桥梁设计毕业设计(交通大学)

兰州交通大学毕业设计（论文）-1-摘要本设计为预应力混凝土连续梁桥的设计，桥式布置为420m、连续空心板梁，梁高90cm，桥面宽度12.5m；双柱式桥墩，桩基础。本设计对该桥的上部结构做了设计与检算。根据线路情况，全桥共设为4跨，有3个桥墩，两个桥台。在上部结构设计中，根据设计要求进行拟定截面尺寸，分别计算结构恒载、活载内力，并进行荷载组合，确定出主梁的最不利荷载，进行预应力钢束的估算和布置并考虑各阶段的预应力损失，最后对控制截面进行强度、应力、抗裂性和挠度检算。以上各项检算均满足相关规范要求。本次设计所选方案合理，设计方法正确，设计和检算均采用Excel列表计算，并利用AutoCAD软件绘制了全桥总体布置图、主梁构造图、预应力筋布置图及桥墩构造图。关键词：预应力；连续梁；空心板；荷载组合兰州交通大学毕业设计（论文）-2-AbstractThispaperisthedesignofthePCcontinuousbeam.whichislocatedatJiuquan,the420mspansandsimply—continuoushollowslab-beamsislaidtotheformofthebridge,theheightofthebeamis90cm,thewidthofthepavementis12.5m,thepilefoundation.Theupperrpartofthebridgearecalculatedinthisdesign,basingontheconditionoftheline,therearefourspans,threepiersandtwoabutmentsonthebridge.Thedimensionofthesectionisreferredtothedemandofthedesign,thenthestructure’sdeadload,liveloadandinternalforceiscalculated,atthesametime,theloadisassembled,sothemaingirder’smostdisadvantagedloadcanbedecided,consideringtheeachphase’sPCloosing,thePCSteelsaregenerallycalculatedandarranged.Lastly,thecontrolsection’sstrengthen,stress,crackresistance,deformationiscalculated.Allofthecalculationismetthecorrelatedcriterion.Thereasonableprogramsandpropermethodsareselectedinthisdesign,thetoolExcelisusedtothecalculationanddesign,andthepictureofthewholebridge,theconstructionaldrawingofmaingrider,thearrangementofPCsteelsgridandconstructionaldrawingofpier,theisdrewbythesoftwareAutoCAD.Keywords:PC；continuousbeam；hollowslab；combinationofload兰州交通大学毕业设计（论文）I目录第一章桥梁方案比选............................................................................................................1一背景及基本资料...............................................................................................................1二方案比选...........................................................................................................................2第二章设计资料....................................................................................................................6一桥梁横向布置...................................................................................................................6二纵横坡...............................................................................................................................6三桥下净空...........................................................................................................................6四高跨比...............................................................................................................................7五桥面铺装...........................................................................................................................7六上部结构...........................................................................................................................7第三章截面特性计算............................................................................................................9一截面特性计算...................................................................................................................9二空心板截面的抗扭惯矩.................................................................................................10三计算刚度参数.................................................................................................................10第四章作用效应计算..........................................................................................................11一结构自重作用效应计算.................................................................................................11（一）结构自重作用荷载集度的计算.........................................................................12（二）内力计算.............................................................................................................12二可变作用效应计算.........................................................................................................15（一）冲击系数计算.....................................................................................................15（二）横向分布影响线.................................................................................................16（三）计算荷载横向分布系数.....................................................................................19（四）各截面的汽车荷载效应内力计算.....................................................................20（五）温度变化次内力计算.........................................................................................21（六）基础沉降计算.....................................................................................................22三内力组合.........................................................................................................................26（一）按承载能力极限状态设计.................................................................................26（二）按正常使用极限状态设计.................................................................................27（三）内力包络图.........................................................................................................30第五章预应力钢筋的估算及布置......................................................................................32一钢束桥规估算的原理与方法.............................................................