NUMERICAL SIMULATION FOR THE INFLUENCE OF REINFORCEMENT ON PENETRATION RESISTANCE OF WIRE MESH REINFORCED CONCRETE PANELS

摘要

Different from plain concrete in which the strength mainly dominates its ability of resisting penetration, reinforced concrete may be influenced by both the concrete strength and the reinforcement ratio and arrangement. Reinforced concrete protective layers of fortified structures are considered key points in resisting missiles penetration. The usage of wire steel meshes reinforcement provides isotropic properties in two directions, high tensile strength, and high modulus of rupture. It also results in larger bond forces and reduces crack spacing and width compared to conventional reinforcement bars. Accordingly, A Nonlinear three-dimensional numerical simulation was carried out using AUTODYN 3D software, which use the hydrocodes to model projectile - targeted structure interaction problems. Fourteen numerical simulation tests were carried out on concrete panels (550 × 550 × 300 mm) that are reinforced with expanded wire steel meshes and subjected to 23 mm diameter steel ogive-nose projectile perpendicularly fired with striking velocity = 990 m/s. The parametric study aimed to study the influence of reinforcement ratio and arrangement on panel's penetration resistance. The parameters included are the reinforcement ratio; reinforcement position (rear face / front face); and reinforcement distribution along the panels thickness. The results proved that using the wired steel meshes decreases the size of damage regions in the front and rear face of the panels. Increasing the reinforcement ratio has insignificant impact on the penetration resistance while the position and the distribution pattern of reinforcement proved to relatively influence the penetration resistance.