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

A Comparison of Damage Effectivenesses of Reinforced Concrete Beams by Single-point and Three-point Array Damage Patterns

为获得三点阵列接触爆炸的毁伤规律及增益效果,开展钢筋混凝土梁三点阵列接触爆炸、单点接触爆炸试验和数值模拟研究。观测在相同总装药量下的局部破坏特征,分析在不同毁伤模式下对局部毁伤效应的影响。研究结果表明:总装药量相同时,三点阵列爆炸过程中多个爆炸压缩波在梁构件内部传播并发生耦合增强效应,有效提升破坏威力,构件发生正面成坑、侧面崩落、背面震塌和截面冲切4种局部破坏模式,而单点毁伤模式仅发生正面成坑、侧面崩落和背面震塌3种局部破坏模式;结合有限元仿真结果,发现在一定范围内,随着炸药之间距离的降低,梁跨中的毁伤深度越大但迎爆面的损伤面积减小,随着炸药数量的增加,其迎爆面的损伤面积增大,但损伤深度相应的减小,这表明在接触爆炸载荷作用下,钢筋混凝土梁的破坏不仅与装药阵列距离和装药数量有关,还与阵列中单体装药的质量有关;研究成果可为钢筋混凝土梁的高效毁伤和提高爆炸能量利用率的研究提供一定的参考。

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.