Behaviour of high-strength concrete plates under impact loading

Abstract

This research programme was carried out to investigate the behaviour of high-strength concrete plates subjected to impact loading. The research includes an experimental investigation on 16 concrete plates. A rigid projectile was used to apply the impact load to the tested reinforced concrete specimens. The rigid projectile consisted mainly of a solid steel cylinder with 220 kg mass and 304·5 mm dia. contact area, dropped at variable heights of up to 4 m. The structural behaviour with respect to deflection, concrete and steel strains, failure mode and energy absorption was examined. The effects of dynamic loading, concrete strength, reinforcement ratio and support pattern were the test parameters. Based on the experimental test results, it has been found that at a test velocity of 4−7 m/s the impact load is about twice the static punching shear capacity estimated from code provisions.