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内蒙古大学本科毕业论文学校代码学号00863112分类号密级本科毕业论文（设计）9×30米装配式预应力混凝土箱型梁桥设计学院、系鄂尔多斯学院土木工程系专业名称土木工程年级2008学生姓名韩志东指导教师年月日内蒙古大学本科毕业论文装配式预应力混凝土箱型梁桥摘要：装配式箱型梁桥设计本着“安全、经济、美观、实用”的八字原则，根据设计任务书的要求和《公桥规》的规定,对Y河大桥进行方案比选和设计的。本论文提出三种不同的桥型方案进行比较和选择：方案一为预应力混凝土连续箱型梁桥，方案二为预应力混凝土简支T型梁桥，方案三为钢筋混凝土拱桥。经由以上的八字原则以及设计施工等多方面考虑、比较确定预应力混凝土连续箱型梁桥为推荐方案。在设计中，桥梁上部结构的计算着重分析了桥梁在使用工程中恒载以及活载的作用力，采用整体的体积以及自重系数，荷载集度进行恒载内力的计算。运用杠杆原理法、修正偏心压力法求出活载横向分布系数，并运用最大荷载法进行活载的加载。根据所得内力，进行了梁的预应力钢筋估算，估算了钢绞线的各种预应力损失，并进行预应力阶段和使用阶段主梁截面的强度和变形验算、挠度的计算。下部结构采用以钻孔灌注桩为基础的双柱式桥墩，并简要介绍了施工方案。关键词：预应力连续箱梁桥、内力、体系转换、预应力损失、验算、钻孔灌注桩、双柱式桥墩、预应力混凝土内蒙古大学本科毕业论文AssemblytypeprestressedconcreteboxgirderbridgeAbstract:PrefabricatedBoxBeamBridgeDesigninthesafe,economy,beautiful,practicaleight-characterprinciple,accordingtotherequirementsofthedesigntaskandthebridgeprovisions,ontheYRiverBridgeforschemeselectionanddesign.Thispaperpresentsthreedifferentbridgetypeschemecomparisonandselection:schemefortheprestressedconcretecontinuousboxgirderbridge,schemefortheprestressedconcretesimplysupportedTbeambridge,schemethreeisareinforcedconcretearchbridge.Basedonthecharacterandtheprincipleofdesignconstructionandotheraspectstoconsider,thecomparisontodeterminetheprestressedconcretecontinuousboxgirderbridgeastherecommendedscheme.Inthedesign,thebridgeupperstructurecalculationanalyzesbridgeinuseofdeadloadandliveloadforce,theoverallvolumeandweightcoefficient,loadcollectiondegreeofconstantloadinternalforcecalculation.Usingtheleverprinciplemethod,modifiedexcentralpressuremethodforliveloadtransversedistributioncoefficient,andthemaximumloadliveload.Accordingtotheinternalforceofthebeam,theprestressedsteelstrandestimation,estimationoflossofprestress,andprestressedphaseandusephaseofthemainbeamsectionofthestrengthanddeformationcalculation,thecalculationofdeflection.Thesubstructureadoptstoboredpilebasedondoublecolumnpier,andbrieflyintroducestheconstructionscheme.Keywords:prestressedcontinuousboxbeambridgeinternalforce,system,conversion,prestressloss,checking,boredpile,doublecolumnpier,prestressedconcrete内蒙古大学本科毕业论文目录总论...............................................................................................................................................................-1-1概述...................................................................................................................................................-1-1.1预应力混凝土梁桥概述.........................................................................................................-1-1.2我国预应力混凝土梁桥的发展.............................................................................................-2-第一章方案比选....................................................................................................................................-3-1具体方案比选.....................................................................................................................................-3-1.1预应力混凝土箱型梁桥方案.................................................................................................-3-1.2部分预应力混凝土斜拉桥方案.............................................................................................-3-1.3上承式刚架拱桥方案.............................................................................................................-3-2方案比选...........................................................................................................................................-4-第二章Y河水文设计原始资料及计算.......................................................................................................-5-1设计原始资料....................................................................................................................................-5-2河段类型判断....................................................................................................................................-5-2.1稳定性及变化特点.................................................................................................................-5-2.2河段平面图形.........................................................................................................................-5-2.3断面及地址特征.....................................................................................................................-5-3设计流量和设计流速的复核............................................................................................................-5-3.1根据地质纵剖面图绘出的河床桩号，绘制河流横断面图。.............................................-5-4桥孔长度计算....................................................................................................................................-8-5桥面设计高程计算............................................................................................................................-8-5.1计算桥下雍水高度'Z.........................................................................................................-9-6冲刷计算...........................................................................................................................................-9-6.1一般冲刷...........................................................................................