Definition of scaled distance of close-in explosion and blast load calculation model

GAN Lu; CHEN Li; ZONG Zhouhong; QIAN Haimin

doi:10.11883/bzycj-2020-0194

Volume 41 Issue 6

Jun. 2021

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GAN Lu, CHEN Li, ZONG Zhouhong, QIAN Haimin. Definition of scaled distance of close-in explosion and blast load calculation model[J]. Explosion And Shock Waves, 2021, 41(6): 064902. doi: 10.11883/bzycj-2020-0194

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GAN Lu, CHEN Li, ZONG Zhouhong, QIAN Haimin. Definition of scaled distance of close-in explosion and blast load calculation model[J]. Explosion And Shock Waves, 2021, 41(6): 064902. doi: 10.11883/bzycj-2020-0194

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Definition of scaled distance of close-in explosion and blast load calculation model

doi: 10.11883/bzycj-2020-0194

Engineering Research Center of Safety and Protection of Explosion & Impact of Ministry of Education, Southeast University, Nanjing 211189, Jiangsu, China

Received Date: 2020-06-12
Rev Recd Date: 2020-10-13

Available Online: 2021-06-01

Publish Date: 2021-06-05

Abstract

Abstract

How to accurately define “close-in explosion” has always been a hotspot in the field of protection engineering research. In this paper, based on the fully validated 2D axisymmetric fine finite element model, the characteristics and laws of the propagation of air shock waves and high-speed expansion of detonation products generated by TNT spherical charge were studied. It is found that there is a significant influence of the detonation products on the blast load on rigid wall when the range of the scaled distance less than 0.8 m/kg^1/3. It is recommended to use the scaled distance range from 0.30 m/kg^1/3 to 0.80 m/kg^1/3 as the definition criterion of close-in explosion for spherical TNT charge explosion. It was found that: due to the inhomogeneity and randomness of the detonation product rapid expansion, the peak value of the rigid-wall reflected overpressure experienced a sharp drop within a range of incident angle of 0°～5° in the case of close-in explosion defined in the paper. In addition, there were two peaks on the reflected overpressure curve in close-in explosion cases, and the first peak overpressure was caused by the interaction between the shock wave and rigid wall while the second peak overpressure was generated by the interaction between the detonation products and rigid wall. Based on curve fitting, the formulas for calculating the two peak values were proposed, respectively, and a simplified load model suitable for calculation of engineering structure response was put forward; The distribution law of the reflected overpressure on the rigid wall under close-in explosion was revealed.
- detonation products,
- scaled distance,
- close-in explosion,
- load calculation model

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References(21)

