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At present, China's small and medium-span bridges over five hundred and fifty thousand, and most of the low level in technology, capacity of poor county and township roads, how to use limited resources efficiently reinforce these bridges is an important issue. In this paper, finite element analysis software for structural reinforcement system for nonlinear analysis. Mainly on the T-shaped cross-section, hollow section and box-section of 11 members before and after reinforcement capacity analysis to determine the different strengthening methods to improve the bearing capacity of the bridge magnitude, and through value engineering analysis, the different methods of strengthening economic analysis. Through comparative analysis of different forms for different sections of the bridge span reinforcement assessment made for the practical reinforcement select the appropriate reinforcement reinforcement methods and estimated capacity increase rate reference. In the reinforcement cost analysis, this paper refer to the relevant quota, combined with market practice, to develop a high-strength steel wire reinforcement, steel reinforcement paste, paste increasing section carbon fiber reinforcement and reinforced to take charge sheet, calculated by taking the fee table and the actual cost of cost is more consistent, reference for similar projects. The main achievements are the following. A bridge section of different forms of reinforcement for small and medium span bridges have a greater impact on the rise, with the span box girder section beam than the T-shaped cross-section to enhance the rate higher than 16%. 2, for the hollow section members, Carbon fiber reinforced bearing capacity were increased by 16% -56%, bonded steel reinforcement of capacity were increased by 16% -60%, high-strength steel wire mesh - reinforced polymer mortar carrier power increased by 20% -60%, increasing the bearing capacity of reinforced sections were increased by 19.5% -62%, the greater the margin of increase is smaller components span. 3, for the T-shaped cross member, Carbon fiber reinforced bearing capacity were increased by 2% -23%, bonded steel reinforcement of capacity were increased by 12% -32%, high-strength steel wire mesh - reinforced polymer mortar carrier power increased by 20% -40%, increasing the bearing capacity of reinforced sections were increased by 20% -40%, the greater the margin of increase is smaller components span. 4, the different methods of reinforcement reinforcement cost difference between the larger, bonded steel reinforcement costs of high-strength steel wire mesh - reinforced polymer mortar costs 4.9-5.7 times as Carbon fiber reinforced costs 1.29-2.5 times for increased cross-section reinforcement the cost of 2.57-3.67 times.
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