This study is intended to investigate failure mechanism of plain concrete and reinforced concrete slabs subjected to a medium-velocity impact by conducting impact tests. In a series of tests, a steel projectile with a mass of 8.3kg collided a concrete slab with a thickness of 18cm. In order to examine impact response of the concrete specimen, impact load and reaction force were measured. Test results revealed that the impact velocity corresponding to the scabbing limit was about 40m/s and the failure mode of the concrete specimen subjected to the medium-velocity was similar to the punching shear failure.

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