Numerical study of fence type blast walls for blast load mitigation
Numerical study of fence type blast walls for blast load mitigation
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DOI：
10.1016/j.ijimpeng.2019.05.007
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发表时间：
2019-09
影响因子：
5.1
通讯作者：
M. Jin;Y. Hao;H. Hao
中科院分区：
文献类型：
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作者：
M. Jin;Y. Hao;H. Hao
基于爆炸波与障碍物的相互作用会产生波的反射、绕射和异相干涉，从而降低波的能量，提出了一种新型的由钢柱组成的栅栏式防爆墙。通过二维数值模拟和现场爆破试验，研究了这种新型防爆墙的减震效果。在本研究中，三维数值模拟进行了作为以前的研究的延伸，更全面地了解栅栏防爆墙的有效性。通过使用显式动态有限元分析软件AUTODYN 3D与验证的材料模型进行模拟。为了比较，还计算了钢筋混凝土（RC）墙在爆炸荷载下的反应。研究了钢杆截面形状、杆间距、栅栏层数和层间距等栅栏墙参数对栅栏墙缓冲爆炸荷载效果的影响。将防护网和钢筋混凝土防爆墙后的峰值超压、冲量和超压-时间历程与自由场进行了比较。结果表明，在合理布置的情况下，栅栏式防爆墙在降低冲击波超压和冲击波冲量方面的效果与钢筋混凝土防爆墙相当，甚至更好。此外，围栏防爆墙是不太可能产生的二次碎片危险与钢筋混凝土和其他固体墙时，发生近距离爆炸。因此，它是一个很好的替代爆炸屏障，在保护城市地区的关键结构。
A new fence type blast wall consisting of steel poles was recently proposed based on the idea that the blast wave-obstacle interaction could generate wave reflection, diffraction and out-of-phase interference to reduce the wave energy. The effectiveness of this kind of new blast wall in mitigating blast loading was investigated through 2D numerical simulations and field blasting tests. In this study, 3D numerical simulations are carried out as an extension of the previous studies for a more comprehensive understanding of the effectiveness of fence blast wall. The simulations are performed by using an explicit dynamic finite element analysis software AUTODYN 3D with validated material models. Responses of a reinforced concrete (RC) wall under blast load are also calculated for comparison. Influences of different parameters of the fence wall, including the cross-sectional shape of the steel poles, spacing between poles, number of fence layers and spacing between layers, on its effectiveness in mitigating the blast loadings are investigated. The peak overpressure, impulse and overpressure-time histories behind the fence and RC blast wall are compared with those in free field for evaluation. It is found that the fence blast wall, if properly arranged, could perform equally or even better than the RC wall in mitigating overpressure and impulse of blast wave. Moreover, fence blast wall is less likely to generate the secondary debris hazards associated with the RC and other solid walls when close-in explosion occurs. Therefore, it is an excellent alternative blast barrier in protecting critical structures in urban areas.