摘要：随着科技水平的日益发展，轻轨已经逐渐成为人们出行的主要交通工具。轻轨具有便捷、舒适、实惠等众多特点，深受大众的喜爱，一般会作为出行的首选交通工具。在建设轻轨时，一些路段肯定需要利用桥梁来进行横跨一些障碍物。这次的设计是关于轻轨高架桥方面的，高架桥一般用于穿越不良地质、密集交通网、人群密集等区域。高架桥有着跨径小、桥墩高度小等特点，一般在城市的密集区域分布较多，用于解决交通拥堵问题。本次设计的高架桥是简支梁桥，采用单箱单室的箱型截面。箱型截面的抗弯以及抗扭性质比较突出，所以该截面类型在铁路桥梁中应用较多。高架桥一般多采用多孔等跨的简支梁桥形式，不仅拥有外观美观的特点，还能更好地适应不同地质的地段。70110

毕业论文关键词： 轻轨；高架桥；简支梁桥；箱型梁；单箱单室

Structural Design of Left - side Viaduct of Guiyang Light Rail Line

Abstract: With the increasing level of science and technology, light rail has gradually become the main means of transport people travel. Light rail with convenient, comfortable, affordable and many other features, loved by the public, the general will travel as the preferred means of transport. In the construction of light rail, some sections certainly need to use the bridge to carry out some obstacles. This design is about the light rail viaduct, the viaduct is generally used for crossing the bad geological, dense transportation network, crowded and other areas. Viaduct has a small span, small pier height and other characteristics, generally in the city's dense areas are more distributed, used to solve the traffic congestion problem. The design of the viaduct is simply supported beam bridge, the use of single-box single-chamber box section. Box section of the bending and torsional resistance is more prominent, so the cross-section type in the railway bridge applications more. Viaducts generally use porous and other forms of simple support bridge, not only has the appearance of beautiful features, but also better adapted to different geological areas.

Key Words:  light rail; viaduct; simple beam bridge; box girder; single cell box

目  录

1  绪论 1

1.1  研究现状 1

1.1.1  国内研究现状 1

1.1.2  国外研究现状 1

1.2  发展趋势 2

1.3  设计内容 2

2  工程概况 3

2.1  水文条件 3

2.1.1  地表水 3

2.1.2  地下水 3

2.2  地质条件 3

2.3  设计基本资料 4

3  主梁截面设计 5

3.1  相关设计参数 5

3.2  主梁截面尺寸拟定 5

4  主梁效应计算 7

4.1  永久作用效用计算 7

4.2  可变作用效用计算 7

4.3  内力效应组合 9

5  预应力钢束的配筋计算 10

5.1  预应力钢束数量的估算 10

5.2  预应力钢束布置