A NEW HYSTERESIS MODEL FOR STEEL MEMBERS

SUMMARY Since it is not economical to design structures to respond to earthquake loads in their elastic range,dissipationofenergybypost-elasticdeformationhasbeenrecommended.Thisrequiresanunderstandingofthe hysteretic behaviour of structural members. A mathematical model is proposed for the hystereticresponseof steelmembers. The model is based on a pre-de"ned skeleton curve,and consists of a linearanda non-linear region. The linear region is twice the elastic length on the skeleton curve, while the non-linearregionis formed bysuperimposinganellipticaldissipationfunctionon the skeletoncurve. Theshapeof theproposed dissipation function and the hysteretic loops are compared with experimental results. Goodagreementhas beennoted.Furthermore,itis shownthatsti!nessdegradationcan beeasilyincorporatedinthe model. While the model can currently by used in the analysis of accumulated damages for steelstructures, it has the potential to be extended to reinforced concrete structures, as well. Copyright ( 1999John Wiley & Sons, Ltd.

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