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本科毕业设计3×30m连续刚构桥设计Designof3×30mContinuousRigid-FrameBridge学院：专业：学生姓名：学号：指导教师：2020年2月学士论文版权使用授权书本学士论文作者完全了解北京交通大学有关保留、使用学士论文的规定。特授权北京交通大学可以将学士论文的全部或部分内容编入有关数据库进行检索，提供阅览服务，并采用影印、缩印或扫描等复制手段保存、汇编以供查阅和借阅。（保密的学位论文在解密后适用本授权说明）学位论文作者签名：指导教师签名：签字日期：年月日签字日期：年月日北京交通大学毕业设计（论文）中文摘要i中文摘要摘要：连续刚构的结构特点是将连续梁的桥墩与梁部固结,从而减小支座处的负弯矩和增强结构的整体性。由于桥墩一般属于小偏压构件,故与连续梁结构的桥墩相比配筋不会增加很多,而梁体受力则更为合理,因而在同等条件下连续刚构要比连续梁在经济性上更为合理。此外,墩梁固结在一定程度上避免了大吨位支座设计与制造的困难。本课设以茅以升公益桥项目为背景，完成3×30m连续刚构设计。主要研究内容包括：(1)通过参考国内外城市公路规范及类似跨度桥梁设计方案，初步拟定所研究和设计的刚构桥的主梁截面尺寸。(2)应用桥梁有限元分析软件MIDAS建立素混凝土桥梁模型，进行荷载组合并对其进行内力分析。根据分析结果估算各截面所需预应力钢筋的数目，同时结合一定的工程实际,对其进行初步布置。(3)应用MIDAS软件按悬臂法施工步骤建立包含预应力钢束的施工阶段桥梁模型，对各阶段进行强度检算，调试通过后得到最终合拢后的桥梁模型。(4)依据设计规范对主梁关键截面进行强度检算和抗裂性检算，并绘制相关图纸。关键词：城市公路；预应力混凝土刚构桥；MIDAS；配筋计算北京交通大学毕业设计（论文）英文摘要iiABSTRACTABSTRACT:Continuousrigidframeisacontinuousbeamwithbridgepierandgirderconsolidatedtogether,toreducethenegativebendingmomentofthesupportandstrengthentheintegrityofthestructure.Duetothebridgepierisasmalleccentriccompressionmember,therefore,comparedwithcontinuousbeambridgepierreinforcementdoesnotincreasealot,andthebeambodystressismorereasonable,thusunderthesameconditionsofcontinuousrigidframecontinuousbeamismorethantheeconomy.Inaddition,thepiergirderconsolidationisalsotoacertainextent,overcomethedifficultiesoflargetonnagebearingdesignandmanufacture,alsosavespierbeamintheprocessofcontinuousbeamconstructiontemporaryrigidfixity,meetingagainafteradjustingtheconstructionprocessThissubjectsetbytheMaoYishenPublic-benefitbridgeasthebackground,completes3x30mcontinuousrigidframedesign.Themainresearchcontentsinclude:(1)byreferencetodesignofurbanhighwaybridgesspecificationandbridgesofsimilarspanathomeandabroad,theresearchofprestressedconcretecontinuousgirderbridgeofgirdercrosssectionsizeisproposed.(2)theapplicationofbridgefiniteelementanalysissoftwareMIDASplainconcretebridgemodelisestablished,theloadcombinationandcarriesontheinternalforceanalysis.Accordingtotheanalysisresultstoestimatethecrosssectionrequiredthenumberofprestressedreinforcement,andcarriesonthepreliminarylayout.(3)theapplicationofMIDASsoftwareaccordingtothemethodofcantileverconstructionstepsincludeconstructionoftheprestressedsteelbeambridgemodelisestablished,theintensityischecked,foreachphasetobefinallyclosedafterdebuggingthroughthebridgemodel.(4)accordingtothedesignspecificationsofmaingirderstrengthandcrackresistanceischeckedonthekeysectionischecked,anddrawtherelevantdrawings.Keywords:highspeedrailway;Prestressedconcretecontinuousgirderbridge;Thecantilevermethod;MIDAS.ReinforcementcalculationKEYWORDS：urbanhighwaybridge;continuousrigidframebridge;thecantilevermethod;MIDAS;reinforcementcalculation北京交通大学毕业设计（论文）目录iii目录中文摘要...........................................................................................................................IABSTRACT.........................................................................................................................II目录.........................................................................................................................III1引言.............................................................................................................................12设计基本资料...............................................................................................................32.1工程概况............................................................32.1.1主要技术指标....................................................32.1.2材料规格........................................................32.2设计标准和规范......................................................33方案比选......................................................................................................................43.1桥型方案拟定........................................................43.2连续刚构桥方案......................................................53.3连续梁桥方案........................................................63.4梁拱组合体系桥方案..................................................63.5方案比较和最优方案确定..............................................74结构尺寸拟定.............................................................................................................104.1截面形式...........................................................104.2主梁截面高度.......................................................104.3箱梁截面细部尺寸...................................................104.3.1箱梁腹板厚度...................................................104.3.2箱梁底板厚度...................................................114.3.3箱梁顶板厚度...................................................115MIDAS模型建立及主梁内力分析................................................................................135.1模型建立...........................................................135.1.1划分节点和单元.................................................135.1.2定义材料和截面特性.............................................145.1.3定义边界条件...................................................155.2荷载定义与添加.....................................................165.2.1结构自重、二期恒载.............................................165.2.2整体升降