Peak displacement patterns for the performance-based seismic design of steel eccentrically braced frames

(整期优先)网络出版时间:2019-02-12
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Performance-basedseismicdesign(PBSD)aimstoassessstructuresatdifferentdamagestates.Sincedamagecanbedirectlyassociatedtodisplacements,seismicdesignwithconsiderationofdisplacementseemstobelogical.Inthisstudy,simpleformulaetoestimatethepeakfloordisplacementpatternsofeccentricallybracedframes(EBFs)atdifferentperformancelevelssubjectedtoearthquakegroundmotionsareproposed.TheseformulaeareapplicableinaPBSDandespeciallyindirectdisplacement-baseddesign(DDBD).Parametricstudyisconductedonagroupof30EBFsunderasetof15farfieldandnearfieldaccelerogramswhichtheyscaledtodifferentamplitudestoadaptvariousperformancelevels.TheresultsofthousandsofnonlineardynamicanalysesofEBFshavebeenpost-processedbynonlinearregressionanalysisinordertorecognizethemajorparametersthatinfluencethepeakdisplacementpatternoftheseframes.Resultsshowthatsuggesteddisplacementpatternshaverelativelygoodagreementwiththoseacquiredbyanexactnonlineardynamicanalysis.