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1、外文原文：ResearchLettersinMaterialsScienceVolume2008(2008),ArticleID814137,4pagesdoi:10.1155/2008/814137ResearchLetterPropertiesofReinforcedConcreteSteelRebarsExposedtoHighTemperaturesİlkerBekirTopçuandCenkKarakurtDepartmentofCivilEngineering,EskişehirOsmangaziUniversity,26480Eskişehir,TurkeyReceived12F
2、ebruary2008;Accepted31March2008AcademicEditor:RajivS.MishraCopyright©2008İlkerBekirTopçuandCenkKarakurt.ThisisanopenaccessarticledistributedundertheCreativeCommonsAttributionLicense,whichpermitsunrestricteduse,distribution,andreproductioninanymedium,providedtheoriginalworkisproperlycited.AbstractThe
3、deteriorationofthemechanicalpropertiesofyieldstrengthandmodulusofelasticityisconsideredastheprimaryelementaffectingtheperformanceof29steelstructuresunderfire.Inthisstudy,hot-rolledS220andS420reinforcementsteelrebarsweresubjectedtohightemperaturestoinvestigatethefireperformanceofthesematerials.Itisai
4、medtodeterminetheremainingmechanicalpropertiesofsteelrebarsafterelevatedtemperatures.Steelsweresubjectedto20,100,200,300,500,800,and950∘Ctemperaturesfor3hoursandtensiletestswerecarriedout.EffectoftemperatureonmechanicalbehaviorofS220andS420weredetermined.Allmechanicalpropertieswerereducedduetothetem
5、peratureincreaseofthesteelrebars.ItisseenthatmechanicalpropertiesofS420steelwasinfluencedmorethanS220steelatelevatedtemperatures.1.IntroductionFireremainsoneoftheseriouspotentialriskstomostbuildingsandstructures.Sinceconcreteiswidelyusedinconstruction,researchonfireresistanceofconcretebecomesmoreand
6、moreimportant.Manyresearchersallovertheworldhavedonesomeresearchesonthissubject.Themechanicalpropertiesofallcommonbuildingmaterialsdecreasewithelevationoftemperature.Thebehaviorofareinforcedconcretestructureinfireconditionsisgovernedbythepropertiesoftheconstituentmaterials,concrete,andsteel,athighte
7、mperature.Bothconcreteandsteelundergoconsiderablechangeintheirstrength,physicalproperties,andstiffnessbytheeffectsofheating,andsomeofthesechangesarenotrecoverableaftersubsequentcooling[1].29Itisnecess
