Fire Design Note 3-Concrete-filled Steel Columns-2002.pdf

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1、No.3,September2002CONCRETE-FILLEDSTEELCOLUMNSPREDICTIONOFFIRERESISTANCEbyI.D.BennettsandC.C.GohCentreforEnvironmentalSafetyandRiskEngineeringVictoriaUniversityofTechnologyIntroductionItcanbeseenthatthepresenceofconcretefillinggreatlyincreasesthefire-resistanceofanexternall

2、yprotectedThefireresistanceofstructuralsteelhollowsection(SSHS)memberoverthatassociatedwithanidenticalmemberthatcolumnscanbeenhancedthrough:isnotconcrete-filled.Thereductioninsteeltemperaturedue(a)encasingthesectionwithinafire-protectivecoatingtoconcretefillingisonlyappare

3、ntforexternallyprotected(b)fillingwithunreinforcedconcretemembers1.(c)fillingwithfibre-reinforcedconcrete(d)fillingwithconventionalreinforcedconcreteIfhollowsectionsarespecifiedforarchitecturalreasons,itisunlikelythatprotectionoftheoutsideofthetubewillbeanInthecaseof(a)the

4、thicknessoffireprotectioncanbeacceptablemeansofachievingtherequiredfire-resistancedeterminedasforanysteelsectionandreferenceismadetolevel2.ItfollowsthatenhancingthefireresistanceofatheHandbookofFireProtectionMaterialsforStructuralsectionthroughconcrete-fillingpresentsitsel

5、fasanattractiveSteel[1]publishedbyAustralianInstituteofSteeloption.ThemajorityofhollowsteelsectionsusedinbuildingConstruction(AISC),oralternatively,usingsoftwareconstructionarenotlargeincross-sectionandtheplacementavailablefromtheFireSafetyDesignCompendiumCD[2]ofconvention

6、alreinforcementwithinthesesectionsispublishedbyOneSteel.unlikelytobecost-effective.Therefore,(b)and(c)arethepreferredwaysofenhancingthefireresistanceofSSHSTheabovethicknessesdonottakeintoaccountthebenefitscolumns.Thistechnicalnoteprovidesinformationtoallowofconcrete-fillin

7、g.Acombinationof(a)and(b)willresultindesignerstoassessthefireresistanceofSSHScolumnsmuchlowerthicknessesoffireprotectionasillustratedbywhenfilledwitheitherplainorfibre-reinforcedconcrete.IntestingconductedrecentlyatVictoriaUniversityofthecontextofthistechnicalnotetheterm"f

8、ire-resistance"Technology.shouldbetakenasrepresentingtheperformanceofacolumntestedunderst