简介：ＦｌｕｃｔｕａｔｉｏｎｏｆＥｘｃｉｔａｔｉｏｎＦｕｎｃｔｉｏｎｓｏｆＤａｍｐｅｄＰｒｏｄｕｃｔｓｏｆＩｄｅｎｔｉｆｉｅｄＩｓｏｔｏｐｅｓ￥ＷａｎｇＱｉ；ＬｕＪｕｎ；ＸｕＨｕｓｈａｎ；ＬｉＳｏｎｇｌｉｎ；ＺｈｕＹｏｎｇｔａｉ；ＹｉｎＸ...

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简介：

简介：Fundamentalprinciplesfromstructuraldynamics,randomtheoryandperturbationmethodsareadoptedtodevelopanewresponsespectrumcombinationrulefortheseismicanalysisofnon-classicallydampedsystems,suchasstructure-dampersystems.Theapproach,whichisnamedtheperturbationspectrummethod,canprovideamoreaccurateevaluationofanon-classicallydampedsystem'smeanpeakresponseintermsofthegroundresponsespectrum.Toaccountfortheeffectofnon-classicaldamping,allelementsareincludedintheproposedmethodforseismicanalysisofstructure,whichisusuallyap-proximatedbyignoringtheoff-diagonalelementsofthemodaldampingmatrix.Moreover,ashasbeenadoptedinthetraditionalCompleteQuadraticCombination(CQC)method,thewhitenoisemodelisalsousedtosimplifytheexpressionsofperturbationcorrelationcoefficients.Finally,numericalworkisperformedtoexaminetheaccuracyoftheproposedmethodbycomparingtheapproximateresultswithexactonesandtodemonstratetheimportanceoftheneglectedoff-diagonalelementsofthemodaldampingmatrix.Intheexaminedcases,theproposedmethodshowsgoodagreementwithdirecttime-historyintegration.Also,theperturbationspectrummethodleadstoamoreefficientandeconomicalcalculationbyavoidingtheintegralandcomplexoperation.

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