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1、武汉理工大学硕士学位论文AbstractInreacentdays,withprestressedconcretebridgespanconstantlyincreasing,newtypeofbridgestructurekeepcoming,extradossedbridgeisoneofthem,itisaformofbridgebetweentheprestressedconcretebeambridgeandcable-stayedbridge,assuchlarge-spanbridgesarenewlyemerging,theirforceofdeformationunderea
2、rthquakearenotfullyunderstoodsostudyseimicresponseactionextradossedbridgeisnecessary.Weknowthatanystructurehavingavibrationdampingsystem,becauseexistingofdamping,bridgestructurewillproducevibrationenergydissipation,ithasaveryimportantinfluenceonthebridgestructuralresponseunderearthquake,thentheinflu
3、enceofdampingontheseismicresponseofextradossedpsgbridgeisalsoveryimportant.Whendoingresponsespectrumanalysis,usingdifferentdampingratio,seismicresponseanalysisofbridgestructurewillbedifferent,inaddition,provisionsof08seismicdesignspecifications,forthepurposesofconcretebeambridge,dampingratiovaluesge
4、nerally,thecable-stayedbridgeduetostructuralsomewhatflexible,dampingratiovaluesgenerally0.03,themechanicalcharacteristicsofextradossedbridgeisbetweenbeambridgeandcable-stayedbridge,whenmakingitsseismicresponseanalysis,dampingratiovaluesshouldbedifferentfromthetraditionalgirderbridgesandcable-stayedb
5、ridge.Forextradossedbridge,whenmakingtheresponsespectrumanalysismethodtoanalyzetheseismicresponse,analysisusingtheCQCmodalcombinationdoesnotguaranteetheaccuracyoftheanalysisresults,Therefore,responsespectrumanalysismethodcannotcompletelyreplacethehistoryanalysis;atthesametime,duringthetimehistoryana
6、lysis,enterdifferentseismicwaveswillhaveahugeimpactontheresults,Andseismiccodedefinesthattimehistoryanalysisresultsdonotreflectthestatisticalcharacteristicsofthestructure,itisjustasampleofrandomresponse,apluralityofsamplestobeanalyzedforstatisticalstructure,soastogetareliableresults.Forthesereasons,
7、duringextradossedbridgeseismicresponseanalysis,usingtwomethodsofanalysisatthesametime,weshouldanalyzetheresultsofthetwoIII万方数据武汉理工大学硕士学位论文methodsandcheckeachother,seismicresponseanalysisofthefinalresu