Design of steel-concrete composite panels under low-velocity impact: Local punching failure

Abstract

Steel-concrete composite panels (SC panels), consisting of two layers of steel plates and one layer of in-filled concrete, have excellent impact resistance. Currently, the proposed impact-resistant design methods of SC panels under low-velocity impact only consider the overall bending failure mode, but are unsuitable for the more common local punching failure mode. This study establishes an ideal tri-fold line resistance function and theoretically derives the stiffness and resistance of SC panels for the local punching failure mode. Furthermore, from the energy perspective, a design method is proposed in the study with impact-side steel plate tearing and SC panel penetration as safety criteria, and a design process covering two types of failure modes is provided. The design process is applied to the SC panel of the AP1000 nuclear station, and its practicality is validated, providing a simple tool for researchers and engineers.