Modeling of Fragment Loads and Effects on Reinforced Concrete Slabs

摘要

This paper describes a technique used to characterize the loading and damage generated by the primary fragments from cased munitions on reinforced concrete slabs or walls. It has been observed that the damage generated by the fragments, while usually of secondary importance to the airblast, can in some circumstances dominate the response. Test observations indicate that fragments from cased conventional bombs, not only directly load a wall element through momentum transfer, but also create a substantial amount of damage on the wall's front face. This damage may include slicing of the reinforcement and complete removal of concrete from the front face to depths beyond the front face reinforcement. Single fragment tests have also shown that the momentum transferred is substantially greater than the fragment momentum prior to impact, due to the significant amount of concrete debris ejected from the impact crater. Equivalent forcing functions, in terms of pressure versus time, are derived to approximate both the momentum transfer and the damage generated in the concrete.