References

[1]	BRODE H L. Blast wave from a spherical charge [J]. The Physics of Fluids, 1959, 2(2): 217–229. DOI: 10.1063/1.1705911.
[2]	HENRYCH J. The dynamics of explosion and its use [M]. New York: Elsevier, 1979.
[3]	BAKER W E. Explosions in air [M]. Austin: University of Texas Press, 1973.
[4]	KINGERY C N, BULMASH G. Air blast parameters from TNT spherical air burst and hemispherical surface burst [R]. Aberdeen, Maryland, USA: US Army Ballistic Research Laboratory, 1984.
[5]	US Department of Defense. UFC 3-340-02 Structures to resist the effects of accidental explosions [S]. Washington: The US Department of Army, 2008.
[6]	SHIN J, WHITTAKER A, AREF A, et al. Air-blast effects on civil structures: MCEER-14-0006 [R]. Buffalo: Multidisciplinary Center for Earthquake Engineering Research, 2014. DOI: 10.13140/RG.2.1.3454.1686.
[7]	SHIN J, WHITTAKER A S, CORMIE D. Incident and normally reflected overpressure and impulse for detonations of spherical high explosives in free air [J]. Journal of Structural Engineering, 2015, 141(12): 04015057. DOI: 10.1061/(ASCE)ST.1943-541X.0001305.
[8]	SHIN J, WHITTAKER A S, CORMIE D, et al. Numerical modeling of close-in detonations of high explosives [J]. Engineering Structures, 2014, 81: 88–97. DOI: 10.1016/j.engstruct.2014.09.022.
[9]	KARLOS V, SOLOMOS G, LARCHER M. Analysis of blast parameters in the near-field for spherical free-air explosions: JRC101039 [R]. Italy: Joint Research Center, 2016. DOI: 10.2788/778898.
[10]	American Society of Civil Engineers. Blast protection of buildings [M]. New York: ASCE/ Structural Engineering Institute, 2011. DOI: 10.1061/9780784411889.
[11]	宁建国, 王成, 马天宝. 爆炸与冲击动力学[M]. 北京: 国防工业出版社, 2010: 110.
[12]	胡攀. 近距离爆炸下作用在建筑结构上的爆炸荷载模型研究[D]. 天津: 天津大学, 2016: 10.
[13]	ORTON S L, CHIARITO V P, MINOR J K, et al. Experimental testing of CFRP-strengthened reinforced concrete slab elements loaded by close-in blast [J]. Journal of Structural Engineering, 2014, 140(2): 04013060. DOI: 10.1061/(ASCE)ST.1943-541X.0000821.
[14]	李臻, 刘彦, 黄风雷, 等. 接触爆炸和近距离爆炸比冲量数值仿真研究 [J]. 北京理工大学学报, 2020, 40(2): 143–149. DOI: 10.15918/j.tbit1001-0645.2019.049. LI Z, LIU Y, HUANG F L, et al. Investigation of specific impulse under contact explosion and close-in explosion conditions using numerical method [J]. Transactions of Beijing Institute of Technology, 2020, 40(2): 143–149. DOI: 10.15918/j.tbit1001-0645.2019.049.
[15]	汪维, 刘光昆, 赵强, 等. 近爆作用下方形板表面爆炸载荷分布函数研究 [J]. 中国科学: 物理学力学天文学, 2020, 50(2): 024615. DOI: 10.1360/SSPMA-2019-0188. WANG W, LIU G K, ZHAO Q, et al. Study on load distributing function of square slab surface under close-in blast loading [J]. Scientia Sinica Physica, Mechanica & Astronomica, 2020, 50(2): 024615. DOI: 10.1360/SSPMA-2019-0188.
[16]	SMILOWITZ R, BLEWETT W, WILLIAMS P, et al. Design guidance for shelters and safe rooms (Providing protection to people and buildings against terrorist attacks) [R]. Washington: Federal Emergency Management Agency, 2006.
[17]	DOBRATZ B M, CRAWFORD P C. LLNL explosives handbook: properties of chemical explosives and explosive simulants: UCRL-52997 [R]. Livermore, California: Lawrence Livermore National Lab, 1981.
[18]	赵铮, 陶钢, 杜长星. 爆轰产物JWL状态方程应用研究 [J]. 高压物理学报, 2009, 23(4): 277–282. DOI: 10.3969/j.issn.1000-5773.2009.04.007. ZHAO Z, TAO G, DU C X. Application research on JWL equation of state of detonation products [J]. Chinese Journal of High Pressure Physics, 2009, 23(4): 277–282. DOI: 10.3969/j.issn.1000-5773.2009.04.007.
[19]	JIANG Z L. Shock waves [M]. Berlin: Springer, 2005: 855−860.
[20]	DROTLEFF J E, VINCENT C T, MULLIN S A, et al. Research in close-in blast loading from high explosives: ARL-CR-308 [R]. Virginia: U.S. Army Research Laboratory, 1996.
[21]	周丰峻, 陈叶青, 任辉启. 爆炸近区空气冲击波规则反射和非规则反射[C] // 祝贺郑哲敏先生八十华诞应用力学报告会——应用力学进展论文集. 北京: 中国力学学会, 2004: 98−112.