건설재료시공학연구실

Building material & construction lab.

Abstract

This study evaluated the fracture properties and strain behaviour on the rear side of concrete panels subjected to high-velocity (983J, 170m/sec) projectile (66.8g, 25mm) impact. As a results, it was confirmed that the compressive stress generated in the front side of concrete panel due to high-velocity projectile impact, and then transformed into the tensile stress on the rear side. The tensile strain on the rear side was restrained by the reinforcement of the hooked steel fiber. In addition, it was improved the tensile deformable capacity and impact resistance performance of fiber reinforced concrete rather than normal concrete. Therefore, to reduce the local fracture of the concrete, reinforcing the hooked steel fiber is considered to be more effective than increasing the concrete thickness. And also, it is useful to evaluate the strain history of concrete panel subjected to high velocity impact for verifying the safety performance of protection wall against impact load