Damage behavior and assessment of hollow masonry walls reinforced with polyurea coating under explosive loading

Abstract

Polyurea spray-coated reinforcement of masonry walls, as a novel protective technology, has garnered widespread attention. To investigate the dynamic response characteristics of polyurea-coated hollow masonry walls under explosive loads, this paper developed a numerical simulation model corresponding to experimental conditions. The progressive damage process of PW was clarified, and the influence patterns of different coating methods and explosion ratio distances on the damage characteristics of hollow masonry walls were analyzed and summarized. The anti-explosion mechanisms of polyurea coatings under different coating methods were revealed. Based on a series of numerical calculations, non-dimensional damage parameters for the walls were defined, namely the maximum deflection ratio and the mass loss ratio, integrating the effects of the polyurea coating methods and explosion ratio distances on the extent of wall damage. Finally, a damage mode retrieval chart for polyurea-reinforced hollow masonry walls under explosive loads was established, providing engineering reference value for the polyurea reinforcement of hollow masonry walls.