An experimental study on the damage effects of the concrete slabs under low-velocity impact

In order to investigate the damage effect of concrete slabs under low velocity impact, six groups of concrete slabs were tested by a drop hammer tester, and the effects of different impact velocities, concrete slab strength, and length-thickness ratio on the impact damage of concrete slabs were analyzed. A high-speed camera records the whole process of crack occurrence, development, and destruction of each test piece during the impact process. The test shows that under the impact load, the crack distribution of the concrete slab has a clear trend with the impact velocity increasing to the impact point. At higher energy, the concrete slab is punched and damaged near the impact point; and the board is deduced based on the experimental phenomenon. The calculation method of the impact force of the overall deformation of the structure was compared with the experimental results, which shows that the error of the calculation method are within 25%. © 2019, Editorial Office of Journal of Vibration and Shock. All right reserved.