关键词: 桥梁工程, 肋拱桥, 套箍加固, 均匀设计, 功效系数法

Abstract: Aiming at the problem of quickly and objectively determining the optimal reinforcement scheme of ribbed arch bridge with hoops, the principle of uniform design and efficiency coefficient method was used. Considering the randomness of parameters affecting the reinforcement effect, such as concrete bulk density, reinforcement thickness of both sides, reinforcement thickness of arch back, reinforcement thickness of spandrel and elastic modulus of concrete, the section bearing capacity margin was selected as the evaluation index of reinforcement effect. At the same time, multiple response indexes were integrated into a single index, and the total efficiency coefficient was calculated based on this. According to the judgment of the total efficiency coefficient, the optimal reinforcement scheme was obtained. Meanwhile, combined with the response surface method, the sensitivity analysis of random variables to reinforcement effect was explored. The research results show that: among all the random variables, the thickness of arch back and spandrel is the most sensitive to the reinforcement effect of ribbed arch bridge, and when both of them reach 35%, they should be focused in the design. The sensitive percentage of concrete elastic modulus is only 4%, which can be less considered in the scheme design.

Key words: bridge engineering, ribbed arch bridge, reinforcement with hoops, uniform design, efficiency coefficient method