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1、ComponentTesting,SeismicEvaluationandCharacterizationofBuckling-RestrainedBraces123CameronJ.Black,M.ASCE;NicosMakris,M.ASCE;andIanD.Aiken,M.ASCEAbstract:Thispaperreportsontheresultsfromacomprehensivecomponenttestingprogramonatypeofbuckling-restrainedbraceknownastheUnbondedBrace?.Theexperimentald
2、ataareusedto:~1!verifytheresultsoftheoreticalpredictionsonthestructuralstabilityofthebraces;~2!validatetheinelasitccapacityofthebracesundersevereearthquakedemands;and~3!calibrateamacroscopichystereticmodelthatisfoundtopredict,with?delity,thebraceforce±displacementbehavior.Thestudyconcludesthatth
3、eunbondedbraceisareliableandpracticalalternativetoconventionalframingsystemstoenhancetheearthquakeresistanceofnewandexistingstructures;capableofprovidingboththerigidityneededtosatisfystructuraldriftlimits,whiledeliveringasubstantialandrepeatableenergyabsorptioncapability.DOI:10.1061/~ASCE!0733-9
4、445~2004!130:6~880!CEDatabasesubjectheadings:Seismictests;Buckling;Bracing;Experimentaldata.Introductionprovideslateralsupporttothecoreandpreventsglobalbuckling.Manyofthestructuralfailuresinbuildingsduringstrongearth-Athinlayerofmaterialalongthesteelcore/concreteinterfacequakeshakinghaveindicate
5、dthatsustainablestrengthandstableeliminatessheartransferduringtheelongationandcontractionofenergydissipationcapabilityaremostdesirabletomaintaininter-thesteelcoreandalsoaccommodatesitslateralexpansionwhenstorydriftsandoverallstructuraldisplacementswithintolerableincompression.Itistheabilityofthe
6、steelcoretocontractandlevels.Theideaofusingyieldingmetallicdeviceswithintheelongatefreelywithinthecon?ningsteel/concrete-tubeassemblyskeletonofabuildingframetoabsorblargeportionsoftheseis-thatleadtothenameunbondedbrace.micenergyismorethan30yearsold~Skinneretal.1975;KellyAnearlyattempttocreateabr
7、acethatdissipatesenergyyetetal.1992!.ThisearlyworkintheareaofseismicprotectionofdoesnotbuckleisreportedbyKimuraetal.~1976!.Thebracestructuresconsideredtorsionalbeams,ˉexuralbeamsandotherconsistedofaconventionalbraceencasedin
