双装药同步爆炸钢筋混凝土梁毁伤效应

To study the damage effect of synchronous explosive loading of double charges on reinforced concrete (RC) beams, the experiments were conducted on RC beams subjected to the synchronous explosive loading of double charges. The damage characteristics and displacement response of RC beams were obtained through the experiments. Based on the experimental results, a corresponding RC beam synchronous explosion simulation model with double charges is established using finite element simulation software, considering the influence of simply supported boundary conditions. The reliability of the simulation model is verified by comparing the local failure characteristics and maximum displacement responses of RC beams from experiments and simulation. Based on this, the effects of charge spacing and blast height on the failure characteristics and displacement of concrete beams during synchronous explosion of double charges are further studied. In addition, the damage effects of double charges and equivalent single charges on the concrete beams at the same blast height are compared. The results show that the failure mode of concrete beams gradually changes from local failure to punching shear failure with the increase of charge spacing. As the charge spacing increases, the displacement response and front surface failure of concrete beam shows a trend of first increasing and then decreasing, mainly due to the enhancement effect of shock wave superposition during synchronous explosions of two charges. Besides, compared to the destructive effect of a single charge with the same total mass on concrete beams, the local damage of RC beams under the action of double charges is more uniform. Moreover, there exists a range of intervals related to charge spacing, within which the displacement response of RC beams under double charges is greater than that under equal mass single charge: the smaller the blast height, the larger the range of this interval; The larger the charge mass, the larger the range of this interval.