大跨度结构在多点地震动激励作用下的反应分析

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1、北京交通大学硕士学位论文大跨度结构在多点地震动激励作用下的反应分析姓名：李云申请学位级别：硕士专业：桥梁与隧道工程指导教师：钟铁毅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．areintroducedanddiscussed．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