Author(s)

E. Galuta, M. Majeed, W. Reghig

Abstract

This paper represents the analytical investigation of the performance of reinforced concrete structures retrofitted with steel and non-metallic grids against high velocity projectile (0.50 cal. Bullet). In order to investigate the performance of the retrofitted structures, a number of concrete slab panels with the dimensions of 600 × 600 × 100 mm retrofitted with steel mesh, glass fibres, and polyethylene grids were analytically investigated using ANSYS AUTODYN 3D. Different retrofit schemes using different layers of grids, changing the location and numbers of these layers inside the concrete panels were implemented in this investigation. The residual velocity of bullet, kinetic energy of fragments and penetration depth were obtained and compared for the retrofitted structures. The analytical investigation showed that the proposed retrofit provided significant impact resistance capacity in comparison to regular reinforced concrete slab panels. Furthermore, the number and location of layers for the grids had a significant effect on reducing the velocity of the bullet and kinetic energy of fragments.

Keywords

impact, penetration, retrofitting, projectile, concrete, steel mesh and non-metallic grids