丁阳, 陈晔, 师燕超. 室内爆炸超压荷载简化模型[J]. 工程力学, 2015, 32(3): 119-125,133. DOI: 10.6052/j.issn.1000-4750.2013.09.0874
引用本文: 丁阳, 陈晔, 师燕超. 室内爆炸超压荷载简化模型[J]. 工程力学, 2015, 32(3): 119-125,133. DOI: 10.6052/j.issn.1000-4750.2013.09.0874
DING Yang, CHEN Ye, SHI Yan-chao. SIMPLIFIED MODEL OF OVERPRESSURE LOADING CAUSED BY INTERNAL BLAST[J]. Engineering Mechanics, 2015, 32(3): 119-125,133. DOI: 10.6052/j.issn.1000-4750.2013.09.0874
Citation: DING Yang, CHEN Ye, SHI Yan-chao. SIMPLIFIED MODEL OF OVERPRESSURE LOADING CAUSED BY INTERNAL BLAST[J]. Engineering Mechanics, 2015, 32(3): 119-125,133. DOI: 10.6052/j.issn.1000-4750.2013.09.0874

室内爆炸超压荷载简化模型

SIMPLIFIED MODEL OF OVERPRESSURE LOADING CAUSED BY INTERNAL BLAST

  • 摘要: 美国UFC规范计算室内爆炸荷载时假设爆炸荷载在整个空间均匀分布,但由于壁面的限制作用,真实室内爆炸的压力场并不均匀。该文利用非线性显式动力分析程序AUTODYN的Remap技术对室内爆炸进行模拟,研究了壁面爆炸荷载的分布规律;依据壁面爆炸超压时程曲线特点及其峰值超压分布,对爆炸荷载作用区域进行划分,并提出了各区域爆炸荷载典型参数—峰值超压、冲击波作用时间、准静态峰值气体压力及吹降时间的计算式,建立了室内爆炸荷载简化模型,并进一步研究了爆源高度和房间尺寸对荷载简化模型的影响。结果表明:室内爆炸下壁面不同区域爆炸荷载的分布形式及计算方法不同,拟合得到了各区域爆炸荷载的简化计算式;爆源高度及房间尺寸对峰值超压影响较大,对冲击波冲量影响较小。

     

    Abstract: The UFC standard assumes a uniform pressure distribution for internal blasts. However, the actual pressure field is non-uniform due to the limiting effects of walls. In this paper, an internal blast is simulated using AUTODYN’s Remap tool, and the laws governing distribution of blast load on the wall surface are studied. Based on the characteristics of the overpressure time history and the distribution of peak overpressure, the areas subjected to blast load are divided, and formulas for calculating peak overpressure, shock wave duration, gas pressure, and blow-down time for each region are proposed. A simplified model for blast loading is established and the influence of explosion height and confinement geometry is analyzed. The results show that the load distribution and blast load computational method in each region are different and the empirical formulas evaluating the blast load in different regions are fitted. Explosion height and confinement geometry have a great influence on peak overpressure, but less on impulse.

     

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