摘要近十几年来，由于我国的科技的飞速发展，桥梁建设进入到了十分辉煌的时刻，其中大跨径预应力桥已经成为了主要桥型之一。它有整体性能好，变形小，结构刚度大等主要优点。本文的设计是主跨100米预应力混凝土三跨变截面连续箱梁桥，第一部分结合工程概况资料、技术要求、以及设计标准规范规定，并参考通过查阅已有的桥梁设计，设计出三种可行的方案，随后通过对经济造价，施工工艺等方面的比选得出推荐方案；第二部分完成结构设计计算，首先利用AutoCAD 进行尺寸的拟定，利用桥梁博士软件进行结构的内力计算，钢筋设计，以及截面的验算，并根据桥梁博士的计算结果来调整自己的设计，使得结构的安全性和稳定性得到保证。32768
关键词：预应力，变截面，连续箱梁，结构设计
毕业论文设计说明书外文摘要
Title The design of a three span continuous box girder bridge with variable cross-section
Abstract
In the past ten years,because of the development of the the technology,
The construction of bridges have entered a brilliant times.In these bridges,long-span prestressed bridges have become the most important types.They have many advantages,including a better structural stiffness,a smaller deformation and other superiority. This paper is the design of the main span of 100 meters of three span prestressed concrete box girder bridges, the first part of this paper , combined with the general situation of project information, technical requirements, design standards and specifications, and through reading the past bridge design, I designed three kinds of feasible solution, then through the comparison of economic cost, construction technology and other aspects.I got the recommended scheme selection; The second parts,I complete structure design calculation,including the size of the proposed using AutoCAD, using Dr bridge structureinternal force calculation , reinforcement design, and the calculation of the section, and according to the result of bridge, bridge of fine-tuning,to makes the safety and stability of the structure.
Keywords Prestress Variable section Continuous box girder Structural design
目 次
1 绪论 1
1.1 预应力三跨变截面连续箱梁桥概述 1
1.2 设计说明 1
1.2.1 设计标准与规范 1
1.2.2 设计标准及技术条件 1
1.2.3 主要材料 1
1.2.4 工程地质条件 2
1.2.5 桥梁设计要点 2
1.3 毕业设计的目的与意义 2
2 方案比选 4
2.1 方案一：三跨变截面连续箱梁桥 4
2.2 方案二：中承飞燕式拱 7
2.3 方案三：独塔斜拉桥 10
3 上部结构设计与计算 14
3.1 基本计算数据 14
3.2 设计要点及结构尺寸拟定 15
3.3 毛截面几何特性 15
3.4 关键输入数据说明 17
3.4.1 结构自重 17
3.4.2 车道荷载 17
3.4.3 人群荷载 18
3.4.4 桥面铺装荷载 18
3.4.5 荷载横向分布系数 18
3.4.6 冲击系数 18
3.4.7 施工及使用阶段升、降温 19
3.4.8 支座不均匀沉降 19
3.4.9 非线性温度 19
3.5 结构模型与计算图式 19 三跨变截面连续箱梁桥设计:http://www.751com.cn/gongcheng/lunwen_29506.html