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GFRP型材-混凝土組合梁抗彎性能試驗(yàn)研究AbstractGFRP(GlassFiber-ReinforcedPolymer)compositematerialshavebeenwidelyusedintheconstructionindustryduetotheirexcellentmechanicalproperties.ThisstudyaimstoinvestigatetheflexuralperformanceofGFRPprofile-concretecompositebeams.AnexperimentalinvestigationwasconductedwheredifferentcombinationsofGFRPandconcretewereusedtodeterminetheirflexuralresistance.TheresultsofthestudyshowedthattheflexuralbehaviourofGFRP-concretecompositebeamsimprovedsignificantlycomparedtopureconcretebeams,confirmingtheeffectivenessofusingthesematerialsasreinforcementintheconstructionindustry.IntroductionTheuseofcompositematerialsinconstructionhasbeengrowingrapidlyinrecentyearsduetotheiroutstandingmechanicalproperties.Compositematerialsarematerialscomposedoftwoormoredistinctconstituentmaterialswithdifferentchemicalorphysicalproperties,resultinginacombinationofmaterialswithsuperiorcharacteristics.OnetypeofcompositematerialthathasgainedwidespreadacceptanceintheconstructionindustryisGlassFiberReinforcedPolymer(GFRP)compositematerial.GFRPcompositematerialsaremadeupofglassfibersembeddedinapolymermatrixandareknownfortheirremarkablemechanicalproperties,includinghighstrength-to-weightratio,tensilestrength,andstiffness.Thecompositematerial'sexcellentmechanicalperformancemakesitdesirableforuseasareinforcementinbuildingstructures,suchasbeams,columns,andslabs.Therefore,understandingthebehaviorandperformanceofGFRP-concretecompositebeamsisessentialintheconstructionindustry.ThepresentstudyaimstoinvestigatetheflexuralperformanceofGFRP-concretecompositebeams.TheresearchwillexaminetheeffectoftheGFRPreinforcementratioontheflexuralresistanceofthecompositebeams.TheresearchwillalsocomparetheperformanceofpureconcretebeamsversusGFRP-concretecompositebeams.MaterialsandMethodsSixGFRP-concretecompositebeams,withdimensionsof1000mmlength,100mmwidth,and200mmheight,wereconstructedandtestedinthisstudy.TheGFRPcompositematerialsusedinthisstudywereunidirectionalwovenrovingfabricswithathicknessof1.5mm.TheGFRPcompositematerialsusedinthebeamshadatensilestrengthof1230MPaandamodulusofelasticityof56GPa.Theconcreteusedinallthebeamswasastandard25MPastrength.Thecompositebeamsweredividedintotwogroupsbasedonthereinforcementratioused.Thefirstgroupconsistedofthreebeams,withaGFRPreinforcementratioof0.3percentoftheentirebeam'scross-sectionalarea,whilethesecondgrouphadaratioof0.6percent.Afour-pointbendingtestwasperformedtoevaluatetheflexuralperformanceofeachofthebeams.Thefour-pointbendingtestsetupconsistedoftwosupportsspacedat600mmandtwoloadingpointslocatedat200mmfromthesupports.Aloadcellwithamaximumcapacityof100kNandadataloggerwereusedtomeasuretheappliedloadandtheverticaldisplacementatthemidpointofthebeam.ResultsTheresultsofthefour-pointbendingtestsindicatedthattheflexuralstrengthoftheGFRP-concretecompositebeamsincreasedwiththeincreaseintheGFRPreinforcementratio.TheaverageultimateflexuralcapacityofthebeamswithaGFRPreinforcementratioof0.3percentand0.6percentwas5.55kNand7.83kN,respectively.ThedeflectionatthemidspanofthecompositebeamsincreasedsignificantlywiththeincreaseintheGFRPreinforcementratio.ThebeamswithaGFRPreinforcementratioof0.3percentand0.6percenthadaveragemidspandeflectionsof14.8mmand17.5mm,respectively.TheresultsofthetestsshowedthattheflexuralresponseoftheGFRP-concretecompositebeamswasdifferentfromthatofpureconcretebeams.Theload-deflectioncurvesforthecompositebeamshadagradualsofteningslope,unlikethesuddendropintheslopeobservedinconcretebeams.DiscussionTheresultsofthestudyshowedthattheinclusionofGFRPreinforcementincreasedtheflexuralresistanceoftheconcretebeamssignificantly.Theincreaseinthereinforcementratioimprovedthebeams'bendingmomentcapacityandreducedthemidspandeflection.TheseresultsareconsistentwithpreviousstudiesthatfoundGFRPreinforcementincreasedtheflexuralresistanceinconcretebeams.Thegradualsofteningslopeobservedintheload-deflectioncurvesofthecompositebeamsindicatesamoreductilebehaviourcomparedtopureconcretebeams.ThegradualsofteningslopeisbecausetheGFRPreinforcementfibersyieldprogressively.Thisbehaviourindicatesthatthecompositebeamscansustainsignificantdeformationbeforefailure,makingthemsuitableforapplicationswherethestructure'sductilityisimportant.ConclusionThepresentstudyinvestigatedtheflexuralperformanceofGFRP-concretecompositebeams.TheresultsofthestudyindicatethattheinclusionofGFRPreinforcementsignificantlyimprovedthebeams'flexuralresistancecomparedtopureconcretebeams.TheincreaseintheGFRPreinforcementratioimprovedthebeams'bendingmomentcapacityandreducedthemidspandeflection.Thegradualsofteningslopeobservedintheload-defl

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