Research on strengthening effect of the prestressing technology on the deteriorating trussed combination arch bridge

Compared with traditional truss bridge, the composite truss arch bridge has advantages of simple construction and low cost. But many problems in this kind of bridges have arisen in recent years. For example, cracks in different degrees at the connection of the main truss and solid arch truss, at intersection of bars especially at the arch foot and double vertical bars are usually common. The deflection in some bridges are slightly too large because of the low stiffness. With the analysis of common diseases in truss arch bridges, this paper proposes a kind of technology about external prestressing reinforcement. It proves that this reinforcement method is rational and feasible; Reinforcement effect is obvious based on comparation before and after the bridge reinforcement.