有粘结预应力筋加固连续箱梁技术研究

Technology Research on Reinforcing Continuous Box Beams by Bonded Prestressed Tendons

以某中等跨径预应力混凝土连续箱梁桥为例,在增大截面以及体外预应力2种加固方式的基础上,提出了采用有粘结预应力筋加固的方法,对该桥箱梁进行腹板斜截面抗裂加固。加固前后荷载试验的实测对比分析与理论计算证明,其加固效果明显,可为同类桥梁进行维修加固提供有益借鉴。

A medium-span bridge of prestressed concrete continuous box beams is taken as an example, a reinforcing method using bonded prestressing tendons is studied and proposed on the basis of the two reinforcing methods to strength the crack resistance of the web＇s diagonal section of the box beam. The measured values of the two load tests pre and after reinforcement are compared and analyzed. The results combining the measured values and the theoretical values prove that this reinforcing method＇s effect is obvious. It will provide useful reference to the reinforcing of the same kind of bridges.