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1、AbstractAsaengineeringmaterial,concreteiswidelyusedontheconstructionworkswhoarepossibletoexposetothehightemperatureandimpactload.Ifyoudon’tknowthemechanicalpropertyofconcreteinsuchconditions,youcan’tmakethestructuraldesignsafely.Soitisnecessarytostudythemechanicalpropertiesofconc
2、retewithcomplexconditions.Inthispaper,theresearchisbasedonakindofordinaryconcretewhichthestrengthgradeisC35,andtherearetwowaystodothestudyincludingmakingmechanicaltestsandestablishingtheconstitutivemodel.Forthetests,puttingtheconcretespecimensunderhightemperatureandcoolingdownbyw
3、homodes.Thendiscussingthemechanicallawofcompressivestrength,elasticmodulusandtensilestrengthunderstaticforce,andmechanicallawofcompressivestrengthunderdynamicforce.Fortheconstitutivemodel,basedonthenon-linearelasticconstitutiveequation,consideringthedamagefactorandthestrainrate,e
4、stablishingaproperconstitutiveequation.Thedetailsandmainconclusionsareasfollows:Themechanicsperformanceofconcreteisrelatedtothetemperatureandcoolingmode.Withthetemperatureincreasing,theelasticmodulusandcompressiveunderstaticforcedecreasing,butthestraincorrespondingwiththepeekstre
5、ssincreasing.Comparedwiththenaturalcoolingspecimens,themechanicalpropertiesofwatercoolingspecimensarehigherwhenthetemperatureisbelow300degree,abovethistemperature,thepropertieswillbeweakened.Similarly,thetensilestrengthisdecreasingasthetemperatureincreases.Inthedynamictest,theSHP
6、Bmethodisused.Theresultsshowsthat,thestrainratesignificantlyenhancethecompressivestrength,butwhenthetemperatureishighenough,theenhancementbecomeslighter.Whileconsideringallthethreefactors,thereisnoobviouschangingrulesinthestraincorrespondingwiththepeekstress.Thenon-linearelasticc
7、onstitutiveequationestablishedinthispaperiscomparedwiththetestresults,itisprovedthat,thetheoreticalarithmeticstress-straincurveisgreatlyconsistwiththeexperimentcurve.Keywords:Concrete,AfterhighTemperature,Coolingmode,Staticanddynamicmechanicalproperties,Constitutivemodeliii目錄第一章緒
8、論.......................................
