanelsareanessentialcomponentofmodernbridges,whichincludevariousmaterialsandforms.U-ribbedsteelbridgedeckpanels,duetotheirbetterstiffness,durability,andservicelife,havebecomeoneofthepopularchoices.However,weldingoftheU-ribbedsteelbridgedeckpanelstypicallyleavesresidualstressesanddeformations,whichmaysignificantlyaffecttheirperformancebycausingcracking,distortion,andfatiguecracksinthestructure.ThisstudyaimedtoinvestigatetheresidualstressanddeformationafterweldingoftheU-ribbedsteelbridgedeckpanelsandprovidesuggestionsfortheiroptimization.MaterialsandMethodsTheU-ribbedsteelbridgedeckpanel'sdimensionsusedinthisstudywere6,250mminlength,2,300mminwidth,and120mminthickness.Thepanelconsistsofasteelplate,twoU-ribs,andacoverplate.ThematerialusedwasQ345Bsteel.Athree-dimensionalfiniteelementmodelwasestablishedusingABAQUS/CAEsoftwaretosimulatetheweldingprocessandcalculatetheresidualstressanddeformationoftheweldedU-ribbedsteelbridgedeckpanel.Theweldingprocesswassimulatedusingthethermal-structuralcouplingmethod.Theweldingprocessincludedapreheatingstage,aweldingstage,andacoolingstage.Thetemperature-dependentmaterialpropertiesofQ345Bsteelwereconsideredduringthesimulation.Duringthesimulation,theboundaryconditionsofthemodelwerefixedinalldirections.ResultsThesimulationresultsshowedthattheresidualstressanddeformationintheU-ribbedsteelbridgedeckpanelsweremainlyconcentratedneartheweldingzones.Themaximumresidualstresswas190MPa,locatedattheweldsinthemiddleoftheU-ribs.Themaximumdeformationwas2.6mm,whichoccurredatthecenterofthecoverplate.Thedistributionofdeformationwasgenerallysymmetricalattheleftandrightendsofthepanel,whichindicatestheeffectofweldingontheoveralldeformationofthepanel.DiscussionTheresidualstressanddeformationcausedbyweldingcanaffectthestability,deformation,andcrackingofU-ribbedsteelbridgedeckpanels.Factorssuchastheweldingparameters,thethicknessoftheU-rib,andthewidthoftheplatearesignificantfactorsthataffectresidualstressanddeformation.Therefore,optimizingtheseparameterscanlessentheeffectofweldingontheU-ribbedsteelbridgedeckpanel'sperformance.Severalsuggestionsforoptimizingtheweldingprocesswereproposedbasedonthesimulationresults,whichinclude:1.UsingasmallerU-ribsectionorawiderplatecanreducetheresidualstressanddeformationatthewelds.2.Usingsmallweldingbeadsizesandappropriateweldingheatinputscanminimizetheresidualstressanddeformationformedduringwelding.3.TheweldingsequenceshouldbealignedwiththeU-ribsection'sheighttomitigatetheeffectofweldingontheoveralldeformationofthepanel.ConclusionThisstudyinvestigatedtheresidualstressanddeformationofU-ribbedsteelbridgedeckpanelsafterweldingandprovidedsuggestionsfortheiroptimization.Thesimulationresultsshowedthatresidualstressanddeformationmainlyoccurredneartheweldingzones,andfactorssuchasU-ribsection,platewidth,

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