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1、正交异性钢桥面板U肋-横隔板构造细节的疲劳性能研究AbstractOrthotropicsteelbridgedeckiswidelyusedinbridgeengineeringbecauseofitshighstrength-to-weightratio,convenientconstructionandsoon.However,theinternalforcesintheorthotropicbridgedeckiscomplexundervehicleloading,coupledwithserioustrafficoverloading.Variousweldingdetail
2、sarepronetofatiguecracking.Thestructuralbehaviorisstudiedunderliveload,thecrackingmechanismofstructuredetailsareanalyzedandreasonablestructuredetailsoforthotropicsteelbridgedeckareprovided,whichareveryimportantforsafeserviceanddurabilityofbridges.Startingfromtheassessmentmethodandexperimentsanaly
3、sis,thepaperdiscussesrib-to-diaphragmconnectiondetailsonorthotropicsteelbridgedeckonarealbridge.Themainresearchcontentsandachievementsareintroducedasfollows:(1)Thecurrentsituationsandfatigueproblemoforthotropicsteelbridgedeckareintroduced.Then,themethodoffatiguestudiesisreviewedandthemainworkofth
4、ethesisisoutlined.(2)Theprinciples,theusingcondition,thecalculationmethodandthecorrespondingspecificationsofnominalstressmethod,hotspotstressmethod,zerostructuralstressmethod,notchstrainmethodandlinearelasticfracturemechanicsareintroduced,respectively.Inaddition,itanalyzestheadvantagesanddisadvan
5、tagesofthesemethods.(3)Theeffectivenotchstressmethodisemployedforfatigueassessment,andelementtype,meshsizeandweldrootareaformeshingwayareanalyzedinfilletweldedcruciformjoint.Theresultsshowthatthecalculationofeffectivenotchstressshouldusehighorderelementinconsiderationoflockphenomenon.Themeshsizem
6、ustsatisfytheIIWregulations,andexcessivemeshisnotsuggestedbecauseofanincreasedCPUtime.Whentheloadisappliedparalleltothenotch,key-holeandU-holearesuitabletobeused,whentheloadisverticaltothenotch,key-holeispreferable.(4)Inordertoverifythepresentmethod,thefatiguestressiscalculatedbyhotspotstressmeth
7、odandeffectivenotchstressmethod,respectively.Theresultshowsthateffectivenotchstressmethodisasuitablemethodforassessingfatigueperformanceoforthotropicsteelbridgedeck,anditismoreappropriatethanhotspotstressmethod.Theeffe
