Component Testing， Seismic Evaluation and Characterization of Buckling-Restrained Braces.pdf

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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,¯exuralbeamsandotherconsistedofaconventionalbraceencasedin