Introducing a New Relation for Calculating the Explosion Wave Decay Coefficient

Document Type : Original Article

Authors

1 Faculty of passive defense, malek ashtar university of technology, iran

2 Faculty of Passive Defense, Malek Ashtar University of Technology, Theran, Iran

3 Faculty of Passive Defense, Malek Ashtar University of Technology, Tehran, Iran

Abstract

Today, due to the increase in terrorist attacks and the need to protect structures and infrastructure against these threats, especially explosive threats, the issue of analyzing the response of structures against these loads is one of the topics of the day. One of the important parameters in analyzing the response of structures is the nature and mode of the impact of the explosive load. This can be seen in the relation presented for explosive pressure in theoretical analyzes. According to the Friedlander relation, the blast pressure decreases exponentially over time, and various relations are proposed to calculate the decay coefficient of the exponential function (such as the Kinney-Graham method, the Ismail-Murray method, the Karlos- Solomosand method, etc). This coefficient indicates how the slope rate of the explosion wave time pressure graph decreases. In this paper, by examining other existing methods for calculating the decay parameter, a new relationship for the explosion pressure reduction parameter in the near and far range is presented; A comparison is also made between the relationship observed in this study and other relationships presented for the blast wave decay coefficient. The results showed that the decay parameter presented in this study with high accuracy can calculate the actual explosion pressure and this leads to a better analysis of structures against explosive threats. In this research, the high accuracy of the calculated relationships for the decay coefficient has been investigated in three ways: A) Based on the regression coefficient of fitted graphs, the value of R2 is close to one; B) by the comparison between the values of the calculated decay coefficient with other existing relations; C) Based on the actual blast pressure calculated in two numerical examples.

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Main Subjects

References

[1] U.S. Department of Defense. (2014). Structures to Resist the Effects of Accidental Explosions. UFC 3-340-02.
[2] Smith, P. D., Hetherington, J. G. (1994). Blast and Ballistic Loading of Structures. Butterworth-Heinemann.
[3] Zamani, J., Mousavi, M.W. (2015). Explosion mechanics, hydrocodes and numerical analysis. Tehran. K.N. Toosi University Press.
[4] Kinney, G. F., Graham, K. J. (2013). Explosive Shocks in Air. Springer.
[5] Ismail, M. M., Murray, S. G. (1993). Study of the Blast Wave Parameters from Small Scale Explosions. Prop. Exp. Pyro. 18(1). 11-17.
[6] Lam, N., Mendis, P., Ngo, T. (2004). Response Spectrum Solutions for Blast Loading. Electron. J. Struct. Eng. 4(4). 28-44.
[7] Larcher, M., Herrmann, N., Stempniewski, L. (2006). Explosions Simulation Leichter Hallenhüllkonstruktionen. Bauingenieur. 81(6). 271-277.
[8] Teich, M., Gebbeken, N. (2010). The Influence of the Underpressure Phase on the Dynamic Response of Structures Subjected to Blast Loads. Int. J. Prot. Struct. 1(2). 219-233.
[9] Guzas, L., Earls, J. (2010). Air Blast Load Generation for Simulating Structural Response. Steel Compos. Struct. 10(5). 429-455.
[10] Karlos, V., Solomosand, G., Larcher, M. (2016). Analysis of the Blast Wave Decay Coefficient Using the Kingery–Bulmash Data. Int. J. Prot. Struct. 7(3). 409-429.
[11] Kingery, C. N., Bulmash, G. (1984). Air Blast Parameters from TNT Spherical Air Burst and Hemispherical Surface Burst. U.S. Army Armament and Development Center. Ballistics Research Laboratory.
[12] Borgers, J., Vantomme, J. (12-14 August 2008). Improving the Accuracy of Blast Parameters Using a New Friedlander Curvature α. In DoD Explosives Safety Seminar.
[13] Goel, M. D., Matsagar, V. A., Gupta, A. K., Marburg, S. (2012). Review of Blast Wave Parameters. Def. Sci. J. 62(5). 300-306.
[14] Shirbhate, P. A., & Goel, M. D. (2021). A critical review of blast wave parameters and approaches for blast load mitigation. Archives of Computational Methods in Engineering, 28(3), 1713-1730.
[15] Ullah, A., Ahmad, F., Jang, H. W., Kim, S. W., & Hong, J. W. (2017). Review of analytical and empirical estimations for incident blast pressure. KSCE Journal of Civil Engineering, 21(6), 2211-2225.
Journal of Structural and Construction Engineering
Volume 8, Issue 11 - Serial Number 51
February 2022
Pages 310-321

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History

  • Receive Date: 18 May 2021
  • Revise Date: 15 June 2021
  • Accept Date: 07 July 2021

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