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首页> 外文期刊>Journal of structural engineering >Experimental and Numerical Investigations of Shock Wave Attenuation Effects Using Protective Barriers Made of Steel Posts
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Experimental and Numerical Investigations of Shock Wave Attenuation Effects Using Protective Barriers Made of Steel Posts

机译：钢制立柱防护屏障对冲击波衰减影响的实验与数值研究

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The use of protective barriers is one of the most common approaches to protect buildings and their occupants against blast and vehicle impacts. They increase the stand-off distance between the explosive source and the building. However, the protection capabilities of barriers with openings have not yet been thoroughly studied. The present paper discusses the shock wave attenuation effect of protective barriers made of steel posts with a hollow cross section. In the experiments, the steel posts are located at a distance of 5m to the building to be protected. Prior to the experiments, numerical models were developed to predict the blast loads numerically. Overpressure-time history measurements (side-on and reflected) were made at various distances in front of and behind the barrier. The experimental data were used to, for example, validate the numerical models. The experimental and numerical results showed that barriers can reduce the blast loads relative to the scenario in which no barriers were present. Considerable reductions in peak side-on and reflected overpressure and impulse were observed behind the barriers. Furthermore, after validation, parametric studies are carried out to investigate the influence of further parameters on the overpressure reduction behind the barriers, that is, the number of posts or the spacing between posts, the cross-sectional shapes of posts, and the arrangement of posts (single-layer or multilayer, aligned or staggered). These studies showed that a barrier without openings is not always necessary to offer the desired protection because barriers with openings can also show satisfactory results. Hence, the necessary amount of material (steel in this case) and, thus, the construction cost can be considerably reduced.
机译：保护性屏障的使用是保护建筑物及其乘员免受爆炸和车辆撞击的最常用方法之一。它们增加了爆炸源与建筑物之间的隔离距离。但是，尚未对具有开口的障碍物的防护能力进行彻底的研究。本文讨论了空心截面钢柱制成的防护屏障的冲击波衰减效果。在实验中，钢柱与要保护的建筑物之间的距离为5m。在实验之前，开发了数值模型以数值预测爆炸载荷。在障碍物前后的不同距离进行了超压-时间历史测量（侧面和反射）。实验数据用于例如验证数值模型。实验和数值结果表明，与没有障碍物的情况相比，障碍物可以减少爆炸载荷。在障碍物的后面观察到了峰值的侧向下降和反射的超压和冲量的显着降低。此外，在验证之后，进行参数研究以研究其他参数对屏障后面的过压降低的影响，即立柱的数量或立柱之间的间距，立柱的横截面形状以及立柱的布置。帖子（单层或多层，对齐或交错）。这些研究表明，没有开口的障碍物并非总是必须提供所需的保护，因为带有开口的障碍物也可以显示令人满意的结果。因此，可以显着降低所需的材料量（在这种情况下为钢），从而降低了建造成本。

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