接触爆炸钢筋混凝土板的震塌效应

Explosion spalling of reinforced concrete slabs with contact detonations

为研究震塌对防爆结构的破坏效应,进行了有限厚度钢筋混凝土板接触爆炸分析研究。现场试验归纳出爆炸成坑、爆炸震塌、爆炸贯穿和爆炸冲切形态。采用LS-DYNA程序对板体的变形、破坏动态过程等进行了数值模拟,通过对影响爆炸震塌效应参数的分析,引入了新的震塌破坏系数及破坏等级,提出了新的震塌厚度计算公式。结果表明,数值模拟与现场试验吻合良好;震塌破坏厚度与装药量、板厚及其强度性质等因素有关。

The effect of explosion spalling on anti-blast structures was investigated using limited thickness reinforced concrete slabs subjected to contact detonations. The damage patterns on the slabs in the tests were classified as explosive catering, spalling, perforation, and punch. The deformation and the dynamic damage processes of the slabs were simulated using LS-DYNA. Analysis of the parameters affecting the spalling led to a new spalling damage coefficient and damage classification method with a formula to calculate the spalling thickness. The results show that the numerical results agree well with the experimental data and that the spalling thickness is related to the amount of charge, the thickness, and the strength properties of the slab.