Numerical Simulation of Single-Span T-Shaped Bridge Under Explosion Load

As an important hub for crossing river cliffs in road transportation, the protective effect of bridges has always been the focus of research. In this paper, LS-DYNA software is used to simulate the process of explosion shock wave damage to large single-span T-beam bridge, and the influence of explosive type, detonation position and bridge reinforcement on the damage degree of bridge deck is studied. The results indicate that WY-1 explosive has the most severe impact on bridge damage among GOL-2 and WY-1 explosives. When only reinforcing steel is laid on the flange of the T-beam, the blast resistance performance of the bridge is significantly improved compared to without reinforcing steel. When explosives detonate at different positions on the bridge deck, there is no substantial damage to the entire bridge. But when the equivalent explosive is placed on the ground near the bridge pier, the pier completely fractures, the bridge collapses, and loses its load-bearing function. The research results provide a reference for the protection of bridges under explosive loads.