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1、学号： 2011 届本科生毕业论文（设计）题 目： 咸旬高速泾河大桥结构设计 学院(系)： 水利与建筑工程学院专业年级： 土木111 学生姓名： 指导教师： 合作指导教师：完成日期： 2015.5.31 中国 陕西 杨凌咸旬高速泾河大桥结构设计学生: 专业班级: 土木 111 指导教师：摘 要：预应力混凝土连续箱梁桥结构刚度大，动力性能好，而且主梁变形挠曲线平缓，有利于高速行车，连续梁在活载作用下时，因主梁连续会产生支点负弯矩，对跨中正弯矩也会有卸载作用，其弯矩分布较合理。现阶段在公路桥梁工程中应用非常广泛。通过得到的数据，本设计首先根据桥址处原始资料以及道路等级进行桥型方案设计，我决定采用了
2、连续小箱梁桥、 梁拱桥、变截面连续梁桥等三个方案进行桥型方案的比选，继而本着结构受力合力、安全舒适、经济美观 的原则，最终选择连续小箱梁桥作为推荐方案。我推荐方案采用简支转连续的施工方法，首先预制主梁后吊装施工成连续梁，在主梁上采用等高度变截面的箱形梁，我打算跨径设计为 30 米。主桥分六等跨，引桥分四等跨，全长 260 米。在此次设计计算中，我首先拟定主要构件的截面尺寸；继而计算主梁截面的几何特征值和控制截面的设计内力及其在承载能力极限状态下相应的内力组合值；接下来进行配筋计算，我的方案是采用后张法预应力钢束施工的施工工艺，接着估算预应力钢束的数量并对其进行布置。然后根据规范要求，进而进行预
3、应力损失的计算得到有效预应力值。在最后，将按照正常使用极限状态进行截面强度验算和应力验算；经过验算结果表明，该桥强度、应力等均满足规范限值要求，全桥结构和安全可靠。关键词：预应力；连续箱梁；方案比选XIAN XUN HIGHSPEED JING HE RIVER BRIDGE STRUCTURE DESIGNStudent:Ma Liang Professional Grade: Civil 111 Instructor:Zhang PengAbstract: prestressed concrete continuous box girder bridge structure stiffne
4、ss, dynamic performance good and deformation of main beam deflection curve is gentle, is conducive to high speed driving, continuous beam under live load, because of the continuous girder will produce the fulcrum in the negative moment, on the cross in the positive moment will also uninstall, the mo
5、ment distribution more reasonable. At present, the application of highway bridge engineering is very extensive.Through the data obtained, the first according to the bridge site at the raw materials and the grade of the road bridge design, I decided to bridge scheme selection, then the purpose of str
6、ucture stress force, safety and comfort, aesthetic, economic principles, the final choice of continuous box girder bridge is recommended by the continuous box girder bridge, Liang Gongqiao, variable cross-section continuous girder bridge with the three schemes. I recommend scheme by simply supported
7、 continuous construction method, first precast girder hoisting construction as continuous beam, on the main beam with highly variable cross-section box beam, I intend to design span of 30 meters. The six cross, four span bridge, a total length of 260 meters. In the design and calculation of the I fi
8、rst proposed the section size of the main components; then calculate the geometric characteristics of the main girder cross-section values and the control section of the internal design and in the state of ultimate bearing capacity value of the combination of internal force of the corresponding; the
9、 next reinforcement calculation, my plan is collected in the construction process of post tensioned prestressed steel beam construction, then estimates the number of prestressed steel beam and the layout. And then, according to the specification, the prestress loss is calculated. In the last, accord
10、ing to the normal use limit state were section strength calculation and stress check; after the checking results indicate that, the strength of the bridge, stress could meet the standard limit requirements, the full bridge structure and safe and reliableKeywords: prestressed concrete, continuous box girder, scheme comparison and selection目录第一章 绪论.1第二章 设计原始资料.42.1 设计依据 .42.2 设计内容 .42.3 主要材料 .4第三章 桥梁方案比选.73.1 桥梁设计原则 .73.2 桥梁设计方案图 .73.3 桥型综合评估及推荐方案确定 .9第四章 上部结构内力计算.114.1 主要构件尺寸拟定 .114.1.1 横截面 .114.1.2 梁高和细部尺寸 .114.2 主梁内力计算 .134.2.1 恒载内力计算 .
