基于空間變化特性的地震動模擬及懸索橋地震反應分析.pdf

1、大連理工大學碩士學位論文基于空間變化特性的地震動模擬及懸索橋地震反應分析姓名：白宗琨申請學位級別：碩士專業(yè)：防災減災工程及防護工程指導教師：柳春光20070601基于空間變化特性的地震動模擬及懸索橋地震反應分析SimulationofEarthquakeMotionBasedonSpatialVariableEffectsandSeismicResponseofSuspensionBridgeAbstractGroundmotioniS

2、arandomprocessinbothspaceandtimeItstimedependentpropertieshavebeenmorethoroughlystudiedbutthevariabilitiesinspacehavebeennotForcommonbuildings，itisreasonablethatthespatialvariationofgroundmotionisneglectedinseismicanalys

3、isbecausethesizeoffoundationalonghorizoniscomparativelysmallHoweverforextendedstructures，thespatialvariationofgroundmotionmayproducerelativelygreateffectontheresponseofstructuresIfthisvariationisnotconsideredthecalculate

4、dresultswillbeunreliableinseismicdesignofstractaresTheseismicresponsespectraanalysisadoptedinthedesigncriterionofbridgesonlyconsiderstheeffectoftheuniforillearthquakeexcitationButinrealearthquakestheteaIgroundmotioninput

5、sofeverybearingpointsofthebridgearedifferentbecauseofthediversitiesoftheseismic50Brces，propagationpathsofearthquakewavesandlocalsiteconditionsThereforeit’snecessarytoanalyzethebridgesunderthemultipointexcitations(1)111ei

6、mportantparametersandmodelsusedforcomposingtimehistoryofgroundmotionarcintroduced，andthentheadvantagesanddisadvantagesofvariousmodelsandtheirapplicabilityarediscussed(2)GroundmotionsimulationThegroundmotionsimulatlonofsi

7、nglepointexcitationgenerallyusedinearthquakeengineeringisfirstlyintroduced，andthenitbeginstotransfertothemultipointexcitationThecoherencefunctionisusedteflectthecoherenceofseismicsourcesandmeasuredpoints，andtheapparentve

8、locityisusedforthemulti—pointsimulationofwavepassageeffectbuttheyCan’taccuratelysimulatethecoherenceandthelocalsiteeffectsThentheequivalentpowerspectrumisadoptedtosimpli移thepowerspectrummatrixbutthecoherenceofcomposedtim

9、ehistoryofgroandmotionisnotgoodAnewmethodofsimulationisproposedItisdevelopedbasedonthegroundmotionsimulationconsideringthespatialcoherenceItCansimulatethetimehistoryofgroundmotionaccordingwimtherequirementofmultipointexc

10、itationandabletoreflectthenonstationurityofthetimefrequencydomainofgroundmotion，thelocalsiteeffects，partialcoherenceeffectsandwavepassageeffects(3)nethreemethodsofseismicresponseanalysisundermultipointexcitations，suchasr