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Newprogressinstudyofthetechnologyofstrengthening

structureswithprestressedfiberreinforcedplastics

LuYiyan,ChenJuan,HuangYinshen,WuTao

(SchoolofCivilEngineering,WuhanUniversity,Wuhan430072,China)

[Abstract]??Theapplicationoffiberreinforcedplastics(FRP)instrengtheningprojectsisoneofthemostpopularfieldsinthestudiesincivilengineering.Practicesandtheorieshavetestifiedthatthetechnologyof

strengtheningstructureswithprestressedFRPisfeasiblewithobviousadvantages.Aconcisestate-o-fthe-artsurveyandnewprogressofthetechnologyofstrengtheningstructureswithprestressedFRParepresented,includingstudiesintermsofconcretestructuresstrengtheningwithprestressedFRP,steelstructuresstrengtheningwithprestressedFRPandthekeyproblemsinitspracticalapplication.Experimentalstudiesrevealedthatstrengthenedwithpres-tressedFRP,thecrackingload,yieldingloadandultimatecapacityofRCbeamsincreasedobviously,behaviorsofflexuremembersunderlong-termloadwereimproved,andthefatiguelifeofconcretememberswerealsoincreased.StrengthensteelbeamswithprestressedFRP,theyieldingloadandultimatecapacityincreasedobviously,withgreaterincreasewhenmoreCFRPwereusedorathigherprestressleve.lPrestressedCFRPcontributedtotherigid-ityofsteelbeamespeciallywhenstrengthofsteelisrelativelylow.ThekeyproblemsinpracticalapplicationofthetechnologyofstrengtheningwithprestressedFRPincludethestudiesonprestressapplyingsystem,prestresscontrolvalue,prestresslossandendanchoragesystem.

[Keywords]??fiberreinforcedplastics;strengtheningtechnology;concretestructures;steelstructures;researchprogress

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