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1、CompositeStructures47(1999)805±812www.elsevier.com/locate/compstructReinforcementofconcretebeam±columnconnectionswithhybridFRPsheeta,*aabJianchunLi,SteveLBakoss,BijanSamali,LinYeaCentreforBuiltInfrastructureResearch,FacultyofEngineering,UniversityofTechnology,Sydney,NSW2007,AustraliabCentreforAdv
2、ancedMaterialsTechnology,DepartmentofMechanicalandMachatronicEngineering,UniversityofSydney,Sydney,NSW2006,AustraliaAbstractThepaperdescribestheresultsoftestsonprototypesizereinforcedconcreteframespecimenswhichweredesignedtorepresentthecolumn±beamconnectionsinplaneframes.Thetestsweredevisedtoinve
3、stigatethein¯uenceof®brereinforcedplastic(FRP)reinforcementappliedtoexternalsurfacesadjacenttothebeam±columnconnectiononthebehaviourofthetestspecimensunderstaticloading.Ofparticularinterestunderstaticloadingwasthein¯uenceofFRPreinforcementonthestrengthandstinessofbeam±columnconnection.Asakeytothe
4、study,thehybridFRPcompositesofE-glasswovenroving(WR)andplaincarboncloth,combinedwithchoppedstrandmat(CSM),glass®bertape(GFT)withavinyl-esterresinweredesignedtoexternallyreinforcethejointoftheconcreteframe.Theresultsshowthatretro®ttingcriticalsectionsofconcreteframeswithFRPreinforcementcanprovides
5、igni®cationstrengtheningandstieningtoconcreteframesandimprovetheirbehaviourunderdierenttypesofloading.TheselectionsoftypesofFRPandthearchitectureofcompositesinordertoimprovethebondingandstrengthoftheretro-®ttingwerealsodiscussed.Ó2000ElsevierScienceLtd.Allrightsreserved.Keywords:Concretestructure
6、;Strengthening;Rehabilitation;HybridFRPcomposite;Wrappingtechnique1.Introductionconstructionmaterialwithalargerangeofmodulusandstrengthcharacteristics.Comparingwithtraditionalre-Awidelyadoptedtechniqueforretro®ttingconcretehabilitationtechniques,theFRPcompositeshavehighstructureistousesteeljacket
7、splacedaroundexistingspeci®cstrength/stiness,¯exibilityindesignandre-concretecolumns[1,2].Theuseofsteelencasementtoplacementaswellasrobustnessinunfriendlyenviron-providelateralcon®nementtotheconcreteincom-ments.WithFRP
