定常流作用下拉索式悬浮隧道单节管段的振动初探

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1、西南交通大学硕士学位论文定常流作用下拉索式悬浮隧道单节管段的振动初探姓名：胡鸿运申请学位级别：硕士专业：桥梁与隧道工程指导教师：周晓军20080501西南交通大学硕士研究生学位论文第1I页AbstractSubmergedFloatingTunnel(SFT)hasmuchmorecomprehensiveadvantagesthanthetraditionalCROSS—trafficstructures．Thecable-SFTshouldhavewideexpansiveprospectsinvirtueofitsflexibleform

2、s，whichcallforitsin—depthstudy．Inthispaper,theauthorhasconductedanumberofpreliminarytheoreticalstudiesondynamicresponsesofthecylindricalcable-SFTsubjectedtothesteadyflow,andintheend，getssomepreliminarytheoryresults．Firstly,aSFTmechanicalmodelisestablishedaccordingtotheforcec

3、haracteristicsofthecylindricalcable-SFTsubjectedtothesteadyflow．Inthemodel，thepracticalassumptionsaregivenbelow：thesinglesegmentofSFTissimplifiedasasolidbody,thenlinearspringanddamperaresetuponthesolidbodytosimulaterestrictioninflictedbyothersegments，andthenaturalfrequencyof

4、thesolidbodyisequivalenttothenaturalfrequencyoftheSFTwhichsimplifiedasaelasticsimplebeam；thecablesaresimplifiedastensionstrings，everyfourofwhicharelocatedonasegmentandaresymmetricabouttheverticalplaneofthesegmentaxis；accordingtotheaxisofthesegmentandthevibrationengenderedint

5、heplaneformedbycables；thesteadyflowishorizontalandperpendiculartothesegmentaxis；thevibrationissymmetricaboutthecableplane．Secondly，onthebasisoftherevisedMorisonformulaandNewton’Smechanicslaws，agroupofdifferentialdynamicalequationsforthemechanicalmodelarededuced，namelyamathem

6、aticsmodelofasinglesegmentintheSFTsubjectedtothesteadyflow．Thensimplifythegroupofdifferentialequationsandsolveitbynumericalanalysistheory；thesolvingprocessislullby‘‘Circular4Cables—SFTCalculator'’，asmallvaluecalculatorprogrammedbytheauthor．Finally,inthepaper,referringtothera

7、ilwayone-lanetunnel，relatedparametersareset．Aftertakingthevelocityofsteadyflowandtheanglebetweencableandflow吼asdiscretevariables，andcalculatingthemodelfor145timesandeverytimefor3000s，when吼∈(30。，70。)andV《O．0015m／s，0．45m／s]，someprimaryconclusionsareeducedbyanalyzingthecalculat

8、ionresults：with西南交通大学硕士研究生学位论文第1Ⅱ页theincreaseof以，thedisplacementofthesegmen