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1、CriticalReviewofDeflectionFormulasforFRP-RCMembersCarlosMota1;SandeeAlminar2;andDagmarSvecova31ResearchAssistant,Dept.ofCivilEngineering,Univ.ofManitoba,WinnipegMB,CanadaR3T5V6.2ResearchAssistant,Dept.ofCivilEngineering,Univ.ofManitoba,WinnipegMB,CanadaR3T5V6.3AssociateProfessor,Dept.
2、ofCivilEngineering,Univ.ofManitoba,WinnipegMB,CanadaR3T5V6（correspondingauthor）.Abstract:Thedesignoffiber-reinforcedpolymerreinforcedconcreteFRP-RCistypicallygovernedbyserviceabilitylimitstaterequirementsratherthanultimatelimitstaterequirementsasconventionalreinforcedconcreteis.Thu
3、s,amethodisneededthatcanpredicttheexpectedserviceloaddeflectionsoffiber-reinforcedpolymerFRPreinforcedmemberswithareasonablyhighdegreeofaccuracy.Ninemethodsofdeflectioncalculation,includingmethodsusedinACI440.1R-03,andaproposednewformulainthenextissueofthisdesignguide,CSAS806-02andI
4、SISM03-01,arecomparedtotheexperimentaldeflectionof197beamsandslabstestedbyotherinvestigators.ThesemembersarereinforcedwitharamidFRP,glassFRP,orcarbonFRPbars,havedifferentreinforcementratios,geometricandmaterialproperties.Allmembersweretestedundermonotonicallyappliedloadinfourpointbend
5、ingconfiguration.TheobjectiveoftheanalysisinthispaperistodetermineamethodofdeflectioncalculationforFRPRCmembers,whichisthemostsuitableforserviceabilitycriteria.TheanalysisrevealedthatboththemodulusofelasticityofFRPandtherelativereinforcementratioplayanimportantroleintheaccuracyofthefo
6、rmulas.CEDatabasesubjectheadings:Concrete,reinforced;Fiber-reinforcedpolymers;Deflection;Curvature;Codes;Serviceability;Statistics.IntroductionFiber-reinforcedpolymerFRPreinforcingbarsarecurrentlyavailableasasubstituteforsteelreinforcementinconcretestructuresthatmaybevulnerabletoatt
7、ackbyaggressivecorrosiveagents.Inadditiontosuperiordurability,FRPreinforcingbarshaveamuchhigherstrengththanconventionalmildsteel.However,themodulusofelasticityofFRPistypicallymuchlowerthanthatofsteel.ThisleadstoasubstantialdecreaseinthestiffnessofFRPreinforcedbeamsaftercracking.Sinced
8、eflec
