大跨度钢管混凝土拱桥自振特性及地震响应分析

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1、西南交通大学硕士学位论文大跨度钢管混凝土拱桥自振特性及地震响应分析姓名：王沛耘申请学位级别：硕士专业：桥梁与隧道工程指导教师：刘元久20080601Abstract．Inrecentyears，withthecontinuousimprovementonthetheoryofconcretefiUedsteeltube(CFST)，theapplicationofCFSTarchbridgehasagreatdevelopment，buttheanti．seismicanalysisforCFSTarchbridgewi

2、thlargespanisstillaproblemwhichneedstobestudieddeep．Atpresent，there15nocleardescriptionaboutanti—seismicproblemofCFSTarchbridgeinChinesecode．Withreferel'leetopapersaboutanti—seismicproblemofbridge，studiesonseismicresponseofCFSTarchbridgeisstillveryfew．Aimingtonat

3、uralvibrationCharacteristicandseismicresponseofCFSTarchbridgewithlargespan，thefollowingseveralaspectsarestudiedinthepaper．1．TakingNanningBridge(CFSTarchbridgewiththespanof38m)aSallexample，establishfiniteelementmodelforseismicresponseanalysisbygeneral缸teel锄entsoft

4、wareANSYS．Naturalfrequencyofthisbridgeiscalculatedausthebasisofdynamiccalculationwithtakingtheinfluenceofhorizontalbracingstiffiaess，archribstiffnessandsuspendersintoaccount·2．AccordingtogeologicalconditionofNanningBridgeandcombiningwithnomseismicresponsespectrum

5、，drawspectrumcurveandcalculatethebridge’Sresponseundertheimpactoflongitudinal，transversalandverticalseismicloadrespectively．Workingstatusofbridgestructuresisalsoresearchedunderthemostadverseseis面c10adcombination．Fromtheanalysis，theinfluenceofverticalseismicloadon

6、structuresCannotbeignored．3．Seismicresponseofthebridgeunderuniformexcitationandtravelingwaveeffectisanalyzedbymakinguseoftimehistoryanalysismethod．ThemaximumandtheDlaceofthemaximumofarchbridgeseismicresponseisdifferent．Duringseismicanalysis，seismicresponsewillbec

7、omelargeifverticalseismicloadandtravelingwaveeffectisconsidered．ThereforeitisverynecessarytoconSlderverticalseismicloadandtravelingwaveeffect．4．ConstitIltiverelationsofCFSTareestablishedaccordingt．OtheanalysisofbridgenonlinearfactorsaSwellaSrelatedcodes．BasedOnth

8、eseismicresponseanalysisofNanningBridgewithconsideringmaterialnonlinearfactors，geometry西南交通大学硕士研究生学位论文第1II页nonlinearfactorsandthecombinationofabovetwononlinear