体外预应力法加固连续刚构桥实例分析

Case Analysis of the Continuous Rigid-frame Bridge with External Prestressing Technique

在近几年的桥梁检测中,发现很多桥梁出现严重的病害问题。其中,连续刚构桥的病害也是很严重的情况之一,为了使这些出现病害的桥梁能够继续安全的使用,就需要对病害桥梁进行加固。针对连续刚构出现跨中挠度过大,箱型梁腹板出现较多裂缝问题,采用体外预应力加固技术进行加固设计,恢复其正常承载能力。通过计算分析,最终得出此种加固方法便捷有效,可以推广使用。

In the recent years of bridge detection,we find that many bridges have serious disease. The disease of the continuous rigid- frame bridge is also very severe. If we want to use those bridges with disease as usual,we have to improve those problems of the bridges with reinforcement. The external prestressing technique discussed in the article is applied to improve those problems of oversize bending in the middle span of bridge and many fissures occurred in the sternum of box- beam. After the reinforcement,those bridges can be used as usual.Finally,we prove that the external prestressing technique is effective by calculation.