Effect of Impact Position on Failure Energy of Semi-rigid Protection Barriers

Abstract:

In view of the current situation that the relationship between the failure energy of semi-rigid rockfall protection barriers and impact positions has not been accurately studied, LS-DYNA was used to establish a finite element model of semi-rigid protection barriers. The failure energy of the protection barriers at different impact positions was studied, and the energy dissipation laws of steel strands and steel columns were obtained. The damage modes of the protection barriers under various impact conditions were analyzed. Research shows that steel columns and steel strands are the main energy-dissipating components, and friction and damping account for a small proportion of energy consumption. When the rockfall impacts the center of mid-span, the failure energy of the protection barriers is greater than that when impacting the side span; when the rockfall impacts the center of mid-span and at a high longitudinal position, the failure energy is the maximum, and when the rockfall impacts at the bottom of the center column, the failure energy is the minimum. The steel columns are easily damaged when rockfall impacts the center of mid-span and the steel columns; the side columns are easily damaged when the rockfall impacts the bottom of the side spans or other low longitudinal positions; the steel strands break easily when the rockfall impacts other high longitudinal positions.