Experimental investigation about dynamic bond-slip between reinforcing steel bar and concrete

The aim of the present research is to assess the dynamic performance of bond-slip between reinforcing steel bar and concrete. Precisely, the sensitivity of the bond stress-displacement relationship in the interface between reinforcing steel bar and concrete to strain rate is investigated. In this paper, the reinforcing steel bar/concrete specimens were tested in dynamic push-out experiments with modified split Hopkinson pressure bar (SHPB) system. The incident bar was used to apply compressive loading to single steel bar embedded in a surrounding concrete. Using this technique, the debonding progress was analyzed. Besides, the effect of loading rate and effective depth on the push-out tests was studied with the impact velocities in the range of 9 m/s - 29 m/s. It is seen that maximum push-out force increases with increasing loading rate. In addition, the dynamic interface bond force does not proportionally increase with the effective depth of steel bar.