The article definition of low-cycle bond fatigue between concrete and reinforcing bars is presented. It has been experimentally established that low-cycle bond fatigue of reinforcement in concrete under high-level cyclic loading occurs during the elastic-plastic slip of the reinforcing bars. Furthermore, a formula is proposed to describe the low-cycle bond fatigue of concrete with deformed bars. This formula shows good agreement with experimental data; for the materials investigated, the relative low-cycle endurance value constitutes 0.88.
