单点及三点阵列毁伤模式对钢筋混凝土梁的毁伤效能比较

The single-point and three-point array contact explosion tests and numerical simulations of reinforced concrete beams are investigated to obtain the destruction law and the gain effect of three-point array contact explosion. The local failure characteristics under the same total mass of explosives were observed, and the effects on the local damage effect under different damage patterns were analyzed. The results show that, when the total mass of explosives is the same, multiple blast compressive waves propagate inside the beam member during the explosion of the three-point array and occur a coupling enhancement effect, effectively enhancing the damage power. Four local damage patterns of front cratering, side breakdown, back collapsing and section punching occur in the three-point array damage, and three local damage patterns of front cratering, side breakdown and back collapsing occur in the single-point damage under the action of contact explosion load. Combined with the finite element simulation results, it is found that,the depth of destruction in the beam span is higher, but the damage area of blast-face decreases as the distance between the explosives decreases; and the damage area of blast-face increases, but the damage depth decreases accordingly as the quantity of explosives increases. This indicates that the damage of reinforced concrete beams under contact blast loads is not only related to the distance of charge array and the quantity of charges, but also to the mass of individual explosives in the array. The research results can provide a certain reference for studying the efficient damage of reinforced concrete beams and improving the utilization of explosive energy.