摘要
Bridgeseismicisolationstrategyisbasedonthereductionofshearforcestransmittedfromthesuperstructuretothepiersbytwomeans:shiftingnaturalperiodandearthquakeinputenergyreductionbydissipationconcentratedinprotectiondevices.Inthispaper,astochasticanalysisofasimpleisolatedbridgemodelfordifferentbridgeanddeviceparametersisconductedtoassesstheefficiencyofthisseismicprotectionstrategy.Toachievethisaim,asimplenonlinearsofteningconstitutivelawisadoptedtomodelawiderangeofisolationdevices,characterizedbyonlythreeessentialmechanicalparameters.Asaconsequenceoftherandomnatureofseismicmotion,aprobabilisticanalysisiscarriedoutandthetimemodulatedKanai-Tajimistochasticprocessisadoptedtorepresenttheseismicaction.TheresponsecovarianceinthestatespaceisobtainedbysolvingtheLyapunovequationforastochasticlinearizedsystem.Afterasensitivityanalysis,thefailureprobabilityreferredtoextremedisplacementandthemeanvalueofdissipatedenergyareassessedbyusingtheintroducedstochasticindicesofseismicbridgeprotectionefficiency.Aparametricanalysisforprotectivedeviceswithdifferentmechanicalparametersisdevelopedforaproperselectionofparametersofisolationdevicesunderdifferentsituations.
出版日期
2005年01月11日(中国期刊网平台首次上网日期,不代表论文的发表时间)