正交异性板扁平钢箱梁若干问题研究

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1、东南大学硕士学位论文正交异性板扁平钢箱梁若干问题研究姓名：张陕锋申请学位级别：硕士专业：结构工程指导教师：郭正兴20060325东南大学硕士学位论文StructureCharacteristiCSResearchofOrthotropicDeckFIatSteeIBoxGirdersAbstractTheSevernBridgeisthefirstbridgeintheworldtobebuiltwithaorthotropiedecksteelboxgirderofaerodynamiccross-sectionandinclinedhanger

2、s．Usingthissectionmostlyideatoreduceaerodynamicinstability．Simultaneity,orthotropicdeckprovide∞excellentsolutionforanylarge-scalestructureswhereweightisat2issue．So，thistypeofconstructionwasusedlaterforabridgeovertheBosporusatlstanbul，theLittebeltbridgeinDenmark,andtheHumberbri

3、dgeinNorthemEngland．Infact,orthotropicdecksteelboxgirdersalesuitedanybridgewhereweightorhightofgiederisanimportantjssue．Boxgirdersaresusceptibletocrosssectionaldistortionundereccentricloadingcondition．Itisimportanttoanalysistheratioofthedistortionalwarpingnormalstresst0thebend

4、ingnormalstress．Steelboxgirderisawelded,all—steelsuperstructure,weldresidualstressstronglyaffecti协fatiguelife．Anothermostchallengetodesignforfatigueistheconnectiondetailbetweenthelongitudinalribsandthediaphragmplate．Researchofperformancecharacteristicsofthisstructurewithfinite

5、elementanalysisispresentedinthisthesis．Threelevelfiniteelementmodelsofarealsteelorthotropicdeckfiatboxgirderarepresentedinthisthesis．1．The3Dshellmodelofthesteelorthotropicdeckboxgirderblockincludesdeckplate，bottomplate,ribs,diaphragmandweb．Thismodelcanconsiderthegirderbendinga

6、ndtorsionactionaswellaswarping,shearlag,andtheinteractionofstructuralelement．2．AsecondlevelmodelCanbedevelopedforconsideringweldresidualstressofUribtodeckplateandmadeupof3Dblockelement，it’Sathermal—structuresequentiallycouplefieldanalysis．Thestressspectraobtainedfromthismodelc

7、anbeusedtostudyultimatestrengthandfatiguestrengthofUriborthotropicdeck,andtopredictthelifeofthisboxgirder．3．Thethirdmodelbemainlymadeupforconsideringgeometrydetailoforthotropicdeck．Stressconcentrationnearlycutoutandstressofdeckplate,Uribsanditsdiaphragmplatearesimulated．Allthe

8、sestudiesaimtodeeplyunderstandstructurecharactersofsteelortho