摘要：   在最近，钢筋混凝土结构的设计，在桥梁建造上有着很好的发展前景。解决混泥土开裂问题，钢筋混泥土有着很好效果，并且能充分发挥其材料特性，使结构轻量化。钢筋混凝土连续梁桥能够存在很大的跨度，还有很多另外的变型优点，伸缩缝少等，所以在城市干道有着越来越多的应用。目前迫切需要寻找一种经济实用、适应当地地形和气候变化桥梁结构形式，做出合理的设计以。本课题拟以新型材料桥梁为研究，今后国内平坦地区大城市高架的设计作为参考，促进城市高架的稳定安全使用，提高我国桥梁设计水平。本桥为城市快速路的匝道桥，桥梁位于美国太平洋西北区最大的城市西雅图。我们建场地地貌单调，地势很为平坦。桥跨将会综合思考桥梁的美观、经济、耐久适用和环境协调和施工技术的要求，使用预应力混凝土连续梁桥进行设计。在该设计方案中，主梁部分应该在施工中采用在工厂预制，在进行吊装。主梁用预应力混凝土箱型截面梁，在拟定截面尺寸后，利用midas软件完成该桥设计计算。81440

毕业论文关键词：箱型截面梁；混凝土结构；midas软件

Abstract: In recent years, reinforced concrete structure has a good development prospects。 To solve the problem of concrete cracking, reinforced concrete has a very good effect, and can give full play to its material properties, so that the structure of lightweight。 Reinforced concrete continuous beam bridge can exist a large span, there are many other advantages of variants, less expansion joints, so in the city trunk has more and more applications。 There is an urgent need to find a kind of economic and practical, adapt to the local terrain and climate change bridge structure form, make reasonable design。 This paper intends to use the new material bridge as the research, the future of the domestic flat area of ​​the city's elevated design as a reference to promote the stability and safe use of urban elevated to improve the level of China's bridge design。 The bridge is a city expressway on the ramp bridge, the bridge is located in the United States Pacific Northwest's largest city of Seattle。 The proposed site of a single terrain, the terrain is relatively flat。 The bridge crosses the design of the continuous prestressed concrete continuous girder bridge in consideration of the beautiful, economical, durable application of the bridge and the requirements of environmental coordination and construction technology。 In this program, the main beam part of the construction used in the factory prefabricated, and then hoisting。 The main beam with prestressed concrete box section beam, in the development of cross-sectional size, the use of midas software to complete the bridge design calculation 

Key words: Simply supported change continuously; Prestressed reinforcement; The prestressed concrete structure; Midas software

目  录

引言 6

1 桥梁概述 7

1。1 设计基本资料 7

1。1。1 工程概述 7

1。1。2 设计原始参数 7

1。1。3 设计原材料 7

1。2   设计规范 9

1。3 midas结构计算相关参数 9

2 桥型方案及结构尺寸拟定 10

2。1 桥跨总体布置 10

2。1。1 桥梁总跨径