双线铁路连续钢桁梁桥结构计算和活动纵梁局部损伤分析-研究

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1、西南交通大学硕士研究生学位论文第

2、I页AbstractBasedontheresearchbackgroundofCaojiaquanYellowRiverBridgeinJinancity,whichisadouble—linerailwayandfour-spancontinuedsteeltrussbeam，、)l，inlthehelpoffiniteelementsofhvare，awholeanddetailedbeamelementmodelisbuiltup，thenstaticandd

3、ynamicperformanceandstabilityareanalyzedinthestageofconstructionandoperationinthisthesis．Amovablestringer'slocaldetailedsolidelementmodelisestablished，andplatesstressiscountedafterbeingforceddisplacement，SOthathereasonofmovablestringer'sdamageisanalyzed

4、．Intheperiodofthesteeltrussbridgeconstruction，consideringkeyconditionssuchasthemaximumcantileverpositionofeveryspanandsystemconversion，bridgedeformation，interiorforceandstressofmainmembersarecalculatedtocheckoutthesafetyofbridgeassembly．Withtheconsidera

5、tionthattrainliveloads，lateralswayingforceoftrain，brakingforce(tractionforce)，transversewindforce，temperatureeffectandSOon，afterninecombinationsarecompletedaccordingtotwotypes，mainforceandmainforceplusadditionalforce，theinteriorforce，stressanddeformatio

6、nofmainmembersofbridgeareanalyzedtocheekoutthesafetyofbridgeduringoperationphase．Inordertogainthefeaturesofstructuralnaturaloscillation，suchasstructuralfundamentalfrequency,vibrationmodeandqualityparticipationrateandSOon，bridgedynamiciscalculated．Earthq

7、uakeresponseareapplyingwithresponsespectrummethodandtimehistorymethod，tocheckouttheperformanceofbridgeanti·seismic．Elasticstabilityofbridgesarecalculatedtocheckoutthestabilityofbridgeatdifferentstages，suchascantileverassemblystage，completedstageandopera

8、tionstage．Whenmovablestringer’Sdamageisanalyzed，therelativedisplacementofnodesoflateralbracingbetweenmovablestringersiscalculated，underthetrainliveloadfirstly；andthenthestressofcorrespondingmembersissketchedwhenthesamedisplacementisexertedcoercivelyonth

9、elocaldetailsolidelementmodel；finallyafterthestressbeinganalyzedthemainreasonofthedamageinlateralbracingisfounout．Keywords：railwaycontinuedsteeltrussbridge；structuralanalysis；finiteelement；constructionphasecalculation；operationph