40m预应力砼简支T型梁桥毕业设计

河北联合大学轻工学院09级本科毕业设计第1页共73页1目录目录................................................................................................................................1摘要..............................................................................................................................3Abstract..........................................................................................................................4第一部分、桥梁设计....................................................................................................61、水文计算.........................................................................................................61.1原始资料.................................................................................................61.2水文计算...................................................................................................62、方案比选.........................................................................................................92.1方案一、预应力混凝土简支梁桥...........................................................92.2方案二、钢筋混凝土连续箱梁桥.........................................................102.3方案三、双塔斜拉桥.............................................................................103、设计资料及构造布置...................................................................................113.1设计资料.................................................................................................113.2横截面布置..............................................................................................124、桥梁上部结构荷载计算...............................................................................144.1、行车道板内力计算...............................................................................144.2、主梁内力计算.......................................................................................154.3、主梁内力组合计算...............................................................................255、预应力钢束的计算及其布置.......................................................................265.1、跨中预应力钢束截面积估算...............................................................275.3、主梁截面几何特性计算.......................................................................325.4、持久状况截面承载力极限状态计算...................................................325.5、钢束预应力损失计算...........................................................................355.6、应力验算.............................................................................................435.7、抗裂性验算...........................................................................................455.8主梁变形（挠度）计算..........................................................................465.9、主梁端部（锚固端）的局部承压验算...............................................47河北联合大学轻工学院09级本科毕业设计第2页共73页26、桥梁下部结构计算.......................................................................................506.1、盖梁的计算...........................................................................................506.2桥墩墩柱计算.........................................................................................636.3钻孔灌注桩桩的设计计算.....................................................................67第二部分、结论........................................................................................................75第三部分、参考文献................................................................................................76第四部分、致谢........................................................................................................77河北联合大学轻工学院09级本科毕业设计第3页共73页3摘要本设计是根据设计任务书的要求和《公路桥规》的规定,对资阳市九曲河3×40m简支梁桥进行方案比选和设计的。对该桥的设计，本着“安全、经济、美观、实用”的八字原则，本论文提出三种不同的桥型方案进行比较和选择，方案一：预应力混凝土简支梁桥；方案二：悬索桥；方案三：混凝土箱梁桥。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简支梁桥（锥形锚具）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利，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、偏心压力法求出活载横向分布系数，并运用最大荷载法法进行活载的加载。进行了梁的配筋计算，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、锚固区局部强度验算和挠度的计算。下部结构采用以钻孔灌注桩为基础的双墩柱，采用盆式橡胶支座，并分别对桥墩和桩基础进行了计算和验算。本设计全部设计图纸采用计算机辅助设计绘制，计算机编档、排版，打印出图及论文。期间翻译了一篇英文短文：“Thebridgecrackproducedthereasontosimplyanalyse”。关键词：预应力混凝土、简支梁桥、钻孔灌注桩、锥形锚具河北联合大学轻工学院09级本科毕业设计第4页共73页4AbstractThisdesignisaccordingtothedesignprojectdescriptionrequestandRoadBridgegaugethestipulation,3×40msimplesupportedbeambridgetoZiyangshitocarryonthenine-bendRivertoelectwiththedesign.Forthepurposeofmakethetypeofthebridgecorrespondingwiththeambienceandcostsaving.Thispaperpresentsthreedifferentkindsofcomparisonandselectionofbridgetypealternativesfortwo-pylon,scheme1:prestressedconcretesimplysupportedgirderbridge;Scheme2:suspensionbridge;Solution3:throughtheconcreteboxgirderbridgeaswellasthedesignandconstructionaspectsoffengshuiprinciplestoconsidermoredeterminetheprestressedconcretebeambridge(taperedanchorage)astherecommendedplanInthedesign,thecalculationofbridgeupperstructurebridgeisanalyzedemphaticallyintheuseofengineeringzhonghengloadandliveloadeffect,theoverallvolumeandweightcoefficient,loadsetdegreeofinternalforceofdeadloadcalculationusingtheleverprinciplemethodofliveloadtransversedistributioncoefficientofeccentricpressuremethod,andusingthemethodofmaximumloadmethodfortheloa