50m预应力混凝土连续梁桥毕业设计

1摘要本论文主要是进行预应力混凝土连续箱型梁桥上部结构设计。预应力混凝土连续梁桥具有变形小、行车稳定舒适、结构受力性能好、后期维护量小、抗震能力强等优点成为现代桥梁的主要组成之一。本论文设计分为主桥和引桥的设计，在方案比选阶段，主桥只涉及到了主要的尺寸拟定及平、纵、横断面图的绘制，不做计算。引桥为本论文的核心。引桥为50+70+50m的预应力混凝土连续箱型梁桥，分为单幅设计，单箱双室，桥面宽13m，为3车道，设计荷载标准为公路一级。设计过程如下：尺寸拟定、利用桥博建模、恒载计算、次内力计算、预应力钢筋的估算、内力组合、、预应力损失计算、主梁验算、挠度与预拱度的设置、主要工程数量的汇总。关键词：预应力混凝土连续梁桥恒载次内力内力组合桥梁博士主梁验算地震AbstractThisdissertationismainlyonsuperstructuredesignofprestressedconcretecontinuousboxgirderbridge.Theprestressedconcretecontinuousbeambridgehastheadvantagesofsmalldeformation、stabledrivingcomfort、goodmechanicalpropertiesofthestructure、smallamountofmaintenance、strongseismicabilityandsoon,whichbecomeoneofthemaincomponentsofmodernbridge.Thisdissertationisdividedintothedesignofthemainbridgeandthebridgeapproach.Duringcomparisonandselectionphaseoftheprogram,themainbridgeinvolvesonlythemaindimensionsformulateandflat、vertical、cross-sectionaldrawing,withoutbeingcalculated.Theapproachbridgeisthecoreofthisdissertation.Theapproachbridgeisaprestressedconcretecontinuousboxgirderbridge(structuresize:50+70+50m),whichisdividedintoasingledesign,singleboxanddoubleroom.Otherindicators:bridgedeckwidthof13m、3lanes,designloadstandardforhighway1.Thedesignprocessisasfollows:Sizeformulation、modelingbyusingDr.bridgesoftware、thecalculationofdeadload、thecalculationofsecondaryinternalforce、estimationofprestressedreinforcement、thecombinationofinternalforces、thecalculationoftheprestressedloss、girderchecking、deflectionandcambersetting、thesummaryofmajorengineeringquantity.Keywords:prestressedconcretecontinuousbeambridge;deadload、secondaryinternalforce；thecombinationofinternalforces；Dr.BridgesSoftware;beamcalculation；earthquake50m+70m+50m预应力混凝土连续箱型梁桥设计I目录1绪论.................................................................11.1预应力混凝土连续箱型梁桥的概述..................................11.2选题的意义......................................................22设计资料.............................................................32.1工程概况........................................................32.2主要材料及要求..................................................43桥跨总体布置及结构尺寸拟定...........................................63.1尺寸拟定........................................................63.1.1桥孔分跨..................................................63.1.2截面形式..................................................63.1.3梁高......................................................73.1.4细部尺寸..................................................74主梁建模............................................................104.1主梁分段与施工阶段划分.........................................104.1.1分段原则.................................................104.1.2具体分段.................................................104.1.3主梁施工方法及注意事项...................................115恒载计算............................................................145.1主梁内力计算...................................................145.1.2恒载计算.................................................165.2.活载因子的计算................................................175.3活载内力计算...................................................185.4单元影响线计算.................................................196次内力计算..........................................................236.1预加力引起的次内力.............................................236.2收缩徐变引起的次内力...........................................246.3温度次内力的计算..............................................256.4支座沉降次内力的计算...........................................277预应力钢束的估算与布置..............................................32西南石油大学本科毕业设计II7.1预应力束筋的估算................................................327.1.1计算原理..................................................327.1.2钢束估算..................................................357.2预应力束筋的布置................................................368预应力损失及有效应力计算.............................................398.1预应力损失的计算...............................................398.1.1摩阻损失..................................................398.1.2.锚具变形损失..............................................408.1.3.混凝土的弹性压缩..........................................408.1.4.钢束松弛损失..............................................408.1.5.收缩徐变损失..............................................419内力组合.............................................................439.1承载能力极限状态下的效应组合..................................439.2正常使用极限状态下的效应组合..................................4510主梁验算............................................................4810.1持久状况承载能力极限状态验算...................................4810.1.1正截面承载力计算.........................................4810.2持久状况正常使用极限状态应力验算..............................5010.2.1正截面验算（法向拉应力）.................................5110.2.2混凝土的主压应力验算.....................................5411挠度与预拱度设计....................................................5512主要工程数量计算....................................................5612.1混凝土总用量计算..............................................5612.1.1梁体混凝土计算...........................................5712.1.2桥面铺装层混凝土计算.....................................5712.1.3防撞墙栏杆计算...........................................5712.2钢