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1、外文原文：ResearchLettersinMaterialsScienceVolume2008(2008),ArticleID,4pagesdoi:10.1155/2008/ResearchLetterPropertiesofReinforcedConcreteSteelRebarsExposedtoHighTemperatures?lkerBekirTop?uandCenkKarakurtDepartmentofCivilEngineering,Eski?ehirOsmangaziUniversity,26480Eski?ehir,TurkeyReceived12February2008;
2、Accepted31March2008AcademicEditor:RajivS.MishraCopyright?2008?lkerBekirTop?uandCenkKarakurt.ThisisanopenaccessarticledistributedundertheCreativeCommonsAttributionLicense,whichpermitsunrestricteduse,distribution,andreproductioninanymedium,providedtheoriginalworkisproperlycited.AbstractThedeterioratio
3、nofthemechanicalpropertiesofyieldstrengthandmodulusofelasticityisconsideredastheprimaryelementaffectingtheperformanceofsteelstructuresunderfire.Inthisstudy,hot-rolledS220andS420reinforcementsteelrebarsweresubjectedtohightemperaturestoinvestigatethefireperformanceofthesematerials.Itisaimedtodetermine
4、theremainingmechanicalpropertiesofsteelrebarsafterelevatedtemperatures.Steelsweresubjectedto20,100,200,300,500,800,and950°Ctemperaturesfor3hoursandtensiletestswerecarriedout.EffectoftemperatureonmechanicalbehaviorofS220andS420weredetermined.Allmechanicalpropertieswerereducedduetothetemperatureincrea
5、seofthesteelrebars.ItisseenthatmechanicalpropertiesofS420steelwasinfluencedmorethanS220steelatelevatedtemperatures.1.IntroductionFireremainsoneoftheseriouspotentialriskstomostbuildingsandstructures.Sinceconcreteiswidelyusedinconstruction,researchonfireresistanceof25concretebecomesmoreandmoreimportan
6、t.Manyresearchersallovertheworldhavedonesomeresearchesonthissubject.Themechanicalpropertiesofallcommonbuildingmaterialsdecreasewithelevationoftemperature.Thebehaviorofareinforcedconcretestructureinfireconditionsisgovernedbythepropertiesoftheconstituentmaterials,concrete,andsteel,athightemperature.Bo
7、thconcreteandsteelundergoconsiderablechangeintheirstrength,physicalproperties,andstiffnessbytheeffectsofheating,andsomeofthesechangesarenotrecoverableaftersubsequentcooling[1].Itisnecessarytohavesafe,
