Abstract Girder has become the most popular cross-section in place of T beam. Torsional stiffness of concrete box girder bridges can enhance the ability to resist partial load.The girder’s Wind performance is good,Which allowing lateral wind flow more smoothly through the structure to prevent wind-induced vibration damage. re-stressed concrete continuous Girder Bridge become one of main bridge types of the most full of competion ability. There are eight beams and five spans, with each span 30m and successive beam in the superstructure. Because of this bridge adopts the separated Subgrade,design only consider half of the subgrade design.The construction takes the method of precast box beam. 源￥自%六:维;论-文'网=www.lwfree.cn
According to the requirements and the standards of the design assignment, the graduate design is mainly about the design of superstructure of short-span pre-stressed concrete continuous box Girder Bridge .The calculation of the superstructure is carried out with a supposed section of the box beam, unit pision is done in detail on the 5×30m span to calculate the internal force of live loads and dead loads. The MIDAS has been applied during the calculation of the prestressing steel and the force, and the prestressing loss has been calculated referred to the new standards.
Keywords：Prestressing steel  Continuous beam  Girder

1、绪论    1
1.1、预应力混凝土连续梁桥概述    1
1.2  毕业设计的目的与意义    3
2、设计资料    4
2.1、桥梁概况    4
2.2 设计参数    4
2.3、材料    4
2.4设计参数    5
2.5设计标准及设计规范    6
3、模型建立与分析    7
3.1、计算模型    7
3.2、截面特性及有效宽度    8
3.3、主梁分段与施工阶段的划分    11
4、荷载内力计算    12
4.1、恒荷载计算    12
4.1.1、一期恒荷载    12
4.1.2、二期恒荷载    12
4.2、恒荷载作用下的内力计算    12
4.2.1、预制阶段恒载内力计算    12
4.2.2、二期阶段恒载内力计算    15
4.2.3、恒荷载作用下模型总体内力图    17
4.2、移动荷载作用下的内力计算    19
4.2.1、汽车荷载计算    19
4.2.2、汽车荷载冲击系数计算    19 源￥自%六:维;论-文'网=www.lwfree.cn
4.2.3、车道折减系数和横向分布系数    20
4.2.4、移动荷载引起的内力图表    20
4.3、支座沉降作用下的内力计算    23