Among the existing old bridges, the reinforced concrete rigid-frame arch bridge has a strong representation, it has the problem of lacking of capacity, and it has the disease of the cracking of the major or minor node. 在现有危旧桥梁中,钢筋混凝土刚架拱桥的病害特征具有很强的代表性,普遍存在着承载潜力不足的问题,并出现了大小节点开裂等病害。