Research On Strength And Corrosion Resistance Of Reinforced Concrete Bridge

Finite element analysis was used to simulate the stress-strain behavior of reinforced concrete beams via a composite model. The mechanical response of the appropriate reinforcement beam and the surplus reinforcement beam, which were loaded in the experiment conditions, was computed. The potential critical failure area of the reinforced concrete beams was analyzed by the detail study of the stress distribution. In the design of the reinforced concrete structures, the strength grade from C30 to C50 of concrete is usually matched with Grade II and III of steel bars. The mechanical characteristics of the above groups of matching have been investigated. Corrosion behavior was studied both by experimental and numerical approaches. The mechanical properties of partial corrosion and entire corrosion in the reinforced concrete structure were analyzed. Dot Corrosion and Delamination models were employed during the simulation. Finally, the mechanical properties of a T-beam of an actual bridge have been analyzed. Results show that the use of the 3-D finite element model is suitable and the precision of the simulation is acceptable. It was found that the load carrying capacity, from high to low, of different matching of the concrete and steel bar is as follows: C50-III, C45-III, C40-III, C35-III, C30-III, C50-II, C45-II, C40-II, C35-II and C30-II. "The Delaminating Model" could be adopted to simulate the condition of entire corrosion on steel bars. The corrosion of the steel bars in the concrete has important influences on the load carrying capability of the reinforced concrete structures.