文档介绍：摘要
本设计是根据设计任务书的要求和《公路桥规》的规定,对棋盘山立交桥进行方案比选和设计并对棋盘山跨越鱼塘部分的桥梁进行结构设计计算。对于棋盘山立交桥,为使其桥型与周围环境相协调,又节省资金,本论文提出两种不同的立交桥型方案进行比较和选择:方案一为小环型立交桥,方案二为变喇叭式立交桥。通过对桥梁安全、经济、适用、美观、和使用效果等方面的比较,确定变喇叭式立交桥为推荐方案。跨越鱼塘部分的桥梁结构形式定为等截面预应力混凝土箱形连续梁桥。
在设计中,桥梁上部结构的计算着重分析了桥梁在施工过程中,恒载内力的计算。运用力法方程求解活载内力影响线,并根据新规范的规定进行活载的加载,进而求出活载内力。另外还进行了主梁的配筋计算,估算了钢绞线的六种预应力损失。进行了预应力阶段和使用阶段主梁截面的强度和变形验算、挠度及预拱度的计算。下部结构采用以钻孔灌注桩为基础的单墩柱,支座采用盆式橡胶支座,并分别对支座、桥墩和桩基础进行了计算和验算。根据本桥跨鱼塘线通车的特点和现场条件,采用了满堂红支架的施工方案。
本设计的全部图纸采用AutoCAD绘制。另外,本论文还翻译了《预应力混凝土桥梁》”的英文文献。
关键词:变喇叭式立交、预应力、等截面箱形连续梁、计算机辅助设计
Abstract
A design of partial bridge structure over the railway in Qi panshan was finished in this paper, according to Designing Assignment and the Standard of Road and Bridge. Based on type of the bridge corresponding with the ambience and cost saving, this paper provides two different types of bridge for selection. The first one was circular crossroads and the second one is trumpet crossroads. After parisons of economy, appearance, characteristic under the strength and effect, the second one is selected for this design. The bridge striding over fishpond adopted pre-stressed concrete continuous bridge.
In the design, in construction process of the structural calculation of the upper part in the continuous bridge, the permanent load were simulated and calculated. The method of Force Equation is used to calculate the influence line of the variable load. Also the method of the dynamic programming is used to load the variable load. Then the pre-stress loss was estimated. The checking calculation of strength for main girder was preceded not only during period of pre-stressing force but also in using. The deformation of the main girder, deflection, pre-camber and the assessment of reinforcing steel bar were checked too.
The pier of the bridge was based on digging pile, and the rubber pot bearing is adopted. According to the characteristic of the overpass bridge and locale condition, a red construction were adopted.
All of the design drawings