混合梁斜拉桥成桥恒载索力优化研究

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1、华中科技大学硕士学位论文混合梁斜拉桥成桥恒载索力优化研究姓名：李孟然申请学位级别：硕士专业：桥梁与隧道工程指导教师：高荣雄20061107AbstractWiththerapiddevelopmentofthenationaleconomyandtheincreasinglyriseofthetraffic,thescaleandnumberofbridgeswithlongspanincreasedaily.Thecable-stayedbridgeisacompetitivebridgetypeofbridgeswithlongspanandsuperspanbridges.Thedist

2、ributingofinternalforceofthecable-stayedbridgeatcompletionstageisoneoftheimportantstandardstoevaluatethedesignquality.Asforbridgesatcompletionstage,thedistributingofinternalforceisdeterminedbythecabletensiontoagreatdegree.Soitisthemainpurposeofthispapertostudytheoptimizationofcabletension.Attheprese

3、nttime,therearevariousmethodstooptimizethecabletension.Theycanbesortedintooptimizationofcabletensionwithspecifiedstressstate、unconstrainedoptimizationofcabletensionandconstrainedoptimizationofcabletension.Forinstance,therearerigidsupportcontinuousbeammethod、minimalbendingenergymethod、forcebalancemet

4、hod、minimalcableusagemethodandinfluencematrixmethod.Inthepracticalapplications,youshouldselecttheappropriateoptimizationmethodaccordingtothefact.Thegirderofthehybridcable-stayedbridgeiscomposedoftwomaterialsalongthelengthdirection.Themainspanhaslargespanability.Basedonthecharacteristicsofthehybridca

5、ble-stayedbridge,thispaperbringsforwardanoptimizationmodelofcabletensionatcompletionstage.Itaimstominimizethemaximumdisplacementsofthegirderandthemainpylonofhybridcable-stayedbridge.Andittakesallowablestressofcableasarestriction.Otherwise,italsoconsiderstherestrictionofjointbendingmomentbetweensteel

6、gilderandconcretegirder.Onthebasisoftheabovemodel,thepaperappliescomplexmethodtooptimizationofcabletension.Inaddition,thebasicidea、arithmeticalongwithscopeofapplicationofsimplexmethodandcomplexmethodarestressed.Thesolvingstepsofinfluencematrixareintroducedindetail.BasedontheRonghuBridgeofWuxicity,th

7、ispaperusesfiniteelementprogramANSYStoestablishthespatialmodel,andoptimizesthecabletensionbyoptimalanalysismodulewithANSYS.InadditiontoparticularintroductionoftheANSYSoptimalIIanalysistechnique’sfunda