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1、ERECTIONOFCABLE-STAYEDBRIDGESHAVINGCOMPOSITEDECKSWITHPRECASTCONCRETESLABS1ByM.SchlaichABSTRACT:Fortheconstructionofcompositesteel-concretedecksofcable-stayedbridges,methodsoferectionandanalysishavetobeappliedthat,uponcompletionofthedeck,accuratelyyieldtheprescribeddeadloadcon®gurationofthe
2、deckregardinggeometryandforces.Duringdeckerection,nounwantedbendingmomentsshouldbelockedintothecompositesectionswhentheconcreteslabisconnectedtothesteelsubstructure.Suchlocked-inmomentswouldbendthedeck,causeconcretecreepthatisdif®culttopredict,andintroducetheriskofdeviationsfromthedesiredd
3、eckalignmentandthecorrespondingdistributionofforces.Thispaperpresentsasimpleandpracticalmethodoferectionanderectionanalysisforcompositedeckswithprecastconcreteslabs.Atwo-steptensioningprocedureofthestaycablesisproposedthatminimizestheeffectsofunwantedlocked-inmoments,makingiteasytopredictt
4、hegeometryoftheerectionstagesandtoyieldthedesireddeadloadcon®gurationofthedeck.ThemethodwassuccessfullyappliedfortheerectionoftheTingKaubridgeinHongKong,acable-stayedbridgeof1,200minlengthhavingacompositedeckwithaprecastdeckslab.INTRODUCTIONsecond,theheavyconcreteslabisplacedusingthesteelg
5、ridaspermanentframework.Atspansbeyondabout700m,theSincethe1950salargenumberofcable-stayedbridgeswithcompositedeckbecomestooheavy,andthesteelgirderwithconcreteorcompositesteel-concretedeckshavebeenbuilt,anorthotropicdeckremainstheonlyeconomicalchoice.andtheirdesignandconstructionmethodsarew
6、ellestablished.Theverticalalignmentofthebridgedeckisusuallypre-However,themethodsforerectionanderectionanalysisofscribedbythedesigneroftheroad.Thebridgewillbebuiltcompositesteel-concretedecksarenotcoveredextensivelyinstagebystage.Uponcompletion,underalldeadloadsandtheliterature,especiallyr
7、egardingtheinclusionoflocked-inwhenalltime-dependentdeformationshavetakenplace,thisbendingandtherespectiveeffectsofconcretecreep.Thispa-verticalalignmentandthecorrespondingdistributionofforcespertriestoclosethisgapbyproposingasimpleandpracticalÐthatis,thedeadl
