25米预应力简支T梁桥设计

郑州航空工业管理学院毕业论文（设计）2014届土木工程（道桥方向）专业1009052班级题目25m预应力混凝土简支T梁桥设计（中梁）姓名某某某学号1009052xx指导教师某某某职称教授二О一四年五月二十七日摘要本次设计的题目是《25m跨径预应力混凝土T型梁设计（中梁）》。根据相关技术规范要求，通过设计任务书、开题报告给出的基本数据，设计上部构造形式、横截面相应宽模度、预置高度、边梁悬臂长度、截面尺寸等本设计采用的是后张法预应力混凝土的简支T型梁桥，25mT梁的计算跨径是24.16m，梁长24.96m，主梁为变截面T型梁。路基全宽24m，半幅桥梁宽12m，两侧采用混凝土护栏宽度各0.5m，不设人行道；桥面铺装采用10cm沥青混凝土8cm水泥混凝土；车道数为双向4车道；汽车荷载是公路－Ⅰ级。上部构造形式采用6梁式；梁宽模数为B=2.0m，T梁预制高度为1.6m。具体包括以下几个部分：桥型布置，结构各部分尺寸拟定；选取计算结构简图；恒载内力计算；活载内力计算；荷载组合；预应力钢束的估算及其布置；配筋计算；预应力损失计算；截面强度验算；截面应力及变形验算；行车道板的计算。使用的工具有：“CAD”绘图软件、“MathType”数学公式编辑器、“Midas”计算软件。关键词后张法;预应力混凝土;内力计算AbstractThedesignof《abridge25mpost-tensionedprestressedconcretesimplysupportedTbeambridgestructuredesign》.Accordingtotherelevanttechnicalspecifications,throughthedesignplan,openingreportgivesthebasicdata,designtheformofsuperstructure,thecorrespondingcross-sectionwidthofModular,presetheight,beam,cantileverlength,sectionsize,etc.Thisdesignusesapost-tensionedpriestess’sconcretesimplysupportedT-beambridge,25mTcalculationsspanbeamis24.16m,beamlength24.96m,themainbeamforthevariablecross-sectionT-beam.Subgradefullwidth26m,halfofthebridgewidth12.75m,onbothsidesofthewidthoftherigidbarrier0.5m,withnosidewalks;asphaltconcretepavement8cmby10cmcementconcrete;Drivenumberoftwo-way4Drive;carloadhighway-Ⅰlevel.Superstructureformsa6beam;beamwidthmodulusB=2.0m,Tprecastbeamheight1.6m.Specificallyincludethefollowingcomponents:bridgelayout,structuraldimensionsofvariouspartsofthedevelopment;selectthecalculationstructurediagram;deadloadoftheinternalforcecalculation;LiveLoadcalculation;loadcombination;prestressedsteelbeamandthelayoutoftheestimation;reinforcementcalculation;prestresslosscalculation;strengthcalculationsection;sectionstressanddeformationofchecking;laneboardcalculations.Usethetools:CADdrawingsoftware,MathTypemathematicalformulaeditor,Midascalculationsoftware.KeyWordsPost-tensioned；priestessesconcrete,；Internalforcecalculation目录摘要...................................................................................................1Abstract.....................................................................................................21计算依据与基础资料........................................................................-1-1.1设计标准及采用规范...........................................................-1-1.1.1标准...........................................................................-1-1.1.2采用规范...................................................................-1-1.1.3参考资料...................................................................-1-1.2主要材料...............................................................................-1-1.3设计要点...............................................................................-1-2结构尺寸及截面特征.......................................................................-1-2.1T梁翼缘板有效宽度计算....................................................-2-3汽车荷载横向分布系数、冲击系数计算.......................................-3-3.1汽车荷载横向分布系数计算...............................................-3-3.1.1车道横向折减系数...................................................-3-3.1.2跨中横向分布系数...................................................-3-3.1.3支点横向分布系数：...............................................-4-3.2汽车荷载冲击系数...............................................................-5-3.2.1汽车荷载总想整体冲击系数...................................-5-3.2.2汽车荷载的局部加载的冲击系数...........................-5-4作用效应组合...................................................................................-5-4.1作用的标准值.......................................................................-5-4.1.1永久作用标准值.......................................................-5-4.1.2汽车荷载效应标准值...............................................-6-4.2作用效应组合.......................................................................-7-4.2.1基本组合...................................................................-7-4.2.2作用短期效应组合...................................................-8-4.2.3作用长期效应组合...................................................-8-4.3截面预应力钢束估算及荷载特性计算...............................-9-4.3.1全预应力混凝土受弯构件受拉区钢筋面积估算..-9-4.3.2截面几何特性计算.................................................-12-5持久状态承载能力极限状态计算.................................................-12-5.1正截面抗弯承载能力.........................................................-12-5.2斜截面抗剪承载力验算.....................................................-12-5.2.1确定斜截面抗剪计算截面的位置.........................-12-5.2.2验算受弯构件抗剪截面尺寸是否需进行抗剪强度计算.................................................................................................-14-5.2.3箍筋设置.................................................................-14-5.2.4斜截面抗剪承载力验算.........................................-15-6持久状况正常使用极限状态计算.................................................-16-6.1预应力钢束应力损失计算.................................................-16-6.1.1张拉控制应力.........................................................-16-6.1.2各项预应力损失.....................................................-16-6.2温度梯度截面上的应力计算.............................................-20-6.3抗裂验算...............................