2003 Optimization of Cable Tensioning in Cable-Stayed Bridges

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1、OptimizationofCableTensioninginCable-StayedBridges123D.Janjic;M.Pircher;andH.PircherAbstract:Duringthestructuralanalysisofcable-stayedbridges,somespeci®cproblemsarisethatarenotcommoninothertypesofbridges.Oneoftheseproblemisthederivationofanoptimalsequenceforthetensioningof

2、thestaycables.Thispaperdescribesanovelsolutiontothisproblem,theunitforcemethod.Themethodtakesintoaccountallrelevanteffectsforthedesignofcable-stayedbridges,includingconstructionsequence,second-ordertheory,largedisplacements,cablesagandtime-dependenteffects,suchascreepandsh

3、rinkageorrelaxationofprestressingtendons.Informationabouttheimplementationofthismethodintoacomputerprogramisgiven,andanexampleofapracticalapplicationofthismethodconcludesthispaper.Themethodisnotrestrictedtothedesignofcable-stayedbridgesandmaywellbeusedforotherstructuralapp

4、licationsinthefuture.DOI:10.1061/~ASCE!1084-0702~2003!8:3~131!CEDatabasesubjectheadings:Bridges,Cable-Stayed;Optimization;Tension.Introductionstayedbridgeswherethehighnumberofcablesallowsformoreslendermaingirdersthatrequireless¯exuralstiffness.Whilesteelwasthedominatingstr

5、ucturalmaterialinthe®rstGermanHistoricalReviewcable-stayedbridges,prestressedandcompositedeckshavein-Theideaofsupportingabeamwithanumberofinclinedtensioncreasinglybeenusedinmorerecentprojects.LeonhardtandZell-membersandachievingamorefavorabledistributionofbendingner~1972!c

6、omparedvariousbridgesystemsforlarge-spanmomentsinthebeamcanbetracedbackintoancienthistorybridgesandconcludedthatcable-stayedbridgesgenerallyofferedwherestayropeswereusedtosupportcrossbeamsonEgyptiantechnicallyandeconomicallysuperiorsolutions.Manycable-sailingboats~Leonhard

7、tandZellner1991!.Arguablythe®rststayedbridgeshavenowbeenbuiltusingincreasinglyslendersuccessfulapplicationofthisconceptintheareaofbridgedesigngirderswithlargerandlargerspans.Currently,planningisunderwasrealizedbythegreatJohnA.Roeblinginarailwaysuspen-waytodesignthe®rstcabl

8、e-stayedbridgespanningover1,000msionbridgenearNiagaraFallsin1851±1855.Afterthis®rst~3,280