简介：Theobjectiveofthisstudyistoidentifysystemparametersfromtherecordedresponseofbaseisolatedbuildings,suchasUSChospitalbuilding,duringthe1994Northridgeearthquake.Fullstatemeasurementsarenotavailableforidentification.Additionally,theresponseisnonlinearduetotheyieldingofthelead-rubberbearings.Twonewapproachesarepresentedinthispapertosolvetheaforementionedproblems.First,areducedorderobserverisusedtoestimatetheunmeasuredstates.Second,aleastsquarestechniquewithtimesegmentsisdevelopedtoidentifythepiece-wiselinearsystemproperties.Theobserverisusedtoestimatetheinitialconditionsneededforthetimesegmentedidentification.Aseriesofequivalentlinearsystemparametersareidentifiedindifferenttimesegments.Itisshownthatthechangeinsystemparameters,suchasfrequenciesanddampingratios,duetononlinearbehaviorofthelead-rubberbearings,arereliablyestimatedusingthepresentedtechnique.Itisshownthattheresponsewasreducedduetoyieldingofthelead-rubberbearingsandperiodlengthening.
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