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1、华中科技大学硕士学位论文隔震曲线梁桥三维地震反应分析姓名：林凯申请学位级别：硕士专业：结构工程指导教师：李黎20070529华中科技大学硕士学位论文AbstractAsthedevelopmentofmodermtrafficsystem,curvedbridgesareadoptedmorewidely.Forthecomplexityandtheparticularity,researchofseismicdesignofcurvedbridgesisstillfaultiness.Thisthesispresentsaseismicresponse
2、studyofcurvedbridgesunderthree-dimensionalearthquakeexcitations.Andthemajorcontentisasfollows:Firstly,applytheProperOrthogonalDecompositionofthegroundmotionprocessesintheformofaspectralpropertransformation(SPT),andtheSPTofthe3-V1-Dgroundmotionprocessesateachpointofthespacedefines
3、anewsetofgroundmotionprocessescomponents,calledspectralpropercomponentsanduncorrelatedforanytimelag.Assuming,asseemsphysicallyreasonable,thatprincipalcomponentsuncorrelatedatonesinglepointremainuncorrelatedindifferentpoints,makesitpoffibletoobtainanewmodelofthetow-pointcoherencef
4、unctionofthedifferentseismicgroundmotionscomponentssoastocompletethestatisticalmodelofthe3-V,4-Dseismicgroundmotions.EmbeddingthespectralprincipalcomponentsinaMonteCarloframework,makesthismodelveryattractiveforthedigitalsimulationofseismicgroundmotion.Secondly,toincludethewarping
5、effectthecurvedbeamelementwitheightdegreesoffreedomisutilized.Theelementstiffnessmatrix,elementmassmatrixandseismicmassmatrixinthreedirectionsforbothgirderandpierelementshavebeenderived.Thebilateralcoupledrestoringforcemodelofleadrubberbearingsisintroduced,andtheelementstiffnessm
6、atrixforthebearingelementcanbederivedfromthismodelbytheRunge-Kuttamethod.Finally,MATLABprogramiscompiledtoconducttimehistoryanalysisofathree-span,continuouslycurvedgirderbridgeunderearthquake.Comparisonsaremadebetweenthree-dimensionalandsingle-dimensionalresponses.Itisshownthat:t
7、heinternalII华中科技大学硕士学位论文forcesofstructureunderthethree-dimensionalearthquakeexcitationmaybelargerthanthatundertheone-dimensionalexcitation,andseismicanalysisconsideringthree-dimensionalearthquakemotionmustbeperformedforthecurvedgriderbeam.Keywords:curvedgirderbridgescurvedbeamele
8、mentLead-Rubber-Bearingthree-dimensional
