爆炸冲击作用下钢筋混凝土板的动态响应研究

为研究爆炸载荷下钢筋混凝土板的动态响应，基于量纲分析得到了球形装药质量、爆心距和钢筋混凝土靶板挠度之间的无量纲关系.利用有限元软件AUTODYN建立空气-炸药-钢筋混凝土板的三维数值模型，考虑炸药、空气和靶板之间的流固耦合相互作用，模拟结果和实验结果基本吻合.改变固支条件为四边固支，控制单一变量，分别得到装药质量和爆心距对靶板挠度的影响规律.结果表明，保持爆心距一定，当比例距离大于0.6 m/kg^1/3的情况下，即不考虑近场爆炸和接触爆炸，钢筋混凝土板中心挠度随装药质量增加近似呈线性递增趋势；而当改变爆心距时，挠度随爆心距的增加近似呈指数递减趋势.

Research on Dynamic Response of RC Slab under Blast Impact Loading

In order to study the dynamic response of reinforced concrete slab under blast loading, the method of dimension analysis was employed to obtain the relation between spherical charge''s quality, distance between explosive and target plate, and the deflection of reinforced concrete target plate. A three-dimensional numerical model for air-explosive-reinforced concrete slab was developed by using the finite element software AUTODYN. Considering the fluid-solid coupling interaction among explosives, air, and components, the simulated results were consistent with the experimental results. The fixed conditions were changed from two-side to four-side. The distance between target and explosive and the charge weight were respectively controlled to investigate their effects on target deformation. The results showed that the central deflection of reinforced concrete slab increased linearly with the increase of charge quality when the scale distance was larger than 0.6m/kg^1/3 (not consider the near-field explosion and contact explosion). However, the central deflection exponentially decreased with the increasing distance between explosive and target if the distance between explosive and target is alterable.