Beam-Column Element for Nonlinear Seismic Analysis of Steel Frames

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1、BEAM-COLUMNELEMENTFORNONLINEARSEISMICANALYSISOFSTEELFRAMES12ByKeeDongKimandMichaelD.Engelhardt,Member,ASCEABSTRACT:Thispaperdescribesabeam-columnelementintendedtomodelsteelmemberswith¯exuralyielding,aswellasmemberswithyieldingundercombined¯exureandaxialforceinframessubjecttoearth-quakegroundmoti

2、ons.Theelementhasthecapabilitytomodelplasticaxialdeformationandchangesinaxialstiffness,anditemployshardeningrulestohandlemonotonic,cyclic,orarbitraryloading.Whencomparedwithexperimentalresultsand®bermodelpredictions,theelementshowssigni®cantlybetterperformancethantypicalbilinearhingemodels.Thede

3、velopedelementcanmoreaccuratelypredictlocaldeformationdemandsandtheoverallresponseofstructuralsystemsunderearthquakeloadingthanthebilinearhingeelement.GENERALbehaviorinearthquakes(Schiff1988;TsaiandPopov1988;Schneideretal.1991;SAC1995a).Steelmomentresistingframes(MRFs)designedaccordingDespitethe

4、commonuseofthebilinearhingeelement,thetocurrentbuildingcodesareexpectedtodeformwellintotheaccuracyofthiselementforpredictingactualinelasticsteelinelasticrangeduringsevereearthquakegroundmotions.In-beamorbeam-columnresponseissomewhatlimited.Theac-elasticdeformationsofMRFsaretypicallyconcentratedi

5、ncuracyofthismodelcanbeevaluated,forexample,bycom-criticalregionsattheendsofgirdersandcolumnsandincol-parisonwithexperimentalresults,orbycomparisonwiththeumnpanelzones.Toaccuratelypredictthebehaviorofastruc-resultsofmoresophisticatedmodels.Inthefollowingpara-tureduringearthquakeexcitations,analy

6、ticalmodelsshouldgraph,theperformanceofthebilinearelementisbrie¯yin-properlydescribethehystereticbehaviorofthecriticalvestigated.regions.Atthesametime,thesemodelsshouldbecomputa-Figs.9and10(givenlaterinthepaper)compareanalyticaltionallyef®cientfornonlinearseismicanalysis.Thedevelop-predictionsus

7、ingKanaan'sbilinearelementwithcyclicload-mentofsuchananalyticalmodelforasteelbeam-columnisde¯ectionresponsesobtainedbyanexperiment(Engelhardtthesubjectofthisstudy.andHusain1992)andwitha®bermodel,respectively.TheThedesignphil