In recent years, extensive experimental studies have been carried out to establish a rational structural design method for reinforced concrete structures against local damage caused by the impact of various external projectiles. Through these techniques, several techniques for improving the impact resistance of reinforced concrete plates have been proposed. Of these techniques, attaching a steel liner on the rear face of the plates is considered to be one of the most effective methods for improving the impact resistance of reinforced concrete plates. In this paper, the predicting method of local damage to reinforced concrete plates with a steel liner caused by the impact of projectiles is studied. To evaluate quantitatively the effect of a steel liner in preventing local damage, the existing formulas are employed conveniently and the prediction of the proposed formulas is verified by analytical results using the Discrete Element Method and experimental results.
