ExperimentalstudyofFRP

Inthisstudy,twotypesoffiberreinforcedpolymer(FRP)confinedconcretecylinderswereprepared.OnewasFRPjacketedconcretecylinders;theotherwasFRPtubeencasedconcretecylinders.Atotalof24jacketedcylindersand15encasedcylinderswereprepared.Forthejacketedcylinders,sixfiberorientationsandtwoFRPwallthicknesseswereused;fortheencasedcylinders,fourbatchesofconcretewithnormaltohighstrengthwereusedandbothbondedandunbondedinterfacialconditionswereconsidered.Itisfoundthatinsufficientlyconfinedcylindersbehavesimilartounconfinedcylinders.FRPcannotconfinetheconcretecoreuntiltheconcreteisdamaged(crackedorcrushed)duetothelargertransversePoisson'sratioandloweraxialstiffnessofFRP.Therateofincreaseinconfinementeffectivenessdecreasesnonlinearlyasconfinementratioincreases.Aconsiderabledeviationisfoundbetweenthepredictionbyexistingdesign-orientedconfinementmodelsandtestresults.

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ExperimentalstudyofFRP-图一

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