The Analysis Of Flexural Behavior Of Localized Corroded Reinforced Concrete Beams

Reinforced concrete (RC) structure is the most important structure in the civil engineering. Damage due to reinforcement corrosion affects the durability of RC structures greatly. Corrosion of reinforcing bar in RC structural elements leads to reduction of the cross-section of the reinforcing bar and change of steel mechanical properties, longitudinal cracking of concrete cover and change of bond strength between steel and concrete. These mentioned factors greatly influence the mechanical behavior and the load carrying capacity of RC structural elements.Firstly, starting from the corrosion of reinforced concrete constitutive relationship, the bond-slip relationship between the corroded steel and concrete and the selection of simulated corrosion cell are discussed. According to the failure criteria of concrete, it discusses the cracks in concrete structures damaged after the treatment and the stress softening after cracking.Secondly, it is studied that the stiffness of nonlinear finite element model COMBIN39 in ANSYS was simulated to analyze corroded reinforced concrete member.Then four localized analysis of corroded reinforced concrete straight beams and three localized analysis of corroded reinforced concrete curved beams are established and studied the flexural properties of corroded reinforced concrete beams at the different partial corrosion rates.Steel and concrete stress-strain, cracking, deflection, the amount of steel and concrete relative slip are studied.Finally, it analyzed the failure mechanism and process from the corroded reinforced concrete beam failure modes. Corrosion cracking of pre-and post-corrosion cracking of the bearing capacity of reinforced concrete beams has been studied and established their own carrying capacity assessment model. Collected some of the corroded reinforced concrete beam test data and validated of the evaluation model is reasonable.