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1、AnchorageDevicesUsedtoImprovethePerformanceofReinforcedConcreteBeamsRetrofittedwithFRPComposites:State-of-the-ArtReviewR.Kalfat1;R.Al-Mahaidi,M.ASCE2;andScottT.Smith,M.ASCE3Abstract.Theanchorageoffiber-reinforcedpolymer(FRP)compositeswhenappliedtoreinforcedconcret
2、e(RC)structuresasexternallybondedreinforcementisaneffectivemeanstoachievehigherlevelsoffiberutilizationpriortoprematuredebondingfailure.CommonlydocumentedanchoragemethodsforFRP-to-concreteapplicationsdemonstratingencouragingresultsincludeFRPU-jackets,FRPanchors(al
3、soknownasspikeanchors,amongothernames),patchanchors(utilizingunidirectionalandbidirectionalfabrics),nailedmetalplates(alsoknownashybridbonding),near-surfacemountedrods,mechanicalfastening,concreteembedment,andmechanicalsubstratestrengthening.AnchoragesappliedtoFRP
4、systemshavebeenverifiedthroughexperimentaltestingandnumericalmodelingtoincreasetheductility,deformability,andstrengthofthememberandalsoprevent,delay,orshiftthecriticalmodeofFRPdebondingfailure.Althoughthebenefitsofanchoragesolutionshavenowbeenwidelyacknowledgedbyr
5、esearchers,furtherstudiesarerequiredinordertoestablishreliabledesignformulationstonegatetherequirementforongoinglaboratoryverificationbyindustry.Thepresentpaperisastate-of-the-artreviewofexperimentalstudiesconductedintheareaofFRPanchoragesystemsappliedtoFRP-streng
6、thenedRCflexuralmembers.Availableexperimentaldataarecompiledandcataloguedandananchorageefficiencyfactorforeachanchoragetypeunderinvestigationisassignedinordertoquantifytheanchor’sefficiency.Finally,currentshortcomingsinknowledgeareidentified,inadditiontoareasneedi
7、ngfurtherinvestigation.DOI:10.1061/(ASCE)CC.1943-5614.0000276.©2013AmericanSocietyofCivilEngineers.CEDatabasesubjectheadings:Fiberreinforcedpolymer;Anchors;Fastening;Concretebeams;Rehabilitation;Compositematerials;State-of-the-artreviews.Authorkeywords:Fiber-reinf
8、orcedpolymer(FRP);U-jackets;Anchor;Spike;Mechanicalfastening;Bidirectionalfabric;Substratestrengthening.IntroductionHowever,FRPsolutionsarenotwithoutthe
