预应力混凝土连续箱梁桥维修改造设计

Repair and Transformation Design of Prestressed Concrete Continuous Box Girder Bridge

大跨度预应力混凝土连续箱梁桥运营多年后容易出现箱梁腹板开裂及顶底板纵横向裂缝等病害,以主跨60 m连续箱梁桥为例,介绍了该桥的病害情况及可能产生的原因,进行了多项维修改造设计,并针对性地提出了腹板加厚及增加预应力钢束的加固方案,以解决腹板开裂、结构刚度不足等问题。该桥的加固设计,可为同类型桥梁加固设计提供参考。

After years of operation,diseases such as cracking on the web plate of the box girder and longitudinal and transverse cracks of the top and bottom plates often occur in large-span prestressed concrete continuous box girder bridges.In this paper,taking a continuous box girder bridge with a main span of 60 m as the example,the disease condition and probable causes were introduced.Various repair and transformation designs were conducted,and a targeting reinforcement plan of thickening the web plate and adding prestressed steel tendons was proposed to solve problems of cracking on the web plate and insufficient rigidness of the structure.The reinforcement plan for this bridge can provide a reference for the reinforcement design of similar bridges.