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1、PAPERDevelopmentofCompositeSteelGirderandConcreteSlabMethodforRenovationofExistingSteelRailwayBridgesIchiroSUGIMOTO,Ph.D.YoshinoriYOSHIDAAkiraTANIKAGALaboratoryHead,Researcher,Researcher,SteelHybridStructuresLaboratory,StructureTechnologyDivisionOverhalftheexistingsteelrailwaybridgesinJa
2、panhavebeeninserviceformorethanseventyyears.Someofthesebridgeshavesevereproblemsincludingcorrosionoftheupperflange,fatigueandnoiseemissions.Inthisstudy,amethodisproposedforthestructuralimprovementofexistingrailwaysteelbridgesthroughinstallingconcreteslabsonexistingsteelgirders.Thismethod
3、improvestheload-bearingcapacityofthebridges,extendstheirserviceablelife,andreducesnoiseemissions.Feasibilitystudiesforeaseofapplicationofthecompositegirdersweremadeandtheproposedmethodwasverifiedtoensureitcouldbecom-pletedwithinthetightallocatedtimeschedules.Furthermorewefoundthroughload
4、ingteststhattheproposedmethodtoproducecompositegirdersalsostrengthenedandincreasedthestiffnessofthegirders.Keywords:steelrailwaybridge,maintenance,renewal,compositegirder1.IntroductionSleeperConcreteslabOverhalfthesteelrailwaybridgesinJapanhavebeeninserviceformorethanseventyyears[1].Thew
5、oodensleepersonsteelrailwaybridgesbuiltinthepastweredi-rectlysetonthegirders.Inthistypeofbridge,theupperflangeofgirderssupportingtheundersurfaceofsleepersarevulnerabletocorrosion,whichinturnweakenstheloadbearingcapacityofthestructure[2,3].Althoughmanyoftheexistingsteelrailwaybridgesarecu
6、rrentlystillinuse,thenumberneedingtobereplacedwillgraduallyin-Steelgirdercrease.Replacingabridgenotonlyinvolvesredesigning(a)Steelgirder(b)Compositegirderandrebuildingthebridgebutalsomeansreplacingtrackandsecuringlandforthereconstruction,etc.Asaresult,Fig.1Outlineofthecompositegirderther
7、econstructionofmanysuchbridgesinshortperiodbe-comescostlyanditisthereforebecomingincreasingurgent2.Outlineofthecompositegirderforoldsteelrail-tofindwaystoextendthelifeofsteelbridges,whichgobe-waybridgesyondjustordinaryrepairsandmaintenance.Manystud-iesintorepairsandmainte
