Shear Capacity Of Corroded RC Beams Based On Softened Truss Theory

The load-capacity of the corroded reinforced concrete is one of the key assessment for assessing the durability of reinforced concrete structures. At present, for the Corrosion of reinforced concrete flexural bearing capacity of many studies, Mainly for corrosion of longitudinal bars. However, there is little research on the inclined section of corroded reinforced concrete shear properties, with diagonal rebars for corrosion of reinforced concrete shear bearing capacity of beams is almost empty, So, the bearing capacity of oblique section of corroded reinforced concrete beam with diagonal bars is an urgent need.The thesis describes the corrosion of reinforced concrete structure and its influence on the shear strength based on the oblique reinforcement for the corrosion of reinforced concrete with beams of shear bearing capacity were studied. Based on the tests for the first set of beam with stirrup corroded conducted by the research team, the second set of stirrups were carried out, inclined and vertical steel reinforcement corrosion of reinforced concrete are involved in shear performance tests. Beams based on two test load test results, comparative analysis of the stirrups and inclined cracks oblique muscle on the characteristics of corrosion, the deflection of beams, steel strain and concrete strain effects, studies show that: A group of test beams, Stirrup corrosion rate of less than 11.23%, the shear capacity of corroded beams have an increase of about 10% than the beam without corroded, The B group of test beams, when the stirrup corrosion rate of 31.14%, corrosion rate of 6.73% oblique rebars, the shear capacity of corroded beam compared with no growth of about 10%, with the oblique muscle corrosion rate increases, shear capacity Began to drop rapidly, indicating that the oblique rebars in the corrosion tests play an important role in shear capacity.Based on the angle softened truss theory, thesis established for tendons with oblique angle of reinforced concrete beams softened truss model, consider the strength and corrosion of steel reinforcement ratio, the use of steel bar corrosion after the stress - strain relationship, and then consider the stirrups and oblique rebars damage and corrosion of concrete will be able to reduce the impact of bonding after the introduction of stirrups and inclined bars were the correction factor established for tendons with oblique angle of corroded reinforced concrete beams softened truss model, and shear load Strength test values were compared, the calculated results and experimental results agree well prove angle softened truss model theory of corrosion of reinforced concrete beams with inclined applicability.