Detection And Evalution Of Durability Of R.c Bridges Under Marine Environment

Reinforced concrete bridges are widely used in existing bridges, but for a long time, the durability of concrete is often ignored by most of people. It causes a large number of reinforced concrete structure ineffective in advance during its service period, it brings huge economic losses and unnecessary spending to the world, so more and more scholars and engineering technical staff pay more attentions to the problem .so how to make an assessment of durability has become an urgent task in the research of R.C structure durability.Supported by"detection and evaluation for existing R.C. bridge in coastal areas"(project of Qing Dao TECHNOLOGY DIVISION), A series of studies have been proceeded for assessment and detection of ductility for reinforced concrete bridge, relevant test also have been done under marine environment. The major contents are mainly summarized as follows:1.Because cracks exist in the reinforced concrete bridge, long-term loading devices are used to simulate behavior of actual bridge, the steel corrosion conditions and the content of chlorine ion in concrete are studied with different proportion, different crack width, chloride etc., the rule of deteriorated damage is attained which provided experimental reference for reliability assessment of reinforced concrete bridge.2.Analytic hierarchy process (AHP) is listed in the paper. A typical concrete bridge is evaluated by Analytic Hierarchy Process(AHP), AHP is deeply studied according to the field and laboratory test results and the flexibility of AHP for ductility detection of reinforced concrete bridge under Marine environment is pointed out.