大跨度连续刚构桥跨中下挠问题原因及对策研究

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1、西南交通大学硕士学位论文大跨度连续刚构桥跨中下挠问题原因及对策研究姓名：罗春林申请学位级别：硕士专业：桥梁与隧道工程指导教师：赵雷20081120西南交通大学硕士研究生学位论文第lI页●I⋯——_Il——_I__————一AbstractPathologiesofdefectioninbridge’Sspancentreandthecrickintheboxbeamoflongspancontinuousrigidbridgearefoundduringtheperiodofservice，this

2、problemtroublesthebridgeengineeringcirclesallthetimetillnOW．There’reseveralreasonsmaycausetheproblem：theinaccurateestimationoftheconcrete’Sshrinkageandcreep，theestimationoftheprestresslossofprestressedlongcablesisnotenough,theunfavorablestrainedconditi

3、oncausedbypoorconstructionetc．Multi·aspectanalyseofthisproblemisconductedtofoundoutthemajorcausesofthisproblem．Firstly，thecauseofthelong—spancontinousrigidbridge’spathologiesaleanalysedfromthisaspect：theshrinkageandcreepofconcrete，lossofprestress,surch

4、argeofmobileloadandthefactoroftemperature．Secondly,theFEMmodelofapracticeprojectofcontinousrigidbridgewithamainspanof190metresissetupbYMidas／civiltoanalysethesensitivityofdefectioninspancentreofthisaspect：lossoflongitudinalprestress，thecomputationmodul

5、eofshrinkageandcreepofconcrete，theprestressloadingageofconcreteandsurchargeofmobileload．Aconclusionisdrawedthattheeffectofthelossprestressespeciallylongitudinaltopslabprestressismostremarkable，theshrinkageandcreepofconcreteandthesurchargeofmobileloadal

6、soareveryimportantcause．TheFEMmodelofthetotalbridgeissetupbyDr．bridgetoanalysetheinfluenceoflossoflongitudinalandverticalprestresscausethecrickintheboxbeam．Aconclusionis&awedthattheeffectofthelossofverticalprestresscausethecrickintheboxbeamisremarkable

7、．Finally,bysynthesesingtheresearchproductionsandsummarizeingtheexperiencesoftheexistinglong—spancontinousrigidbridges，someimproveddesignmeasures，computationmeasures，constructionmeasuresandcorrelativemeasurestocontrolthepathologiesalebroughtforward．Keyw

8、ords：continuousrigidbridge；defection；crick；lossofprestress西南交通大学学位论文创新性声明本人郑重声明：所呈交的学位论文，是在导师指导下独立进行研究工作所得的成果。除文中已经注明引用的内容外，本论文不包含任何其他个人或集体已经发表或撰写过的研究成果。对本文的研究做出贡献的个人和集体，均已在文中作了明确的说明。本人完全意识到本声明的法律结果由本人承担。方神鬈西南交通大学学位论文版权使用授权书本学位论文作者完全了解学