大跨度预应力混凝土变截面连续箱梁桥设计

Design of Long-Span Prestressed Concrete Continuous Box Girder Bridge with Variable Cross Section

大跨度预应力混凝土连续箱梁开裂问题较普遍。通过参考各国设计规范的有关规定,重点介绍大跨度预应力混凝土变截面连续箱梁设计过程中及构造处理上应考虑或注意的事项,以尽可能减少裂缝的产生,并提出了2种竖向预应力的设置方法。

Cracking is a problem commonly seen in longspan prestressed concrete continuous box girder. With reference to the relevant provisions in the design specifications of several countries in the world, this paper presents the matters that should be considered and noticed in the design of longspan prestressed concrete continuous box girder with variable cross section and in the handling of structural layout in order to mitigate the cracking to the possible minimum, and also proposes two kinds of layout of vertical prestressing systems.