Impact resistance of unequal diameter double U-shaped metal energy dissipation bearing

Abstract

To effectively improve energy dissipation buffer performance in shed tunnel and building roof rockfall disasters, we designed and developed a metal energy dissipation buffer bearing for an overhead roof rockfall protection system and studied its impact resistance through an experiment using the finite element method. The results showed that the energy dissipation capacity of the unequal diameter double U-shaped bearing increased linearly with displacement, and it could be reused by mechanical stretching. Hence, it was an ideal energy dissipation bearing device. The optimal inner diameter ratio of the upper and lower U-shaped structure was 5/9, and the structural load-bearing and energy dissipation capacity could be adjusted by changing the thickness of the structure. The strain mode of the structure was large deformation in geometry and small deformation in material; hence, the structure gave full play to the deformation performance of the material. The structure could be used repeatedly, and the cushioning performance remained unchanged. These conclusions provide a scientific basis for the design of roof sheathing and tunnel sheds in practical engineering.