摘要：近年来，钢筋混凝土结构的发展是越来越成熟。由于钢筋混凝土结构能够很好的降低混凝土的开裂程度，并且充分发挥其材料特性，使结构轻型化得以实现。钢筋混凝土连续梁桥有比较好跨越能力，而且它还有像变形和缓、刚度较大、伸缩缝使用较少、能够平稳行车、养护方便等一系列优点，所以在近代桥梁建筑中已得到越来越多的应用。本文对桥梁结构的抗震安全性问题及智能材料的应用提供一种结合方法。目前迫切需要寻找一种经济实用、自复位抗震评价指标优越的桥梁结构形式，并建立相应的理论和方法。本课题拟以智能材料桥梁为研究对象，为今后国内城市高架的设计提供建议和参考，促进城市高架的安全稳固发展，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。拟建场地地貌单一，地形较为平坦。桥跨文章综合考虑桥梁的美观、经济、耐久适用以及环境协调和施工技术的要求，最终确定简支变连续预应力混凝土连续梁桥的设计方案。在该方案中，主梁部分施工采用在工厂预制型，然后吊装到位的方式。本设计中主梁选用工厂预制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。42555

毕业论文关键词：简支变连续；预应力筋；预应力混凝土结构；midas软件

A overhead ramp design in Seattle in America 

Lei haibo

(School of civil engineering, Civil engineering class 5 Grade 2012, 1210500507)

Abstract: In recent years, the development of reinforced concrete structures are more and more mature. Reinforced concrete structures can reduce the degree of cracking of concrete well, and give full play to its material properties , so it makes the structure of the light can be achieved. Reinforced concrete continuous beam bridge has a relatively good ability of spanning , and it  also has a series of advantages ,such as gentle deformation, greater stiffness, fewer joints using a smooth road, easy maintenance and so on, so it has been using increasingly in modern bridge building.This paper provides a combination of methods for the seismic safety issues and application of smart materials of bridge structure .There is an urgent need to find an economical and practical, excellent self-resetting seismic evaluation form of bridge structure and establish  corresponding theory and methods.This project is intended to use the smart material of bridge for the study, to provide advice and reference for domestic urban elevated design and promote the safe and secure development of urban elevated , and improving the design level of the bridge in our country.This bridge is a ramp bridge of urban expressway , located in Seattle,the largest city in the United States Pacific Northwest.The proposed site’s topography is single , the terrain is relatively flat.Article of bridge span has considered the bridge’s requirements of aesthetic, economic, durable and suitable and environmental coordination and construction techniques, and ultimately determined the design scheme of the change simply supported continuous prestressed concrete continuous beam bridge. In this scheme, some of the main beam construction using the way of prefabricated in the factory and hoisting into place. The design of the main beam selected factory precast prestressed concrete box-section beam, and after selecting the cross-sectional dimension, using midas software to complete the calculations of bridge design .

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

目  录

1 前言 1

2 设计概述 2

2.1 设计基本资料