ImprovingshearcapacityofexistingRCbeamsusingexternal粘钢加固钢筋混凝土梁斜截面EngineeringStructures27(2021)781–791/locate/engstructImprovingshearcapacityofexistingRCbeamsusingexternalbondingofsteelplatesSinanAltin,zgrAnil,M.EminKaraDepartmentofCivilEng.,GaziUniversity,Maltepe,06570Ankara,TurkeyReceived8October2021;receivedinrevisedform7December2021;accepted21December2021Availableonline24February2021AbstractVariousmethodsaredevelopedforstrengtheningreinforcedconcretebeamsagainstshear.Strengtheningofreinforcedconcretebeamsusingexternalboundingofsteelplateswasoneofthepopularresearchareasofrecentyears.Thisstudypresentstestresultsonstrengtheningsheardecientreinforcedconcretebeamsbyexternalbondingofsteelplates.ElevenreinforcedconcretebeamswithaT-sectionweretestedundermonotonicloadingintheexperimentalprogram.Threemaintypesofsteelmemberswithdifferentarrangementswerebondedtothesideofthebeamwebsalongtheshearspanbyusingepoxy.Thepurposewastoobtainductilebehaviorforsheardecientreinforcedconcretebeams.Thetestresultconrmedthatallsteelplatearrangementsimprovedthestrengthandstiffnessofthespecimenssignicantly.Thetensionreinforcementofallstrengthenedreinforcedconcretespecimenswasyielded.Thefailuremodesandductilityofspecimenswereprovedtodifferaccordingtothetypeofthesteelmemberandarrangementalongthebeam.Beamsthatwerestrengthenedwithcontinuoussteelplatealongtheshearspanshowedductileexuralbehavior.2021ElsevierLtd.Allrightsreserved.Keywords:Reinforcedconcretebeam;Strengthening;Shear;Epoxy;Steelplate1.IntroductionIngeneral,reinforcedconcrete(RC)beamsfailintwomodes:exureandshear.ItiswellknownthattheshearfailureofaRCbeamissuddenandbrittleinnature.Soitislesspredictableandgivesnoadvancewarningpriortofailure.Shearfailureismoredangerousthanexuralfailure.ForthatreasonRCbeamsmustbedesignedtodeveloptheirfullexuralcapacityandassureaductileexuralfailuremodeunderextremeloading.However,manyRCstructuresencountershearproblemsforvariousreasons,suchasmistakesindesigncalculations,improperdetailingoftheshearreinforcement,constructionerrorsorpoorconstructionpractices,changingthefunctionofastructurefromalowerserviceloadtoahigherserviceload,andreductionoftheCorrespondingauthor.Tel.:+903122317400/2248;fax:+903122319223.E-mailaddress:saltin@gazi.edu.tr(S.Altin).0141-0296/$-seefrontmatter2021ElsevierLtd.Allrightsreserved.doi:10.1016/j.engstruct.2021.12.012shearreinforcementsteelareaduetocorrosioninserviceenvironments.Theknownstrengtheningtechniquesofsheardecientbeamsareasfollows:CFRP,strengtheningwithexternallyappliedclamps,jacketingwithconcretelayersandexternalbondingofsteelplateswithepoxy.Forstrengtheningsheardecientbeams,althoughnumeroustestshavebeencarriedout,andshownthatcompositematerialsareanexcellentoptionforuseasexternalreinforcing,thesteelplatebondingtechniqueisbecomingpreferableforstrengtheningduetoseveraladvantagessuchaseasyconstructionwork,minimumchangeintheoverallsizeofthestructureafterplatebondingandbeinganeconomicaltechnique.ThemajorityofresearchtodateonplatebondinghavefocusedonexuralstrengtheningofRCbeamsbybondingsteelplatestobeamsofts.Previously,veryfewstudieshavebeencarriedoutontheshearstrengtheningofRCbeamsusingwebbondedsteelplates[1–8].TheultimateloadofthestrengthenedRCbeamdependsprincipallyonthecompressivestrengthoftheconcrete,theyield粘钢加固钢筋混凝土梁斜截面782S.Altinetal./EngineeringStructure...