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An Investigation to Optimize the Layout of Protective Blast Barriers Using Finite Element Modelling

机译:用有限元建模优化保护抗屏障布局的研究

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The past has shown that the risk of terrorism is on the rise as can be seen in many events. Terrorist attacks such as the 2004 Madrid bombings, the 2005 London bombings, the 2013 Boston bombing and the 2017 Manchester bombings have shown the impact acts of terrorism has on the public. Nowadays, terrorist attack is likely to increase in the wider area in the future together with a higher density in train passengers. Previous researches into protective measures have been focused on the structure. However, the impacts of terrorist attack on human have not been fully investigated. The needs for protective measures for the public have never been greater. This research aims to investigate the optimum layout for protective blast barriers situated on a train station platform using finite element analysis. The 3-dimensional structure is modelled and analysed using LS-DYNA.The focus is placed on an island platform at Birmingham New Street Station, which is one deemed to be at high risk of terrorist threats. Two shapes of barriers were tested, straight and angled. A total of six models were created and tested against two scenarios. Scenario one is a bomb placed on the ground, scenario two is a bomb being carried. The results focus on the impact the pressure created from the blast has on a person's lungs and head. Both can cause the most fatalities due to bombings. The results demonstrated that the shape of the barriers had no effect on the pressure. However, it can be concluded that an increase in the number of barriers, reduced the pressure below the critical amount for lung damage. Increasing the number of intervening objects between the bomb and target has a positive effect on the reduction of blast pressure. The insight into this study will help railway and structural engineers to establish strategic preventing methods to minimise catastrophic damage to and potential losses of the public.
机译:过去表明,在许多事件中可以看到恐怖主义的风险正在上升。恐怖袭击,如2004年的马德里爆炸,2005年伦敦爆炸,2013年波士顿轰炸和2017年曼彻斯特爆炸事件表明了恐怖主义对公众的影响行为。如今,恐怖袭击可能会在未来的更广泛的地区增加,以及火车乘客的密度更高。以前对保护措施的研究已经集中在结构上。然而,恐怖主义攻击对人类的影响尚未得到充分调查。对公众的保护措施的需求从未如此大。本研究旨在使用有限元分析来研究位于火车站平台上的保护性爆炸屏障的最佳布局。使用LS-Dyna进行建模和分析三维结构。重点放在伯明翰新街站的岛屿平台上,被认为是恐怖主义威胁的高风险。测试两种形状的障碍,直接和倾斜。共创建和测试两种情况的六种模型。场景一个是一个放在地上的炸弹,两个是被携带的炸弹。结果侧重于影响爆炸的压力在一个人的肺部和头部。两者都可能导致由于爆炸造成的最多死亡。结果表明,屏障的形状对压力没有影响。然而,可以得出结论,障碍物数量增加,降低了低于肺损伤的临界量的压力。增加炸弹和靶之间的中间物体的数量对爆压压力的减少具有积极影响。本研究的见解将帮助铁路和结构工程师建立战略预防方法,以尽量减少灾难性的损害和公众潜在损失。

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