预应力混凝土连续箱梁多采用薄壁箱型截面,这种截面具有较大的抗弯和抗扭刚度,偏心荷载作用下整体受力情况好,而且,该截面顶、底板面积较大,上面可以布置较多的预应力筋,并可同时承受正、负弯矩的作用。由于预应力混凝土连续箱梁具有这些技术优点,所以它在中、大跨径桥梁中的应用较为广泛。然而,在一些实际工程中,预应力混凝土连续箱梁往往会出现一些问题,如有些箱梁桥在施工当中 The prestressed concrete continuous box girder often adopts thin-walled box section, which has a larger bending and torsional stiffness, the overall stress under eccentric load is good, and the section top, floor area larger, above Can be arranged more prestressed tendons, and can withstand the positive and negative moments. As the prestressed concrete continuous box girder has these technical advantages, so it is widely used in medium-long span bridges. However, in some practical projects, some problems often occur in prestressed concrete continuous box girders. For example, some box girder bridges are under construction