Abstract
The design is based on graduation design task book requirements and relevant  industry standards。And the graduate design mainly analyzed about the effect of bride under various loads, according to the requirements and the standards of the design assignment. Prestressed concrete continuous beam bridge has become one of the most competitive bridge for its good performance of the structure,small deformation etc.The bridge uses the separation type roadbed, and it only considers the design of the half roadbed. Construction method take the method of  precast box girder.

The calculation of the upper structure uses box beam section,the span of 4 x 35m  is pided into a very detailed unit.Firstly, the calculation of dead load and live load is carried out, and the load combination is carried out, and the bending moment and shear envelope diagram are drawn.Secondly,making the calculation of the prestress loss according to the short-term effect combination of prestressed reinforcement. Finally, checking the continuous girder bridge to see  whether it meets the design requirements. The whole bridge are calculated by MIDAS software, all design drawings are drawn by AutoCAD, and the computer is compiled and printed, and the paper is printed. In addition, an English document, the stiffness of the externally prestressed concrete beams ,is also translated to Chinese.
Key words: design   prestressed precast    box girder    continuous girder bridge

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    9
2.设计资料    10
2.1 桥梁概况    10
2.2 设计参数    10
2.3 设计要求    10
2.4计算原则、内容及控制标准    10
2.5规范标准    11
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    13
3.2结构尺寸    13
3.3 桥孔分跨    16
3.4 截面形式    16
3.4.1 立截面    16
3.4.2 横截面    16
3.4.3典型横断面    17

3.5梁高    18
3.6横隔梁的设置    18
3.7截面尺寸    19
4.荷载计算    23
4.1恒载内力计算    23
4.2主梁分段与施工方法    23
4.2.1分段原则    23
4.2.2具体分段    23