悬臂式防爆墙消波作用数值分析及其应用

Numerical Analysis and Application of Shielding Effect of Cantilever Blast Wall

在建筑物外部一定距离上设置防爆墙,能对汽车炸弹爆炸冲击波和碎片起到有效的防护,消除爆炸冲击波对建筑物及内部人员的破坏杀伤作用。应用Ls-Dyna程序,模拟分析了爆炸冲击波在设置悬臂式防爆墙的三维流场中的传播情况,并与不设置防爆墙的三维流场计算结果进行对比,得到了防爆墙后爆炸冲击波的超压衰减率。针对一重要建筑物,作者应用所得结果分析了拟构筑的防爆墙的消波作用和建筑物的安全。文中所用方法和成果可供防爆墙设计时应用参考。

Car bombs can have a devastating effect not only on the occupants of a building but also on the building structure itself.Blast walls are placed at some distances from a building to provide protection to that building from the effects of an explosive attack by terrorists.The spreading states of blast shock wave in three-dimension flow field,in which a cantilever blast wall is placed,are computed using Ls-Dyna software.The results are analyzed and compared with the one without blast wall.The over-pressure attenuation rates of shock wave owing to blast wall are obtained.And upon the results abovementioned,operations of a planned blast wall around a key building and the safety of the building are evaluated.The methods and results adopted in the paper can serve as valuable reference for planning the blast walls outside key buildings to block off car-bomb attacks.