基于空間變化特性的地震動(dòng)模擬及懸索橋地震反應(yīng)分析.pdf

1、大連理工大學(xué)碩士學(xué)位論文基于空間變化特性的地震動(dòng)模擬及懸索橋地震反應(yīng)分析姓名：白宗琨申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：防災(zāi)減災(zāi)工程及防護(hù)工程指導(dǎo)教師：柳春光20070601基于空間變化特性的地震動(dòng)模擬及懸索橋地震反應(yīng)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