大跨预应力混凝土斜拉桥计算分析

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1、西南交通大学硕士学位论文大跨预应力混凝土斜拉桥计算分析姓名：贾山申请学位级别：硕士专业：桥梁与隧道工程指导教师：杨永清20080501西南交通大学硕士研究生学位论文第1l页AbstractThecable—stayedbridgeisatlindeterminatestructure丽t11llighdegrees，andthes缸uctureanalysisofthecable-stayedbridgeiscomplicated．Constructionmethodiscloselyrelatedtothe

2、internalforcesanddeformationofthebridge．Duringconstructioncourse，inordertoke印thebridgesafeandthedeformationofthebridgereasonable，theconstructioncontroloflarge-spanprestressedconcretecable-stayedbridgesbecomesanimportantresearchsubject．Theaccuratemodelshould

3、beconstructedandtheeffectivestructuralanalysismethodshouldbetakentoanalyzeandstudythestructuralbehaviorintheconstructionstageandservicestageofcable-stayedbridges．Thethesis，takingtheYongjiangBridgeonthehighwayaroundNingbocityasbackgroundexample，establishesas

4、patialfiniteelementmodelbyusinglargescalefinitedementanalysissoftwareMidas／Civil，andanalyzesthestructurebehavior,basedonthefininteelementtheoryofbridge．Determiningthereasonabledesignstateisthepreconditionofthedesignandcomputingofthecable—stayedbridge．Firstl

5、y,thereasonabledesignstateofYongjiangBridgeisdeterminedbytheminiInunlbendingenergymethod，andsomeunreasonablecableforcesareoptimizedandadjusted．Theresultsshowthatthemethodiseffective．Secondly,themodelsimulatingtheconstructionprocessisestablishedaccordingtoth

6、eacturalconstructionprocess，andtheinitialcableforceinconstructionstageisdeterminedbyusingforwardmethod,whichisasimplemethodtousebysimulatingforwardconstructionprocess．Theinitialforcesofcablesgainedbytheforwardingmethodmayapproachreasonableforceseasilyandens

7、uretheshapeofsla-ucture．nlirdly,，thethesisstudiesthesn眦turebehaviorsinconstructionprocessof西南交通大学硕士研究生学位论文第llI页thebridge，andvariouseffects，includingdeadload,concretecreepandshrinkage，prestressingforcesetc．，onthestructurebehavioraleconsidered．Throughtheanaly

8、sisonthedeformationofthebridge，thetheoreticalvaluesofelevationofmainbeamsegmentsaregained,whicharethetargetsofconstructioncontr01．Theanalysisofstressanddeformationshowsthatthebridgeissafeinconstruction