【作者】 陶家清；

【导师】 廖光明；

【作者基本信息】 四川大学 ， 结构工程， 2003， 硕士

【摘要】 我国西部山区河流地带众多，适宜修建拱桥。虽然目前钢管混凝土拱桥的发展很快，但是由于其自身材料特点，其发展具有一定局限性。在我国钢产量连续处于世界第一的形势下，大力推广大跨度钢拱桥的建设，对于西部大开发，具有特殊的意义。 本文在讨论了现代钢拱桥的发展的基础上，以国内第一座Bacellona组合结构跨江公路钢桥—拉萨柳梧大桥项目为依托，对其进行了设计分析。 根据桥梁规范，对柳梧大桥的组合结构进行了结构简化分析，将一个复杂的空间结构分解为两个平面结构进行计算。针对该桥自身的特点，对拱肋矢跨比，轴线方程，截面的几何尺寸等主要技术参数做了探讨。建立了两种空间模型，通过与平面模型计算结果的对比分析，对计算模型得出了新的认识。 对于柳梧大桥这样的大跨度钢拱桥，由于其处于西部高原地区，属于抗震等级要求较高的桥梁，有必要进行动力计算。通过三维仿真模型的动力特性计算，求得了桥梁的自振频率和振型，分析了结构模型的特点，同时也为地震动力计算的分析提出了建议。更多还原

【Abstract】 Arch bridge has been built in west China because of many mountains and rivers. Though the concrete-filled steel tubes bunch grows quickly, it is confined by its material properties. As the steel amount has been the first in the world, it has great sense to generalize the steel arch bridge for west development.This paper discusses the development of recent steel arch bridge. Based on the first Bacellona combination structure, cross-river road bridge-Liuwu bridge, we analysis its load behavior.According to the bridge standard, we analysis the combination structure, simplify it and decompose the complicated space structure into two plane structure hi order to calculation. In connection with its self properties, we make an inquiry into the major parameters, such as ratio of height and span, equation of arch axis, geometry size of section and so on. Building two space structures, by analysis the result of plane model and space model, we get new cognition about it.As a large span steel arch bridge and located in the west plateau, it is necessary to calculate its dynamical action because it belongs to higher anti -seismic lever. Through the three dimension simulation dynamical properties calculation, we get the frequency and vibration mode of this bridge , analysis the feature and give advice to earthquake calculation.更多还原