老化损伤石拱桥拱脚负弯矩区加固方案比选分析

Analysis of Comparison Among Reinforcing Scheme of Negative Moment Area at Button of Aging and Decreased Arch Bridge

相比于钢筋混凝土增大截面加固法,CFRP(Carbon Fiber Reinforce Polymer)筋材对老化损伤石拱桥拱脚负弯矩区进行加固具有自重轻、可操作性好、受天气影响小等优点,并充分利用CFRP筋材的高强性能。通过在一座服役20 a并受到损伤的石拱桥加固设计中,对CFRP加固的可行性进行了计算分析,并与钢筋混凝土加固方法进行对比,结果表明其在施工运输、工期、自重方面具有明显优势,被优先选用。可为以后的加固设计提供参考。

Reinforcing negative moment area at button of aging and decreased arch bridge with CFRP（Carbon Fiber Reinforce Polymer） bar has advantage of light weight, good operability, and it has little influence on whether, even it can make good use of high strength function of CFRP bar compare to the method of reinforcing by adding area with reinforced concrete. Practicability Of reinforcement of CFRP bars was made, as well as and the comparison with the reinforced concrete method. The result showed that reinforced by CFRP bars were advanced in transporting, schedule, and load, of course it was chosen. It will supply reference in the future.