弹丸对钢筋混凝土中钢筋交汇处侵彻效应研究

Research on the Effect of the Projectile Penetrating into the Reinforced Concrete Targets at the Intersection of the Steel Bar

考虑弹丸在钢筋交汇处与钢筋直接发生作用的情况,提出了弹丸侵彻钢筋混凝土的近似模型。利用该模型得到了弹丸侵彻钢筋混凝土过程中弹丸的加速度时间历程。计算结果与实验结果符合较好。用该模型分析了不同配筋结构、配筋尺寸和网眼尺寸对侵彻深度和侵彻过程的影响,结果表明:弹丸从钢筋交汇处侵彻时,当弹丸动能相对较小时,随着网眼尺寸的减小,弹丸的大部分能量均消耗在侵彻第一层配筋结构中,当弹丸动能较大时,不管网眼尺寸多大,第一层配筋均只消耗掉弹丸的部分能量;配筋直径和网眼尺寸对侵彻深度的影响较大。

Considering direct interaction of the projectile with the steel bar,the approximate model of the projectile penetrating into the reinforced concrete is established.Using this model,the acceleration-time history is obtained.Calculation data are in agreement with experimental data.The model is used to analyze the effect of steel bar size,steel bar mesh size and steel bar configuration on the penetration depth and the overload effect in penetration process.The results indicate that when the projectile penetrates into the reinforced concrete targets at the intersection of the steel bar,the steel bar mesh size and steel bar size have an important influence on the penetration;when the projectile has small kinetic energy,the first layer of steel consumes most of kinetic energy.On the other hand,no matter how much the steel bar mesh size is,part of kinetic energy is used up by the first layer of steel when the projectile has large kinetic energy.