爆炸冲击波在仿桥梁结构内传播的数值模拟

The bridge is an essential part in the transportation system, and its damage effect under the strong impact load is always a hot issue in the world. Currently, the explosive explosion is one of the most effective bridge damage methods. Therefore, the research on the explosive shock wave propagation law in the bridge structure plays an important role in the process of anti-explosion design and explosion accident rescue. In this paper, a local imitation structure of the bridge was constructed, and the experiment of the explosive blasting in the bridge was performed. Then, the self-developed software EXPLOSION-3D was adopted to simulate the propagation process of explosive shock wave inner the imitation bridge structure. The numerical simulation results were compared with the experimental results to verify the effectiveness of the numerical algorithm. Further, the propagation laws were analyzed according to pressure-time history curves at different positions. Besides, the explosion damage effects of the bridge structure at different locations and equivalent explosives were also evaluated. Based on the numerical simulation results, the damage degree towards to the human body and vehicle which reside in the imitation bridge structure were obtained. Finally, some safety preventive suggestions were given in the view of simulation after compared and analyzed the numerical results in the different conditions.