Probabilistic basis for 2000 SAC Federal Emergency Management Agency steel moment frame guidelines.pdf

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1、ProbabilisticBasisfor2000SACFederalEmergencyManagementAgencySteelMomentFrameGuidelines123C.AllinCornell,M.ASCE;FatemehJalayer;RonaldO.Hamburger,M.ASCE;4andDouglasA.Foutch,M.ASCEAbstract:Thispaperpresentsaformalprobabilisticframeworkforseismicdesignandassess

2、mentofstructuresanditsapplicationtosteelmoment-resistingframebuildings.Thisistheprobabilisticbasisforthe2000SACFederalEmergencyManagementAgency~FEMA!steelmomentframeguidelines.Theframeworkisbasedonrealizingaperformanceobjectiveexpressedastheprobabilityofexc

3、eedingaspeci®edperformancelevel.Performancelevelsarequanti®edasexpressionsrelatinggenericstructuralvariables``demand''and``capacity''thataredescribedbynonlinear,dynamicdisplacementsofthestructure.Commonprobabilisticanalysistoolsareusedtoconvolveboththerando

4、mnessanduncertaintycharacteristicsofgroundmotionintensity,structural``demand,''andstructuralsystem``capacity''inordertoderiveanexpressionfortheprobabilityofachievingthespeci®edperformancelevel.Stemmingfromthisprobabilisticframework,asafety-checkingformatoft

5、heconventional``loadandresistancefactor''kindisdevelopedwithloadandresistancetermsbeingreplacedbythemoregenericterms``demand''and``capacity,''respectively.Thisframeworkalsoallowsforaformatbasedonquantitativecon®dencestatementsregardingthelikelihoodoftheperf

6、ormanceobjectivebeingmet.ThisformathasbeenadoptedintheSAC/FEMAguidelines.DOI:10.1061/~ASCE!0733-9445~2002!128:4~526!CEDatabasekeywords:Steelframes;Probabilisticmethods;Moments;Seismichazard.Introduction1994!,theprobabilisticanalysisseparatelycharacterizesbo

7、ththerandomnessandtheuncertaintyindemandandcapacity.BasedThispaperpresentstheformalprobabilisticbasisbehindthenewontheseassessmentstheengineerisprovidedintheseguidelinesperformance-basedseismicdesignandassessmentguidelinesforwithacon®dencestatementwithrespe

8、cttothelikelihoodofun-steelmomentframebuildingspreparedbytheSACFederalacceptablebehavior.AmoredetailedpresentationofthisandEmergencyManagementAgency~FEMA!program~FEMAothersuchframeworksisprovidedbyJala