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1、華中科技大學碩士學位論文隔震曲線梁橋三維地震反應分析姓名：林凱申請學位級別：碩士專業(yè)：結構工程指導教師：李黎20070529華中科技大學碩士學位論文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華中科技大學碩士學位論文forcesofstructureunderthethree-dimensionalearthquakeexcitationmaybelargerthanthatundertheone-dimensionalexcitation,andseismicanalysisconsideringthree-dimensionalearthquakemotionmustbeperformedforthecurvedgriderbeam.Keywords:curvedgirderbridgescurvedbeamele
8、mentLead-Rubber-Bearingthree-dimensional
