大跨度混凝土连续梁桥长期下挠加固方案研究

Study on Long-term Down-warping Reinforcement Scheme of Long-span Concrete Continuous Girder Bridge

摘要:

针对某城市主跨为129 m的预应力混凝土连续梁桥运营7 a以来中跨不断下挠情况，在不中断交通的条件下，从箱室内加体外预应力、外加结构角度出发，分析不同加固方案对挠度控制的有效性及其对原结构的影响，以期为加固已下挠的连续梁、防止其继续下挠提供一种有效的加固方案。

Abstract:

Aiming at the continuous down-warping situation of the middle span of an urban 129 m-span pre-stressed concrete continuous girder bridge since 7-year operation, from the perspective of adding the external prestressing inside the box and the external structure, the effectiveness of the different reinforcement schemes on the deflection control and the influences on the original structure are analyzed without the interrupting traffic in order to provide an effective reinforcement scheme for reinforcing the down-warped continuous girder and preventing it from continuously down warping.