Abstract
The terrorist attacks in Europe have highlighted the problem of safety in public places. It is enough to run a vehicle at high speed towards the crowd to cause a large number of injuries and victims. In response to these phenomena, the Municipalities have perimetered sensitive areas with protection tools. The authors of this work have already designed a mobile anti-terrorism barrier capable of stopping 3500 kg and 7500 kg vehicles with a speed of 64 km/h in a few meters. In this work, the connection of two barriers by ropes is designed using Finite Element (FE) method to perimeter large areas with a small number of devices. Steel and Dyneema® ropes are studied, discussing the number of ropes and the dimensions needed.
Highlights
In the recent past, terrorists have wounded and killed many civilians in Nice, Barcelona, London, Stockholm and Berlin by running heavy vehicles at high speed
It is enough to run a vehicle at high speed towards the crowd to cause a large number of injuries and victims
Three connecting ropes and one internal rope in Dyneema® The first case analyzed refers to the impact of a 7500 kg vehicle running at 64 km/h against two barriers placed at a distance of 1 m from each other and connected by Dyneema® ropes with a diameter of 20 mm
Summary
Terrorists have wounded and killed many civilians in Nice, Barcelona, London, Stockholm and Berlin by running heavy vehicles at high speed. In response to these attacks, Municipalities have fenced off crowded places such as squares and pedestrian areas, which are sensitive targets for this type of attack. Protection systems can be divided into: (i) fixed, (ii) retractable and (iii) mobile. Fixed barriers delay rescue operations because they make it difficult for any vehicle to enter the protected areas. Retractable systems (for example mobile bollards) allow the entry of authorized vehicles but they are still expensive because they are equipped with foundation and mechanisms necessary for their movement. Concrete Jersey barriers are commonly adopted to prevent vehicles from entering the opposite lane being more suitable for oblique impacts than for the normal impacts, which can occur in the event of a terrorist attack [2]
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