大跨度连续箱梁桥底板崩裂仿真分析

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1、西南交通大学硕士研究生学位论文第1I页皇曼曼曼!i,,i．iu曼量曼曼量曼曼曼曼曼曼鼍曼璺ABSTRACTh1recentyears，谢mtherapidincreasesintrafficdemandinChina,prestressedconcretecontinuousboxgirderbridge，、)l，i也itssuperiorperformancehasbeenwidelyusedinChinabridge．However,intheconstructionoroperationoftheprocess，aconsiderabl

2、enumberofboxgirdervariousformsofcrackshaveappearedintheroof，theweb，thebottomandotherparts，especiallybottomcracking，whichbecomeanimportantfactortohinderitsdevelopment,whichalsocausedtheengineeringandacademicattention．Thesecrackshaveaverynegativeimpactonthedurability,practica

3、lityandsafetyofthestructure．ThisarticlereliesontheGuangxiadouble-trackrailwaybridge，usingthefiniteelementprogramoftheprestressedconcretebottomcrackingofcontinuousboxgirderbridgeisanalyzedandverified．Inthisthesis，theresearchworkincludes：(1)Onthebasisofalotofreadingliterature

4、，madeapresentationathomeandabroadprestressedconcretecontinuousbeamoverviewofthedevelopmentandthebottomslabcrackresearch，emphaticallyanalysestheformationreasonsandcountermeasuresofbottomcrack．(2)Inthisthesis，thefiniteelementanalysisofboxgirdertheoryispresented，andthecontento

5、fthethesisistoGuangxiadouble-trackrailwaybridgebottomcrackingproject,accordingtotheon-siteobservationsshowedthatbottomprestressedpipefloatingisthemainreasonfortheaccident．Throughtheestablishmentoftheoverallbridgemodel，thestrengthandstiffnessarecalculated．Andthencreatealocal

6、spacemodel，throughseveralconditionsofbottomstressanalysisandcomparison,verifytherightofbottomprestressedpipefloatingphenomenoncausedcoincidewiththeaccident．Finally，thisthesisgivesafewpreventionadviceandreinforcementmeasuresonboRomcracking．KEYWORDS：PrestressedConcreteContinu

7、ousBox；FiniteElementAnalysis；Prestressedpipefloating；BottomCrack西南交通大学硕士研究生学位论文第1II页目录第一章绪论⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．11．1问题的提出及研究的意义⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯。l1．2预应力连续箱梁桥的结构特点⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯11．3预应力混凝土连续箱梁桥底板崩裂问题研究现状⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯21．4．本论文研究的主要内容⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯

8、⋯⋯⋯．2第二章连续箱梁桥底板崩裂原因分析及对策⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯32．1连续箱梁桥底板崩裂状况分析⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．3