关于斜拉桥的中英文翻译学士学位论文.doc

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1、Studyonnonlinearanalysisofahighlyredundantcable-stayedbridge1．AbstractAcomparisononnonlinearanalysisofahighlyredundantcable-stayedbridgeisperformedinthestudy.Theinitialshapesincludinggeometryandprestressdistributionofthebridgearedeterminedbyusingatwo-loopiterationmethod

2、,i.e.,anequilibriumiterationloopandashapeiterationloop.Fortheinitialshapeanalysisalinearandanonlinearcomputationprocedurearesetup.Intheformerallnonlinearitiesofcable-stayedbridgesaredisregarded,andtheshapeiterationiscarriedoutwithoutconsideringequilibrium.Inthelatterall

3、nonlinearitiesofthebridgesaretakenintoconsiderationandboththeequilibriumandtheshapeiterationarecarriedout.Basedontheconvergentinitialshapesdeterminedbythedifferentprocedures,thenaturalfrequenciesandvibrationmodesarethenexaminedindetails.Numericalresultsshowthataconverge

4、ntinitialshapecanbefoundrapidlybythetwo-loopiterationmethod,areasonableinitialshapecanbedeterminedbyusingthelinearcomputationprocedure,andalotofcomputationeffortscanthusbesaved.Thereareonlysmalldifferencesingeometryandprestressdistributionbetweentheresultsdeterminedbyli

5、nearandnonlinearcomputationprocedures.However,fortheanalysisofnaturalfrequencyandvibrationmodes,significantdifferencesinthefundamentalfrequenciesandvibrationmodeswilloccur,andthenonlinearitiesofthecable-stayedbridgeresponseappearonlyinthemodesdeterminedonbasisoftheiniti

6、alshapefoundbythenonlinearcomputation.2.IntroductionRapidprogressintheanalysisandconstructionofcable-stayedbridgeshasbeenmadeoverthelastthreedecades.Theprogressismainlyduetodevelopmentsinthefieldsofcomputertechnology,highstrengthsteelcables,orthotropicsteeldecksandconst

7、ructiontechnology.Sincethefirstmoderncable-stayedbridgewasbuiltinSwedenin1955,theirpopularityhasrapidlybeenincreasingallovertheworld.Becauseofitsaestheticappeal,economicgroundsandeaseoferection,thecable-stayedbridgeisconsideredasthemostsuitableconstructiontypeforspansra

8、ngingfrom200toabout1000m.Theworld’slongestcable-stayedbridgetodayistheTatarabridgeacrosstheSetoInlandSea,linki