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时间:2019-03-12
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1、DesignofBuckling-RestrainedBracedFramesUsingNonlinearTimeHistoryAnalysisandOptimization123RichardJ.Balling,P.E.;LukasJ.Balling;andPaulW.Richards,P.E.,M.ASCEAbstract:Aprocedureforthedesignofbuckling-restrainedbracedframesispresented.Theprocedureusesnonlineartimehistoryanalysisandoptimization.Re
2、sultsfromthisprocedurearecomparedtothosefromthecommonlyusedequivalentlateralforceprocedure.Resultsareusedtodevelopdesigncurvesandformulasforrapiddeterminationofcross-sectionalareasforbuckling-restrainedbracesineachstory.Oneinterestingresultisthattheoptimumvariationofareafromstorytostoryisnearl
3、ylinearformostcasesstudied.Thisresultisnotpredictedbytheequivalentlateralforceprocedure,andcanonlybediscoveredthroughoptimizationandnonlineartimehistoryanalysis.DOI:10.1061/ASCEST.1943-541X.0000007CEDatabasesubjectheadings:Bracing;Frames;Buckling;Optimization;Algorithms;Timefactors;Nonlinear
4、analysis.IntroductionThispaperpresentsaprocedurefordeterminingtherequiredcross-sectionalareasofBRBsinBRBFsthatusebothNTHTheuseofbuckling-restrainedbracesBRBsasameansofre-analysisandoptimization.ThisdesignprocedurewillbereferredsistinglateralseismicloadinghassigniÞcantlyincreasedinrecenttoast
5、henonlineartimehistoryandoptimizationNTHOproce-years.ThisisbecausetheyhavesigniÞcantadvantagesoverspe-dure.DesignsobtainedbytheNTHOprocedurewillbecomparedcialconcentricbraces,whichsufferlossofstrengthandstiffnesstothoseobtainedbytheELFprocedure.afterthebracesbuckleincompressionSEAOC1999.AB
6、RBThispaperislimitedtolow-riseBRBFswithÞvestoriesorconsistsofasteelcoresurroundedbyanoutercasingthatre-less.Thisisbecausetheresponseinlow-riseBRBFsduetolateralstrainslocalbuckling,butallowsthecoretodeforminelasticallyloadingisdominatedbytheaxialstiffnessandstrengthoftheintensionandcompressionu
7、nderstrongearthquakeloading.Itbracesratherthanbytheaxialandßexuralstiffnessofthecol-hasbeenexperimentallydemonstratedthatBRBsarecapableofumnsandgirders.Inhigh-riseframes,theaxialstiffnessofthedevelopingadequateductileresponseinbothtensi
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