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Published in:
2017 | OriginalPaper | Chapter
Numerical and Experimental Analysis of the Effect of Different Shapes of Rigid Barriers on Blast Wave Propagation
Authors : R. Hajek, M. Foglar
Published in: 30th International Symposium on Shock Waves 1
Publisher: Springer International Publishing
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Abstract
Many terrorist attacks have been carried out in the last few years, for example in Oslo, Norway (2011) and more recently in Boston, USA and in Volgograd, Russia (both 2013). Terrorist attacks are targeted mainly at public facilities, such as railway stations, government buildings, embassies, and the transport infrastructure. Due to the rise in this kind of threat, research on the effect of blast loading on structures and interiors has gained considerable attention.
This paper presents reduced-scale experiments on the effect of different shaped rigid barriers on blast wave propagation in the confined space of a railway station. The experimental data set was used for calibrating numerical FEM models for use in predicting pressure wave propagation. Very good agreement has been achieved between the experimental results and the numerical model results.
The experimental results and also the numerical modelling results showed no significant effect of solid rectangular barriers in reducing the peak overpressure of the air shock wave in the area behind the barriers. Although the results indicate some effect on lowering the peak overpressure, this is limited to the area directly behind the barrier. At a greater distance, the effect diminishes rapidly and the pressure wave reverts to almost its original strength.
In front of the barriers, the overpressure is increased, because the shock wave is reflected by the rigid barrier surface. The main benefit of such barriers would be that they absorb potentially harmful flying debris carried by the blast winds.