Deterioration of railway reinforced concrete bridge structure attacked by chloride salt;

On basis of inspecting practice of deterioration of existing railway reinforced concrete bridge attacked by chloride salt, the migration characteristic of chloride ion in concrete and the corresponding deterioration characteristics of typical damaged bridge elements such as deck slab, bent cap, girder and pier are investigated in detail experimentally.

The scheme design of demolishing reinforced concrete railway pier by staticdemolition agent blasting, implementation method and blasting results are presented.

The structure defection analysis and the reinforcing technology to the reinforced concrete bridge;

Research on durability assessment for reinforced concrete bridge;

The durability of reinforced concrete bridge;

State-of-art of the mechanical behaviour of the corrosion reinforced concrete bridges;

With the rapid development of transport routes,it is important to find out whether the bridge can meet the heavy cargo transport development and take on the needs of large equipment transport tasks, as well as after the passage of overloading of vehicles how much will fatigue properties change on the existing reinforced concrete bridges, which are issues of concern to the urgent need .

Recently,the deterioration and damage of reinforced concrete bridges caused by durability inadequate were more and more serious and widespread,the normal use or security operations of the bridges were seriously affect,and the economic losses far beyond people\'s imagination.

The ultimate frequency can be taken as an important criterion for evaluating RC beam bridge load capacity.