多跨長聯(lián)預(yù)應(yīng)力混凝土連續(xù)梁橋合龍技術(shù)研究.pdf

1、東南大學(xué)碩士學(xué)位論文多跨長聯(lián)預(yù)應(yīng)力混凝土連續(xù)梁橋合龍技術(shù)研究姓名：肖星星申請學(xué)位級別：碩士專業(yè)：橋梁與隧道工程指導(dǎo)教師：虞建成20070101AbstractThemultispancontinuousprestressedconcretebeambridgehasmanyadvantagessuch∞fewerexpandedoints，correspondingconducivetohigh—speedtraffic，andlowe

2、rcostincomparisonwithotherbddgesWiththeincreasingnumberofspanandthelongerunitmanyproblemsappear，suchasclosureconstructiontechnology，thetemperatureeriectonthemulti—spanbridgebearingsiointdisplacement，deformationofthebeame

3、nd，theprestressedsecondaryaxialloadproblembyclosurebundleandsoonSothispaperstudiestheseproblemsinthebackgroundoftheprojectoftheWolonglakebridgeForclosureeonsUqactiontechnologythemidsectionstressofbeamStressofthetopsectio

4、nofthepieranddeformationofbeamforvariousclosureplansinthecompletionstateiscalculatedTheeffectofthesecondaryforcesofprestressconcretecreepandshrinkageisanalyzedforthebeaminthevariousWolonglakebridgeclosureplans；Witllcompa

5、ringtheconstructionequipmentandconstructiondateoftheclosureplansitisinducedtIlattheadvantagesanddisadvantagesfieldofapplicationandmattersneedingattentionofthevariousclosureplansThispaperintroducesthebasicprinciplesofthet

6、emporaryrestrictedlockingdesignofmalti—spanlongunitebridgeanalyzessomeproblemsindeteilintheconstructionpracticeoftheWolonglakebridge(suchastheplanselectionoftherightrangeconstructionclosureetc)，andthenpresentstheResultso

7、fbridgeconstructioncontrolattheend0fmispapernleeffectsoftemperatureonthedisplacementofthelongmulti—spanbddgebearingstheeformationofthebeamendUndercertainassumptionsthePaperderivedthetheoreticalcalculationformulaofthedisp

8、lacementoftbelongmultispanbridgebearingwhichiscausedbytemperature；Undertheforecasttemperature，theseincludingthedisplacementofthepiersupports，theexpansivevalueofthebeamendarecalculatedtoiustructthesetupoftheexpansionioint

9、servedwidthandthesetupofthesupporteccentricityaftertheentirebddgeclosureofthewlonglakebridge；Bycomparati：elyanalyzingbearingdisplacementofvariousplansofthebridgejosurecausedbytempcraturesometechnicalmeasuresofreducingthe

10、displacementareroposedThesecondaryaxialforoeproblemcausedbyclosurebundlesnIroughanalyzingthechangeofthefrictionalresistanceofbearingsintheprocessofconstructionandtensioningclosurebundlesthetheoreticalcalculationformulaof

11、thesecofldaryaxialforcecausedbythemidspanclosurebundlesisdedvadandthemainaffectingfactorofthesecondaryaxialforceisgaveTheratiobetweenthemomentcausedbythefrictionofbearingsandthedeadweightoftbeboxgirderisacquiredforaunifo

12、rmsection4spancontinuousgirderbridge；Wt11consideringthesecondaryaxisforcecausedbyclosurebundles，theformulasaboutbearingcapacityofcross—section，crackingofcroassectionanddiagonalcrackingareproposed；Anditcalculatesthesecond

13、aryaxisforcccausedbyclosurebundlesofspansThestressofthecontrolsectioniscalculatedduringthephaseofconstruction，runningundermostdisadvantageofthegirdercausedbyfrictionalresistanceofbearings；Intheend，thispaperproposessomete

14、chnicalmeasuresofreducingpresecondaryaxialforcetoprovideSomeusefulsuggestionsandrecommendationsforthefutureConstructionofmultispanprestressedconcretecontinuousbeambridgesKeywords：longmultispanbddge；planofclosure；lockingo