Uniaxial Compression Behavior of Confined Concrete Deteriorated by Corrosion of Reinforcing Steel
Takashi YAMAMOTO, Atsushi HATTORI and Toyoaki MIYAGAWA
Abstract:It is important to establish the verification method of load carrying capacity of RC flexural member deteriorated by the corro-sion of reinforcing steel. Most of studies on the influence of reinforcement corrosion on load carrying capacity have focused on the corrosion of longitudinal tensile reinforcement in RC flexural member. However, not only the corrosion of longitudinal tensile reinforcement, but also that of longitudinal compressive reinforcement and/or lateral confinement will affect the load-carrying be-havior of RC flexural member. In this paper, influences of the corrosion of longitudinal compressive reinforcement and lateral confinement on uniaxial compression behavior of confined concrete, that is the component of RC flexural compression zone, are investigated. As a result, it becomes clear that the corrosion of longitudinal compression reinforcement decreased the elastic modulus and compressive strength of confined concrete, and the corrosion of lateral confinement decreased the elastic modulus. On the other hand, the corrosion of confinement did not decrease the compressive strength, because of horizontally oriented crack due to corrosion of confinement. Furthermore, the corrosion of confinement reduced ultimate strain of confined concrete due to its rupture because the elongation of confinement was decreased by corrosion. Additionally, the calculating method of the ulti-mate strain of confined concrete based on strain energy balance concept was shown, where the reduction of elongation owing to the corrosion of confinement was taken into consideration. Key Words:Corrosion of reinforcing steel, Confined concrete, Uniaxial compression behavior, Compressive strength, Compres-sive ultimate strain, Strain energy