3、形验算、锚固区局部强度验算和挠度的计算。 设计最后结合本桥的特点编制施工方案，主要包括上部结构施工，下部结构基础和墩身的施工工艺等。78ABSTRACTGraduation is mainly on small-span prestressed concrete box girder bridge structure design.Prestressed concrete box girder bridge with good mechanical properties of the structure, deformation is small, the drivin
4、g comfort comfortable, a small amount of maintenance engineering, seismic and strong ability to become the most competitive one of the main bridge.And personal capacityby the time constraints, this graduation design is not specifically related to the lower part of thestructure. symmetric
5、al Span bridge design standards for the 20m,transverse standard span bridge 5 pieces,bridge the width of 8.5m,design for 2 lanes lane number.symmetrical balance pouring concrete. Design process is as follows： First, the beams of the main structure and the size, it must correspond with t
6、he provisions of the bridge and working together to resist and stiffness and to turn the stiffness of the design adopts the box girder. The thickness of the whole bridge is 0.18 m, floor thickness in the cross for 0.18 m, ends for 0.25 m. The second step to analyze internal gross force o
7、f the structures (including dead load and lived load), the internal force composition can be done by using the compute results. According to the internal force composited, the evaluated amount of longitudinal tendons can be worked out, then we can distribute the tendons t
