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1、北京交通大學碩士學位論文大跨度結(jié)構在多點地震動激勵作用下的反應分析姓名：李云申請學位級別：碩士專業(yè)：橋梁與隧道工程指導教師：鐘鐵毅20080601英文摘要ABSTRCTThegroundmotionisacomplicatedtime-spaceprocess．Therearesomecharactersabouttheseismicintheprocessofpropagation，suchasincoherenceeffect，wave-passageeffect，site-responseeff
2、ectandattenuationaffectetc．Ithasbeenverifiedthatthegroundmotionsinputtingatdifferentsupportsoflong-spanstructuresaredifferent，whichmaybemodeledbyphaseshiftsandcoherencylosses．Thephaseshiftsarecausedbywavespropagating,whilethecoherencylosescanbeattribute
3、dtomanyfactorssuchassourcemechanism，pathandlocalsiteeffects，ere．Significantcontributionsontheseissueshavebeenmade，andstudiesonresponseoflongspanstructureshaveshownthattheeffectsofmulti．supportexcitationsmustbeconsidered．Inthepaperthemulti-supportexcitat
4、ion(wave-passageexcitation)isusedintheanalysis，themaincontentsofthisdissertationaredeseribedasfollows：1．Thestudyofmulti-supportexcitationanalysesapproach．Severalanalysismethodsusedtocalculatetheearthquakeresponseofstructures，suchastimehistorymethod，resp
5、onsespectrummethod，randomvibrationmethod．a(chǎn)reintroducedanddiscussed．Thepracticalapplicationofdynamicbalanceequationsofmultipointexcitationarestudiedanddiscussedinthispapen2．Theresponsestotravelling．waveeffectofearthquakeaboutstructureswereanalysed．Contra
6、stofthemulti—supportexcitationtouniformexcitation，theconclusionisthatthetravelling-waveeffectisveryimportantforthestructure．Thedifferentwavespeedsproducevarianteffects．Ingeneral，thelitteristhewavespeed，thebiggereffectistheinternalforce，butthedifferentwa
7、vespeedcausethevarianteffect．Andbetweendifferentwaves，delayphenomenaisoccured．Thetimeisdecidedbythedirectionofthetransmitingearthquakeswaveandthedistanceofthesupports．3．Aconclusionisdrawnthattheseismicresponseofthelong．．spanstructuresundermulti-supporte
8、xcitationsisgreatlydifferentfromthatunderconsistentexcitation．Thedetailedseismicanalysismustbecarriedoutinthedesignprocessofthelong．spanstructuresKeyWords：long-spanstructures；multi-supportexcitation；seismicanalysis；wavepassageeff
