资源描述:
《混凝土高温后静动态力学性能研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
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目录第一章绪
8、论.......................................