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1、AbstractCable-trussbridgeisanewtypeofbridgewhichbelongstothetension-tensionmechanicalsystem.Comparedwithtraditionalsuspensionbridges,thistypeofbridgeincludesmoredesignparameters,anditsstructurewillbemorecomplex.Thecurrenttheoreticalresearchonthistypeofbridgehasjuststarted,thereisnomaturational
2、theoryforthedesignandcomputationonthistypeofbridge.Inthisthesis,thecable-trussfootbridgeinrow-lakehasbeenusedastheengineeringbackground・Themechanicalpropertiesofthisfootbridgehavebeenanalyzedandthestructuralparametershavebeenoptimized.Themaincontentsandconclusionsareasfollows:1.Intheengineerin
3、gprojectofthecable-trussfootbridgeinrow-lake,thesagofthetopcable,thesagoftheundercable,thesectiondiameterofthetopcable,thesectiondiameteroftheundercable,theirinitialcableforces,thesectionaldimensionofthetowerhavebeentreatedasthedesignvariablestocreatetheparametricfiniteelementmodel.Withthismod
4、el,themethodofcreatingthefiniteelementmodelusingbyANSYSsoftwarehasbeenexplored.2.Basedontheparabolictheoryofcable,amethodtoanalyzethecompletionstateofthecable-trussbridgehasbeenproposed・Then,themethodbycomparingtheresultsofthefiniteelementmodelhasbeenverified・Astheresult,thecompletionstatewhic
5、hisdeterminedbythemethodsatisfiedtheconditionoftheinitialequilibriumstateandtherequirementoftheconvergenceforgeometricalnonlinearity.Thisshowsthatthemethodtoanalyzethecompletionstateofthecable-trussbridgeisreasonable.3.Basedonthemethodtoanalyzethecompletionstateofthecable-trussbridge,theoptimi
6、zingandanalyzingmodelofthecable-trussbridgehasbeencreated・Firstly,therangeofsevenoptimizationvariableshasbeendetermined.Then,accordingtothecharacteristicsofthecable-trussbridge,theconstraintsonthestateparametershasbeenproposed・Finally,twoobjectivefunctionswhichincludeeconomyandstiffnesscontrol
7、havebeenproposed・Withtheoptimizationmodel,themaincablesystemhasbeenoptimaldesignedfromthreerespects:stiffness,singlevariableandeconomy.Then,theeconomicoptimizationofwholetruss-cablebridgehasbeenfinished.Accordingtotheresultofexampleanal
