Research On The Disease Analysis And Durability Evaluation Of Bridges For Middle And Short Span In Nantong

Bridge plays an important role in transportation system, and the damage degradation caused by lack of durability has become the issue concerned by people. Conservation and management of the bridge has also attracted a growing attention. This paper takes the concrete bridges with the small and medium span in Nantong as the research object and considers the environmental factors in coastal areas. The scopes of the study are summarized as follows:1) Study on the damages of the bridge with middle and short span. This includes the investigation and analysis of the present status and the diseases of the bridges.2) The durability testing of typical bridges is carried out. And the analysis can provide technical data and scientific basis for the study to the durability evaluation of the bridge.3) The durability evaluation index system for concrete girder bridge is established by using the analytic hierarchy process. The values of durability index are mainly studied. Also the variable weight theory is used. Finally, the method is applied to real bridges to verify the rationality and applicability.The research is based on the actual environment of the bridges in Nantong with a strong pertinence. It has guide meaning to the conservation, management, evaluation and reinforcement of the bridges in Nantong. Also it provides a technical reference for the durability evaluation of reinforced concrete bridges.