年毕业设计-4×35m-预应力钢筋混凝土连续箱梁桥资料

2014年毕业设计4×35m预应力钢筋混凝土连续箱梁桥山东交通学院毕业设计摘要本次毕业设计的题目是4?35m的连续箱梁桥设计。依据《公路桥涵通用设计规范JTGD60—2004》、《公路钢筋混凝土及预应力混凝土桥涵设计规范JTGD62—2004》，通过综合运用所学过的基础理论及专业知识。独立进行桥梁设计。首先，根据地形图提出三种桥型比较方案，然后从外观、施工难易程度和造价等多方面考虑，最终选出最优方案。其次，对桥梁的上部结构进行设计计算，包括桥跨布置及结构尺寸、主梁作用效应计算、预应力钢束的估算及布置以及上部结构的验算，通过计算，强度验算、抗裂验算以及持久和短暂状况的验算全部通过。最后，对桥梁的下部结构进行设计计算，设计采用单排双柱式桥墩和钻孔灌注桩基础。下部结构的设计和计算包括墩柱的设计与计算，桩基的设计与计算。关键词：预应力混凝土，等截面连续箱梁桥，整体现浇，结构设计，结构验算1AbstractThetitleofthisgraduationdesignisthedesignofacontinuousbridgewiththespanof4?35mmeters.Accordingto《TheCommonSpecificationofHighwayBridgeandCulvertJTGD60-2004》and《SpecificationsforDesignofReinforcedConcreteandPrestressedConcreteHighwayBridgesandCulvertsJTGD62-2004》，wehavetodesignthebridgeindependentlywiththeuseoftheknowledgeofbasictheoryandprofessionlesson.Thefirststepistogivethreetypesofthebridgeaccordingtotopographicmap.Thenaccordingtothecomparisonfromtheappearance,thedegreeofconstructiondifficultiesandconstructioncostandsoon,wechoosethebestsuitabletype.Thesecondstepistodesignandcalculatetheupsidestructure,whichincludesthearrangementofbridgespansandstructuredimensions,thecalculationontheeffectofmaingirder,theestimationandlayoutofprestressedsteelandthecheckingofupsidestructure.Thelaststepistodesignandcalculatelowerpartstructure.Thedesignemploydoublecolumnpierandboredpilesfoundation.Thecalculationanddesignoflowerpartstructureincludespierandpilefoundation.Keywords：Continuousbeambridge,uniform-sectioncontinuousboxgirderbridge,thewholecast,structuraldesign,structurechecking2山东交通学院毕业设计目录1前言...................................................................12方案比选................................................................42．1原始资料.........................................................42.1.1地质条件.....................................................42.1.2设计要求.....................................................42.1.3设计原则.....................................................42.2方案比选.......................................................42.2.1第一方案：装配式预应力混凝土简支箱梁桥.......................42.2.2第二方案：连续梁刚构桥.......................................52.2.3第三方案：等截面连续梁桥.....................................52.2.4方案比选.....................................................63桥跨布置及结构尺寸......................................................73.1桥跨布置..........................................................73.1.1设计资料.....................................................73.1.2设计荷载.....................................................73.1.3材料及工艺...................................................73.1.4设计依据.....................................................73.2构造布置..........................................................73.2.1主梁尺寸拟定.................................................73.2.2横截面沿跨长改变.............................................93.2.3主梁毛截面几何特性计算.......................................94主梁作用效应计算.......................................................104.1结构自重荷载计算.................................................104.2结构自重作用效应计算.............................................104.2.1一期自重作用效应计算........................................104.2.2二期自重作用效应计算........................................114.2.3自重作用效应汇总............................................114.3汽车荷载作用效应计算.............................................124.3.1冲击系数和折减系数..........................................124.3.2汽车荷载横向分布影响的增大系数计算..........................134.3.3汽车活载效应计算............................................154.4温差应力及基础沉降内力计算.......................................1934.4.1温差应力计算................................................194.4.2基础沉降计算................................................214.5内力组合.........................................................254.5.1按承载能力极限状态设计......................................264.5.2按正常使用极限状态设计......................................274.5.3计算结果....................................................285预应力钢束的估算及布置.................................................345.1钢束估算按构件——正截面抗裂性要求估算预应力钢筋数量.............345.1.1估算跨中截面下缘所需预应力钢筋............................345.1.2估算跨中截面上缘所需预应力钢筋............................355.1.3估算结果...................................................355.2钢束布置.........................................................355.2.1钢束布置构造要求............................................355.2.2钢束布置原则................................................366预应力损失及有效预应力计算.............................................406.1基本理论.........................................................406.2预应力损失计算...................................................406.2.1预应力钢筋与管道之间摩擦引起的应力损失?l1...................406.2.2后张法锚具变形、钢筋回缩和接缝压缩引起的应力损失6.2.3后张法由混凝土弹性压缩引起的应力损失?l2.........40?l4.....................416.2.4后张法由钢筋松弛引起的预应力损失终极值?l5...................426.2.5后张法由混凝土收缩、徐变引起的预应力损失?l6.................426.2.6截面预应力损失合计和有效预应力..............................437强度验算...............................................................447.1基本理论.........................................................447.2计算公式.........................................................448抗裂验算...............................................