某公路四跨45m双曲拱桥病害分析及加固

Fault Analysis and Reinforcement of Four-span 45-m Double-curve Arched Bridge of a Highway

钢筋混凝土双曲拱桥在上世纪70年代应用比较广泛,其中绝大部分在现代公路交通运输中仍发挥着巨大的作用。但由于设计标准较低,再加上多年超载运营,桥梁病害严重,承载能力降低,对行车安全构成了严重的威胁。该文系统地总结了既有钢筋混凝土双曲拱桥的病害,并指出了病害产生的原因,根据双曲拱桥的结构特点和病害特征,研究了双曲拱桥的维修加固措施,并以一座实际桥梁为工程背景,将维修加固措施应用到实际当中。通过加固前后桥梁抗力的对比可知,该文所提出的维修加固措施对双曲拱桥是非常有效的。

The steel reinforced concrete double-curve arched bridges were widely built in 1970s.The most of these bridges play an important role in the modern road transport till to now.The bridges are faulted seriously and the carrying capacities are reduced because of lower design standard plus the overloading operation for many years,which threatens the driving safety greatly.The article systematically summarizes the faults of the existing steel reinforced concrete double-curve arched bridges,and points out the cause of faults.Based on the structural characteristics and the fault characters of the double-curve arched bridges,the article studies the maintenance reinforcing measures of the double-curve arched bridge,and applies the measures into the practice by taking a practical bridge as the background.Known from the comparison of bridge resistance before and after reinforcement,the maintenance reinforcing measures put forward in the article is very effective for the double-curve arched bridges.