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1、外文原文：ResearchLettersinMaterialsScienceVolume2008(2008),ArticleID814137,4pagesdoi:10.1155/2008/814137ResearchLetterPropertiesofReinforcedConcreteSteelRebarsExposedtoHighTemperatures?lkerBekirTop?uandCenkKarakurtDepartmentofCivilEngineering,Eski?ehirOsmangaziUni
2、versity,26480Eski?ehir,TurkeyReceived12February2008;Accepted31March2008AcademicEditor:RajivS.MishraCopyright?2008?lkerBekirTop?uandCenkKarakurt.ThisisanopenaccessarticledistributedundertheCreativeCommonsAttributionLicense,whichpermitsunrestricteduse,distributi
3、on,andreproductioninanymedium,providedtheoriginalworkisproperlycited.AbstractThedeteriorationofthemechanicalpropertiesofyieldstrengthandmodulusofelasticityisconsideredastheprimaryelementaffectingtheperformanceofsteelstructuresunderfire.Inthisstudy,hot-rolledS2
4、20andS420reinforcementsteelrebarsweresubjectedtohightemperaturestoinvestigatethefireperformanceofthesematerials.Itisaimedtodeterminetheremainingmechanicalpropertiesofsteelrebarsafterelevatedtemperatures.Steelsweresubjectedto20,100,200,300,500,800,and950°Ctempe
5、raturesfor3hoursandtensiletestswerecarriedout.EffectoftemperatureonmechanicalbehaviorofS220andS420weredetermined.Allmechanicalpropertieswerereducedduetothetemperatureincreaseofthesteelrebars.ItisseenthatmechanicalpropertiesofS420steelwasinfluencedmorethanS220s
6、teelatelevatedtemperatures.1.IntroductionFireremainsoneoftheseriouspotentialriskstomostbuildingsandstructures.Sinceconcreteiswidelyusedinconstruction,researchonfireresistanceof25concretebecomesmoreandmoreimportant.Manyresearchersallovertheworldhavedonesomerese
7、archesonthissubject.Themechanicalpropertiesofallcommonbuildingmaterialsdecreasewithelevationoftemperature.Thebehaviorofareinforcedconcretestructureinfireconditionsisgovernedbythepropertiesoftheconstituentmaterials,concrete,andsteel,athightemperature.Bothconcre
8、teandsteelundergoconsiderablechangeintheirstrength,physicalproperties,andstiffnessbytheeffectsofheating,andsomeofthesechangesarenotrecoverableaftersubsequentcooling[1].Itisnecessar
