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CFRP约束高温后混凝土力学性能试验研究.docx

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CFRP约束高温后混凝土力学性能试验研究 Abstract ThispaperpresentsanexperimentalinvestigationonthemechanicalpropertiesofconcreteconfinedbyCarbon-fiber-reinforced-polymer(CFRP)athightemperature.ThetestingprograminvolvedcastingandtestingofseveralseriesofconcretespecimenswithdifferentlevelsofCFRPconfinementandexposedtoelevatedtemperature.Themechanicalpropertiesoftheconfinedconcreteincludingcompressivestrength,modulusofelasticityandstraincapacitywereevaluatedandcomparedwiththoseofunconfinedspecimens.TheresultsshowthatCFRPconfinementsignificantlyimprovesthemechanicalpropertiesofconcrete,particularlyathightemperature.ThegainsinmechanicalpropertiesareattributedtotheconfinementeffectofCFRPthatrestrainsthelateralexpansionandcrackingofconcreteathightemperature.TheresearchfindingsprovideusefulinsightsintotheapplicationofCFRPforimprovingconcretestructuralperformanceunderhightemperatureconditions. Keywords:Carbon-fiber-reinforced-polymer(CFRP),concrete,hightemperature,confiningeffect,mechanicalproperties. Introduction Concreteiswidelyusedinconstructionduetoitshighstrength,durabilityandlowcost.However,concreteexhibitssignificantreductioninmechanicalpropertieswhenexposedtoelevatedtemperatures.Thehightemperaturecausesthedegradationofconcretematrixandthelossofstrengthandstiffness.Thisinturnleadstoprematurefailureofconcretestructuresunderfireorhightemperatureconditions.Therefore,thereisaneedtoimprovetheperformanceofconcreteathightemperature.OneeffectivesolutionistouseexternalreinforcementintheformofCFRPconfinement. CFRPisatypeofcompositematerialcomposedofcarbonfibersandpolymermatrix.Ithashighstrength-to-weightratio,corrosionresistance,andexcellentdurability.CFRPhasbeenwidelyusedtoenhancethemechanicalpropertiesofconcretestructuresbywrappingtheconcretewithCFRPsheetsortubes.TheconfinementeffectofCFRPhasbeenshowntoeffectivelyincreasethestrength,ductility,andenergyabsorptioncapacityofconcreteundernormaltemperatureconditions. However,theperformanceofCFRP-confinedconcreteathightemperaturehasnotbeenwellstudied