Concepts and Functions in the Building Engineering

Concepts and Functions in the Building Engineering

Investigation of the Effect of Velocity in the Ogive Projectile on the Energy Absorption Mechanism and Damage Pattern in a Three-Layer Reinforced Concrete Slab

Document Type : مقاله پژوهشی

Authors
Safa Payman 1
Seyed Mehran Mahdian 2
1 Professor, Department of Civil Engineering, Emame Hoseyn University, Tehran, Iran
2 Master's degree student in Passive Defense, Design Orientation
Abstract
In this study, the impact resistance of multilayer reinforced‑concrete slabs with compressive strengths of 30 MPa, 40 MPa and 140 MPa was investigated under the action of an oblong projectile impact using the Abaqus software. The slabs considered have overall dimensions of675×675   mm and a total thickness of 200 mm; each individual layer is 6.66 mm thick. The slabs were subjected to projectile impacts at velocities of 641 m /s and 541 m /s. The projectile mass is 0.386 kg, its length is 152 mm, its diameter is 3.25 mm, and it has a caliber‑ratio head radius of 31 Based on the results, the optimal arrangement of the concrete layers from the highest to the lowest compressive strength (140 MPa – 41  MPa – 30 MPa) provides the greatest energy absorption and the lowest residual projectile velocity. This configuration achieves a performance close to that of a monolithic high‑strength slab while using the material more efficiently, making it an economical option for protective structures.
At lower impact velocities the slab mainly dissipates energy, but as the velocity increases the projectile tends to follow the path of least resistance rather than activating the slab’s energy‑absorption capacity. Consequently, failure occurs primarily by channel formation, clearly indicating that each reinforced‑concrete slab possesses a threshold impact velocity above which the failure mode changes.
 
Keywords
Abaqus
reinforced concrete slab
numerical simulation
impact and penetration
projectile

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