Research on shear behaviour of shear beams as bond between concrete and rebar is locally deteriorated

Abstract

Bond between concrete and reinforcement bar has a significant influence on load capacity of structures. As reinforcement bar is corroded, such a bond is deteriorated and consequently affects structures\' load capacity. In order to profoundly understand the effect of bond on structural behaviour, particularly shear behaviour, numerical investigation would definitely be useful based on powerful numerical tools. In this study, shear behaviour with bond deterioration including shear strength, crack pattern and shear mechanism based on beam and arch actions is investigated by using 3-D Rigid-Body-Spring-Model (3-D RBSM). The results show that deterioration in bond strength may result in the transition in shear resistant mechanism – dramatically build-up arch action because tensile force in longitudinal bars could not transfer to concrete perfectly. This phenomenon leads to the changes in load capacity and failure mode of shear beams.