摘要本次毕业设计是以符合任务书要求和设计规范规定为前提，通过查阅相关书籍和资料再结合大学期间所学的专业知识，运用MIDAS软件完成预应力混凝土梁桥的设计。本着“安全、经济、美观、实用”八字原则，再考虑到设计的顺利完成，经过对各种方案优缺点的比较，本次设计最终决定采用简支变连续预应力箱梁桥。根据任务书要求，该桥共有4跨，每跨40m，采用分离式路基，路基宽度为24.5m，桥面宽度为24m，为双向四车道。单幅桥梁片数为4片，梁间距为2.4m。因为桥型对称，故设计是只考虑半面路基。57169

在设计之前，首先对整个桥梁模型进行总体布局设计，首先选定箱梁截面，再对4×40m跨径进行节点和单元的划分，在计算恒载内力和活载内力的基础上，进行荷载组合，再根据弯矩和剪力包络图以及短期效应组合配置预应力钢筋，然后通过验算和修改使模型满足设计要求。全桥均采用MIDAS软件进行计算，后期的相关图纸均采用CAD软件绘制呈现。

毕业论文关键词: 预应力混凝土连续梁桥   预制箱梁

Abstract  The graduation project is consistent with the mission statement requirements and design specification for the premise, through access to books and information learned during the combined expertise of the University, the use of MIDAS software to complete the design of prestressed concrete beam bridge. Through a variety of programs required, in a "safe, economic, aesthetic, practical" character principle, the design uses variable continuous prestressed simply supported girder bridge. According to the requirements of the mission statement, a total of four across the bridge, each span 40m, the use of separate roadbed, roadbed width of 24.5m, the bridge width 24m, two-way four lanes. Single bridge piece number 5, the beam spacing of 2.4m. Because the bridge symmetry, it is designed to consider only half of a roadbed.

  Calculation of the superstructure drawn box girder, span of 4 × 40m were very detailed application unit, calculated on the basis of dead load and live load internal forces on the internal forces, conduct load combinations, according to moment and shear envelope and short-term effects of portfolio allocation prestressing steel, then modify the model by checking and meet the design requirements. Full-bridge are used MIDAS software to calculate and draw the relevant design drawings using AutoCAD software.

 girder bridge            precast box beam

目录

1.绪论 7

1.1 预应力混凝土连续预制箱梁桥概述 7

1.2毕业设计的目的与意义 8

2.设计资料 9

2.1 桥梁概况 9

2.2 设计参数 9

2.3 设计要求 9

2.4计算原则、内容及控制标准 10

2.5规范标准 10

3.桥跨总体布置及结构尺寸拟定 11

3.1 本桥主料材料 11

3.1.1 混凝土 11

3.1.2预应力材料 12

3.1.3普通钢筋 12

3.2结构尺寸 13

3.3 桥孔分跨 15

3.4 截面形式 15

3.4.1 立截面 15

3.4.2 横截面