装药参数影响钢筋混凝土柱毁伤效应的试验与数值仿真研究

Experimental and Numerical Analysis on Influence of Charge Parameters on Damage Effect of RC Column

装药参数是影响近爆作用下钢筋混凝土构件毁伤效应的重要因素,研究不同装药参数对构件毁伤的影响规律,对改进战斗部设计、优化火力打击方案具有指导意义。采用长径比为5.5、装药质量为10 kg、轴线与柱轴线方向平行的圆柱形装药,在比例距离r=0.2 m·kg^(-1/3)处开展了钢筋混凝土单层排架结构厂房的支撑柱的近爆毁伤试验,并设置了球形装药的对比试验。试验结果表明:圆柱形装药的毁伤效果强于球形装药,试验数据验证了数值仿真模型的可靠性。以圆柱形装药的长径比、炸高、药量和作用距离为研究因素,为各因素分别确定3个水平,利用正交模拟试验法设计并获得9种不同装药参数工况下钢筋混凝土的爆炸毁伤仿真结果,分析得到了圆柱形装药参数对钢筋混凝土柱毁伤效应的影响规律:圆柱形装药的药量对毁伤程度影响最大,长径比的影响次之,炸高对毁伤程度的影响最小;当4.5≤L/D≤6.5时,装药长径比越大对构件的毁伤效应越大;当炸高分别为1/4、1/2和3/4柱高度时,装药在1/4柱高位置处爆炸对支撑柱的毁伤效果最佳。

The charge parameters are crucial factors affecting the damage effect of RC components under close-in explosion.The study of the influence law of different charge parameters on component damage is of guiding significance for improving warhead design and optimizing fire strike scheme.A cylindrical charge with a length to diameter ratio of 5.5 and a charge of 10 kg was used to carry out near explosion damage tests of the supporting column of a reinforced concrete single-storey stacked structure plant at a proportional distance of r=0.2 m kg^(-1/3),and a comparison test of spherical charge was set up.The experimental results show that the damage effect of a cylindrical charge is stronger than that of a spherical charge,and the reliability of the numerical simulation model is verified by the experimental data.The length to diameter ratio,blast height,charge amount and action distance of cylindrical charge are taken as the research factors,and three levels are determined for each factor.The simulation results of blast damage of reinforced concrete under 9 different charging parameters were designed and obtained by orthogonal simulation test method,and the influence law of cylindrical charging parameters on the damage effect of reinforced concrete columns was analyzed.The amount of the cylindrical charge has the greatest effect on the damage degree,the ratio of length to diameter has the second effect,and the blast height has the least effect on the damage degree.When 4.5≤L/D≤6.5,the damage effect on the component is greater.When the blast height is 1/4,1/2 and 3/4 column height respectively,the explosion at the 1/4 column height has the best damage effect on the support column.