火灾中不同材料对钢筋溷凝土构件受力性能的影响

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1、维普资讯http://www.cqvip.com第l0卷3期应用基础与工程科学学报Vo1．10，No．3JOURNALOFBASICSCIENCEANDENGINEERINGSeptember20022002年9月文章编号：1005-0930(2002)-03-0277—10中图分类号：TU375文献标识码：AConcreteMembersUnderFireZHOUXingang，ZHANGJohn(1．DepartmentofCivilEngineering，YantaiUniversity，Yantai2

2、64005；2．SchoolofConstruction＆BuildingSciences．UniversityofWesternSydney，NSW2753)Abstract：Fromthepointofviewoftheirperformanceinfire，forsteel，themechanicalpropertiesrelatedtobehaviorintensionatelevatedtemperatureareofprincipleinterest；forconcrete，themechanic

3、alpropertiesandthermalpropertiesareofequalinterest；fornon—burnablecoatings，onlythethermalpropertiesareofinterest；andforburnablecoatings，itisseverityoffire．Non—burnablecoatingscallpreventfireheattopenetratetotheirinnerstructuralmembers，thusthefiresafetyofcon

4、cretestructurescanbeimprovedbythiskindofcoatings．Ontheotherhandburnablecoatingscanproduceadditionalheatduringfire．Asaresult，moredamagewouldbeinducedtoconcretestructureswithburnabledecorativematerialsiffirewereencountered．TheEuro—Codeindoortemperature—timere

5、lationshipunderfirecondition，constitutiverelationshipofconcreteandsteelatelevatedtemperatureandconcretenonlinearanalysisapproachareemployed，andthedistributionoftemperaturewithinthesectionofconcretemembersandtheloadcarryingcapacityareinvestigated．Basedonthea

6、nalysisresults，factorsrelatedtothefiresafetyofconcretestructuresexposuretofirehavebeendiscussed．Keywords：fireloads，temperature，constitutiverelationship，coatings，loadcarryingcapacityUnderfireconditions．theindoortemperatureiSafunctionofindoorfireloads，floorar

7、ea，ventilation．thermalconductionbehaviorofwalls，etc．Sounderactualfeldfire，thetemperature—timerelationshipisgreatlyaffectedbythefuelavailable，andbythegeometryofthefireafectedcompartmentandtheavailableventilationaswell，andclearlydepartgreatlyfromtheStandardCu

8、rve．Astheavailablefuelbecomesexhaustedandfinalcoolingphaseofthefirereaches．thetemperaturedecreasessharplyandrealcurvesfallawayfromtheIS0834curveasshowninFigure1J．2j．Thereforearealistictemperature—timer