斜拉桥midas civil仿真分析第二部分

TutorialFinalandForwardConstructionStageAnalysisforaPCCable-StayedBridge(PartII)CCCiiivvviiilllADVANCEDAPPLICATIONSTableofContentsSummary......................................................................................................................................1Bridgedimensions...............................................................................................................................................2Constructionstages.............................................................................................................................................3DefinitionofProperties...............................................................................................................4DefinitionofMaterialProperties.......................................................................................................................4Definitionoftime-dependentmaterialproperties...........................................................................................5DefinitionofStructureGroups...................................................................................................6Constructionstagesofthecantilevers................................................................................................................6Definitionofcompositesectionforconstructionstage..................................................................................10DefinitionofBoundaryGroups................................................................................................13Boundaryconditionstobeusedinconstructionstages..................................................................................13InputBoundaryGroup.....................................................................................................................................14Inputtemporaryboundaryconditions.............................................................................................................15DefinitionofLoadGroups........................................................................................................17Loadcasestobeusedinconstructionstages..................................................................................................17Inputloadingsconsideringconstructionstages...............................................................................................18ConstructionStageAnalysis....................................................................................................22Defineconstructionstages................................................................................................................................22Constructionstageanalysis...............................................................................................................................24Reviewanalysisresults............................................................................................................25Reviewdeformedshapes..................................................................................................................................25Reviewmemberforces......................................................................................................................................26Reviewanalysisresultsofcompositegirders...................................................................................................27FinalandForwardConstructionStageAnalysisforaPCcable-stayedbridge(PartII)1SummaryIntheinitialcablepretensionanalysisofaPCcable-stayedbridge,initialcableforcesarecalculatedbasedonthecompositesectionpropertiesofgirdersandslabs.Ifalargemagnitudeofcablepretensionisintroducedatonceatthestagewhenonlythegirderisinstalledinconstructionstageanalysis,thecableforcescanbecontrolledeffectivelybecausethecablepretensionatthe2ndstageoftensioningisquitesmall.However,excessivemomentsmayoccurandtheslopeofthegirdermaybecomelarge,whichcancausecrackingoftheslab.Inordertoreflectthiskindofconstructionfeaturesinthemodel,itisnecessarytoperformconstructionstageanalysisreflectingthesectionpropertiesbeforeandafterthecompositeactionandappropriatelydistributedcabletensionsover1stand2ndtensioning.Thistutorialshowstheconstructionstageanalysisprocessconsideringthesectionpropertiesbeforeandafterthecompositeaction,byusingthe“CompositeSectionforConstructionStage”function.a)girderinstallationb)cableinstallationand1sttensioningc)slabcastingd)slabcuringand2ndtensioningFigure1.ConstructionStageCycleADVANCEDAPPLICATIONS2Figure2.AnalysismodelBridgedimensionsThistutorialhasbeenbasedonarealprojectofaPCcable-stayedbridge,andhasbeensimplified.WearegoingtoreviewthemainfeaturesofMIDAS/Civilfortheconstructionstageanalysiswiththecablepretensionforcescalculatedinaninitialcableforcesanalysis.Thedataforthebridgeareasfollows.Bridgetype:PCcable-stayedbridgeBridgelength:L=46.5+113.5+260.0+100.0=520.0m2sidesofcables,diamondshapetowerMaingirder:BeamandSlabtypeconcretesectionsTower:concretesectionsNumberofcables:52×2sides=104Install4Keyblocksinspans