Layout considerations on compound survival shelters for blast mitigation: A finite-element approach

IF 2.1 Q2 ENGINEERING, CIVIL
Andreia Caçoilo, Rodrigo Mourão, David Lecompte, Filipe Teixeira-Dias
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Abstract

The safety of both military personnel and equipment in unstable regions has for a long time been a major issue and concern. Protective shelters with multiple configurations have been widely used to meet safety requirements. Since military compounds are subjected to different types of threats, such as the detonation of improvised explosive devices (IED), a good understanding of the response of such shielding structures to blast waves is critical. A three-dimensional finite element (FE) model of a corner-entry ISO 20 ft container HESCO-Bastion survival shelter is developed, validated and tested under the external detonation of explosive charges. The FE model is validated against experimental data and used to investigate the protective performance of the shelter by considering several design-related parameters, such as charge location, roof extension, interior corridor dimensions and the effect of venting and its location. Results are discussed in terms of peak overpressure and maximum impulse at discrete locations around the container, and it is found that the shelter is the least efficient in mitigating the blast load propagation when the explosive material is at an angle of 45° to the entrance. Also, while the protective roof at the entrance plays a significant role in protecting the container from air-borne threats, it is observed that it contributes to higher pressure and impulse data within the shelter, for detonations at ground level, with impulse amplifications as high as 94% when fully covering the entrance area. Contrarily, varying the distance between the container and the HESCO-Bastions is found to have minimal impact on the impulse, while naturally decreasing the peak pressure for increasing distances. Venting (through openings) can lead to up to 95% reduction in the peak pressure, whilst not affecting the impulse.
爆破减灾复合生存掩体的布置考虑:有限元方法
长期以来,军事人员和装备在不稳定地区的安全一直是一个重大问题和关切。多种配置的防护掩体已被广泛使用,以满足安全要求。由于军事设施受到不同类型的威胁,例如简易爆炸装置(IED)的爆炸,因此很好地了解这种屏蔽结构对冲击波的反应至关重要。建立了ISO 20英尺集装箱HESCO-Bastion生存避难所的三维有限元模型,并在外部爆炸炸药的作用下进行了验证和测试。根据实验数据验证了有限元模型,并考虑了几个与设计相关的参数,如装药位置、屋顶延伸、室内走廊尺寸以及通风及其位置的影响,用于研究遮蔽物的防护性能。通过对容器周围离散位置的峰值超压和最大冲量进行讨论,发现当炸药与入口成45°角时,掩体在减轻爆炸载荷传播方面效率最低。此外,虽然入口处的防护屋顶在保护容器免受空中威胁方面发挥着重要作用,但据观察,它有助于提高掩体内的压力和冲量数据,对于地面爆炸,当完全覆盖入口区域时,冲量放大高达94%。相反,研究发现,改变容器与HESCO-Bastions之间的距离对脉冲的影响最小,而随着距离的增加,峰值压力自然会降低。排气(通过开口)可以使峰值压力降低95%,同时不影响脉冲。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
4.30
自引率
25.00%
发文量
48
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