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SHI Cheng-hua (High-grade Highway Engineering Supervision Co.,Ltd of Anhui Province,Heifei 230022,China)  
Owing to increase in traffic volume and improvement of the class of bearing capacity as well as service time and other factors, diseased bridges emerge endlessly.It is necessary to reinforce an old bridge.In this article,steel plate reinforcement and carbon-fiber reinforcement were introduced.It has been shown that reinforcement should be based on recognition of the situation of an old bridge.As a part of reinforcement work,crack mending has also effect on reinforcement.Actually,reinforcement with steel plate is much simple,but its contribution to improvement of bearing capacity is limited.Carbon fiber can improve the bearing capacity of the structure remarkably,but it is costly.So any choice should be based on practical conditions as to achieve economy.
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