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本文以某高速公路上的一座上部结构采用5×30m+5×30m先简支后连续预应力混凝土箱梁桥为例。由于本桥在运营过程中发现主梁的腹板和底板均出现受力裂缝,后采用体外预应力加碳纤维布对其进行加固。加固完成后,通过加固前后的桥梁静载试验对比分析发现:预应力混凝土梁体如果在运营过程中已出现受力裂缝,影响到桥梁的刚度和受力性能,采用主被动加固法,可以大大改善桥梁的受力性能。但是,如果没有有效的措施将裂缝进行恢复和粘合,不论采用何种加固方法,都不能使梁体恢复到正常的设计受力状态。
In this paper, an upper structure of a highway using 5 × 30m +5 × 30m first simply supported after the continuous prestressed concrete box girder bridge as an example. As the bridge found in operation during the operation of the main beam of the web and the floor are subject to stress cracks, the use of external prestressed plus carbon fiber cloth to reinforce it. After the reinforcement is completed, through the comparison of the static load test of the bridge before and after reinforcement, it is found that if the prestressed concrete beam has occurred the stress cracks in the operation process and affects the rigidity and force-bearing performance of the bridge, the main and passive reinforcement method can be greatly Improve the bridge’s stress performance. However, if no effective measures are taken to restore and bond the crack, no matter what kind of reinforcement method is adopted, the beam body can not be restored to the normal designed stress state.