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1、华东交通大学硕士学位论文大跨径梁桥跨中挠度控制措施研究姓名：戴玉明申请学位级别：硕士专业：结构工程指导教师：徐海燕;上官兴20080418AbstractLONG-SPANBEAMBRIDGE-CONTROLMEASURESONTHEDEFLECTIONABSTRACTAtpresent,inourcountry,mainproblemsoflargespanpre-stressedconcretegirderbridgesareexcessivemid-spanlagandcracksinboxgirde
2、r.So,itisquitenecessarytostudyhowtocontrollong-termdeflectionoflargespanpre-stressedconcretegirderbridges.Inthispaper,beginwithanalyzingthecausesoflong-termdeflectionoflargespanpre-stressedconcretegirderbridges,onthebaseofanalysis,extractingsomeeffectiveme
3、thodsthatcontrollong-termdeflectionoflargespanpre-stressedconcretegirderbridgesbythenewdesignconceptofdeadloadzerodeflection.Duringthesemethods,changedthebeamdepthandaddedtheinterringobliguefuniculustohelpclosureareemphasis,theyaredetailyanalysedinthispape
4、r.Bytheeffectivemethodsthatareextractedinthenewdesignconceptofdeadloadzerodeflectiontoanalystheinfluenceofthatmethodstoapplyaproject.First,analysisthecauseoflong-termdeflectionoflargespanpre-stressedconcretegirderbridge,extractethenewdesignconceptofdeadloa
5、dzerodeflection,accordingtothesynthesisofthenewdesignconceptofdeadloadzerodeflectionandthecauseofthelong-termdeflectionoflargespanpre-stressedconcretegirderbridges,extractesomeeffectivemethodsthatcontrollong-termdeflectionoflargespanpre-stressedconcretegir
6、derbridgesfordifferentcausesthatcausethedeflectionoflongspanbridges.Second,analyingtheinfluenceofthemiddeflectionbychangingthebeamdepth,inordertoseektheproperbeamdepthandthepropersite,taketheresultsthatchangedthebeamdepthcontrasttooriginaldesignresults.Thi
7、rd,usingtemporarycablestogetherwithdesigningpre-stressaccordingtointegralcastconstructiontocontrollong-termmid-spandeflectionisstudied.Longitudinalpre-stressedtendonsaredesignedaccordingtointernalforceofintegralcastconstruction,sumofpre-stressedbendingmome
8、nt,selfweightbendingmomentandbridgedeckpavementbendingmomentisapproximatelyzero.Duringconstructionstage,withthehelpoftemporarycables,boxgirderwillnotdeflect,sothatdisplacementduringconstructionisverylittle.Af
