摘要

自锚式悬索桥作为一种特殊悬索桥桥型，在沉寂了多年之后，现在又重新引起工程界的兴趣。它保留了传统的悬索桥桥型，以其优美的外形受到工程师们的青睐。但此种桥型结构复杂，国内外对其研究的资料和成果也很少。本文主要是对一座中等跨度的正在施工中的混凝土自锚式悬索桥—抚顺万新桥进行设计和计算分析。

1. 理想索力的计算。悬索桥一般要求恒载作用下索力均匀，这样弯矩和剪力就分布均匀。此桥主塔采用滑动索鞍以及有一定的预偏量，所以桥塔在恒载作用下不受弯，调索时只需控制主梁的弯矩。使主梁弯矩尽量上下均匀，可得吊索的理想索力。

2. 主梁的计算。自锚式悬索桥是将主缆直接锚固于加劲梁的两端，所以求得的主梁的轴力很大，主梁的纵向只需配置普通钢筋。

3. 桥面板的计算。桥面板为双向板，按双向板求内力配筋。

关键词　混凝土，自锚式，悬索桥，设计

Abstract

As a particular kind of suspension bridge, self-anchored suspension bridge has made an appearance in field of engineering after years’ dreariness. Preserving shape of traditional suspension bridge, it causes the engineer’s favor by its elegant figure. Howener, due to complexity of its structure, there are little research data or achievement at home and abroad. This paper has put emphasis on design and computational analysis to a middle-span concrete self-anchored suspension bridge in construction—Fu Shun Wan Xin Bridge are done.

1. Calculation of the reasonal force of cable.The suspension bridge is commonly required the force of cable are uniformity when the dead load acted on the bridge. Then the shear and bending moment will distribute uniformly. The tower of this bridge adopts a sliping saddle and there are some declinations. Therefore the bridge tower doesn’t has bending moment when the dead load acted on the bridge.When we adjust the force of the cable, we just need control the bending moment of the girder. If the distribution of the girder bending moment is uniformly,the force of the cable is the reasonal force of cable.

2. Calculation of girder. self-anchored suspension bridge, the cable anchored at the two ends of the girder directly, so the axial-force of the girder is very great Therefore the girder only need ordinary reinforcing bar.

3. Calculation of deck slab. The deck slab is two-way slab, wo need calculate the deck slab according to the two-way slab.

Keywords　concrete, self-anchored, suspension bridge, design