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1、重慶交通大學碩士學位論文連續(xù)剛構橋箱梁腹板裂縫成因分析研究姓名：潘鋒申請學位級別：碩士專業(yè)：結構工程指導教師：肖光宏20090401AbstractWithcontinuousprogressofthelevelofbridgematerialsandconstructiontechnology,continuousrigidframebridgestructurebecomesthefirstchoiceofmanybridgesbecauseofitshi【ghstructurequality．However,afterthecontinuousboxgirderbr
2、idge’Smassiveuses，theprevalenceofbox-girderwebcracksbecomestheoutstandingobstacletotheirdevelopmentandhasbecomeafocusofconcerninengineeringacademic．Inordertoinvestigatethecausesofcracksintheweb，thisarticletakingGuangYangdaobridgerealityengineeringprojectasabacking，hasconductedthesystemica
3、nalysisandresearchtotheCcontinuousrigidframebridge’Sboxgirderwebplate’Sstressconditionandthedisplacement．Thisarticle，basedonanalysisoftheliteratureofChina'scontinuousrigidframebridgecracking，particularlyinthegeneralboxgirderwebcrackingphenomenonandthereasonsforcracking，notedthedeficiencie
4、softhecontinuousrigidframebridgeinthedesignandconstruction．Andthenthroughspacefiniteelementmethod，thearticlehasanalysedtheentireboxgirderbridgeandparticularlystressstateoftheweb．Inthespacefiniteelementanalysisoflocalstressofthecontinuousboxgirderweb，thearticlegivefullconsiderationtovariou
5、sfactorsonthelocalmodeloftheboxgirderandconductthemechanicalanalysisoftheweb，especiallyfocusedonthelossofverticalprestressandTemperaturegradientchangesintheboxgirderwebcracking．Atthesametime，thearticlehasconducton-siteinvestigationofstressstateofkeypiecesintheactualstructureofthebox—girde
6、rbridgeweb，inordertotestthefiniteelementanalysismodel’Sreliabilityandaccuracy．Inthisarticle，theresultsofanalysisshowthatthemainreasonwhythiscontinuousrigidframebridgewebcracksformedis：whentheconcreteblockbeginstocontract，thecrackingblockisaffectedbythebindingeffectoftheformerblockandthetw
7、oblockagedifferenceledtotheadditionalrestrictionwhichproducethepullstress；thedifferencesinabsorptionofheatintheatmosphereoftwopiecesofblocksproduceexpandingandcrackingstressonthecrackingblock，whichiscalledthecontractionandboundarystressandabsorptionheatdifferencestr
