Large Span Prestressed Concrete Continuous Rigid Frame Bridge Analysis Of Typical Damage And Research On Reinforce Countermeasure

Along with the continuous and quick development of our national economy, as the infrastructure, transportation business plays more and more important role in our lives and our national economy. As the traffic volume increases quickly and there are more and more overloading vehicles, the lack of consideration for the duration of the bridge structure in the original Code for Bridges Design, the bridge disease of the exist highway also goes up. In order to make full use of the exist bridges, reduce the engineering price, save money, a period of time should be needed for reinforcing the disease bridges.As the factors of the design, construction, material and the operational management, large span continuous rigid frames produce many bridge diseases, such as deflections in the middle of span, crack in the box beam and in ross girder on the top of the pier. On the basis of bridge reinforcement, this paper has analyzed mechanism which produces the diseases of the multi-span continuous rigid frame bridges and it also has introduced reinforcement design, reinforcement plan and reinforcement effect.Through the analysis above, we have come to a conclusion that: 1. As the complexity of the shrinkage, creepage and the damage of the continuous rigid frame, careful design should be conducted in the time of design of large span continuous rigid frame. At the same time, reasonably laying prestress tendons and improving bending moment layout of the main beam is one of the effective measures to reduce structure shrinkage and to reduce the creeping effects to the deflection. 2. Bad quality of construction is the main factor results in the disease of large span continuous rigid frame bridge, Thus, quality control should be enhanced in the construction of the continuous rigid frame to ensure that the constructive engineering meet the requirement of the construction technology. 3. We can improve the force condition and prevent the disease by means of the reinforcing measures, such as increasing external prestress affixing CFRP sheets and reducing the load and reconstruction on bridge deck.