Effect Of Corroded Longitutal Reinforcements On Shear Capacity Of Simple Supported Concrete Beam Without Stirrups

Corrosion of longitudinal reinforcements affect badly shear capacity of reinforced concrete beams. The effect of corrosion of reinforcements on shear strength of corroded reinforced concrete beam is one of important problems needed to studied in durability assessment of concrete structures.In this paper, first, introspect of assessment and prediction study on corrosive degree of reinforcement in concrete structure, the mechanical property change of corroded reinforcements, then through the experiment of 6 corroded reinforced concrete beams without stirrups and 2 uncorroded reinforced concrete beams without stirrups, the effect of corrosion rate of longitudinal reinforcement on deformation, crack forming and development, bearing capacity of the simply supported reinforced concrete beams without stirrups are investigated. The test results show that the corrosion of the longitudinal reinforcements reduces the constraint the longitudinal reinforcements to concrete. The influence of cracks due to longitudinal reinforcement corrosion on shear strength of beam is effective. The failure model of beams is determined by the shear-span ratio. The longitudinal reinforcement corrosion has significant influence on the shear bearing capacity of the beam without stirrups. By the ANSYS software the reinforced concrete beams are analysed in nonlinear finite element method. A model of reinforced concrete beam is established to analysis the bond behavior between corroded steel bars and concrete. Based on the research and the shear mechanics of reinforced concrete beams, the effect of corroded longitudinal reinforcement on shear capacity of simply supported concrete beams is studied. The calculating formula for shear capacity of simply supported concrete beams with corroded reinforcements is provided.