1、 本科生毕业设计说明书 题 目：留宝窑子桥桥梁设计 变截面预应力连续梁桥 跨径（55m+80m+55m） 学生姓名： 学 号： 专 业： 指导教师： I 摘摘 要要 包头北绕城公路留宝窑子桥，桥位处于包头北绕城公路 K714+860 处大青山南麓留 宝窑子沟，河谷较深，河宽约 200 米，为季节性河流，属黄河支流。河床稳定，河道较 为顺直。 根据毕业设计任务书，本设计主要分为五部分。 第一部分是对设计基本资料的整理及纵断面的计算。 第二部分是桥梁设计方案比选。 方案一是预应力混凝土 T 形连续梁桥；方案二是钢筋混凝土提篮拱桥，方案三是预应力 混凝土变截面连续箱型梁桥。经过分析比较，推荐方案三，
2、预应力混凝土变截面连续梁 桥。 上部结构为预应力混凝土变截面箱型梁， 下部结构为双柱式桥墩、 重力式 U 型桥台、 扩大基础。 第三部分是上部结构计算，包括主梁尺寸拟定、内力计算、预应力筋布置，截面验 算，预应力筋的布置及数量，预应力损失计算，预加力的组合，主梁截面强度计算。第 四部分桥墩及基础计算。第五部分是施工组织设计。 关键词：连续梁桥、内力计算、 。 II Abstract Liubaoyaozi Bridge located at the point of K714+860 in the highway around northern Baotou city , the bridge
3、 crosses Liubaoyaozi channel which at the South of Da Qing Mountain. The detch of the valley at there is about 200 meters.It is a seasonable river,which is a branch of the yellow river.The river bed is stable and the river course is straight to some extent. According to the graduation design task,it
4、 is mainly divided into 5 parts. The first part is to put the basic references in order and to calculate the surface area of vertical section. The second part is to compare the program of the bridge design.Program is preparing dint concrete continual bridge molded like T.Program is is to build a arc
5、h bridge made of steel reinforcing bar and concrete.Program is to build a preparing dint concrete continual bridge .By analynis and comparison,in the recommand program ,the upper structure can be preparing dint concrete continual beam and the lower structure can be two-bridge piered,and gravitationa
6、l bridge structure like U to enlarge the basis. The third part is the calculation of the top construction .This part includes the formulation of measurement, calculation of Inner force,the arrangements for preparing steel and chack calculation of cross section, the calculation of bridge pier beam,the block the loss of preparing dint, the compose of preparing dint, is the strength of the beam,s section. The forth part is the calculate of pier and foundation. The fifth part is the des
