INVESTIGATION OF LOCAL FAILURE MECHANISUM OF RC SLABS SUBJETED TO A PROJECTILE IMPACT

Abstract

In recent years, crucial damages to humans and structures caused by the impact due to natural disasters such as tornadoes and volcanic eruptions have occured, and the establishment of a protective design method is urgent. Although many studies have been conducted on the local failure of RC members subjected to a projectile impact, the failure mechanism of RC members was not sufficiently investigated. This study presents an investigation of the local failure mechanism of RC slabs subjected to a projectile impact. In order to investigate the impact response of RC slabs, numerical simulations were conducted. The sectional force of the RC slabs was calculated from the numerical simulation results, and the inertial force and shear force generated in the RC slabs were discussed. It was found that the impact load was balanced with the inertia force before the reaction force was generated, and the diagonal crack progressed according to the shear force generated in the cross section. It was also found that the local failure could be evaluated by comparing the shear force generated in the cross section and the improved capacity of punching shear failure.