某独柱墩箱梁桥抗倾覆加固设计

Design of Anti-overturning Reinforcement of Single-pillar Pier Box Girder Bridge

摘要:

连续箱梁桥下部结构为连续独柱墩的形式可能存在倾覆问题。对此结构形式桥梁进行抗倾覆加固设计值得研究。现结合某匝道桥抗倾覆加固案例，介绍一种在独柱墩处增设钢盖梁单支承变多支承的加固方案。计算显示增加支承可有效提高抗倾覆稳定性系数。最后对桥墩及钢盖梁进行了验算，证明此种加固方式安全可靠，可为类似加固工程作参考。

Abstract:

The problem of overturning may occur when the substructure of continuous box girder bridge is the continuous single pillar pier. It is worth to study the anti-overturning reinforcement design of this structure. Combined with an anti-overturning reinforcement case of ramp bridge, a reinforcement scheme of adding the steel bent cap with the multiple supports instead of single support at the single-pillar pier is introduced. The calculations show that adding supports can effectively improve the anti-overturning stability coefficient. Finally, the bridge piers and steel bent cap are checked to prove that this kind of reinforcement mode is safe and reliable, which can provide the reference for the similar reinforcement projects.