Abstract
Antiknock research of reinforced concrete (RC) slabs is often carried out with spherical or nearly spherical explosives, although many explosives used in engineering and military are cylinder shaped. It is known that the shock wave caused by cylindrical explosives varies in different directions, which is quite different from the spherical charge. In this paper, the shock wave propagation characteristics of spherical and cylindrical explosives with different aspect ratios are compared and analyzed. The 2D numerical results show the peak overpressure from the cylindrical explosive is significantly affected by the L/D (length/diameter) ratio. Subsequently, the damage features of RC slabs under spherical and cylindrical explosives with a certain L/D ratio are investigated through an explosion experiment. Finally, the influence of the L/D ratio on the dynamic response of RC slabs under cylindrical explosives is studied by the fully coupled Euler–Lagrange method. The accuracy and reliability of the coupled model are verified by comparing the numerical with experimental results. Based on the experimental and numerical studies, it can be concluded that the explosive shape directly determines the shape of upper surface crater damage, and the spall damage area of RC slabs becomes larger as the L/D increases. For the L/D increases to a certain value, the cylindrical explosive will induce larger spall damage than that induced by spherical charge with the same amount of explosives. Hence, the effect of the cylindrical charge should be considered in the antiknock design of the RC structure.
Highlights
Antiknock research of reinforced concrete (RC) slabs is often carried out with spherical or nearly spherical explosives, many explosives used in engineering and military are cylinder shaped
Some researchers [6, 13, 14] have found that the L/D ratio has a great influence on the blast wave induced by cylindrical explosives, few equations have been given to explain this effect
One equation [15] does take into account the L/D to predict the shock wave overpressure induced by cylindrical charges, but this formula is only applicable to the axial direction of cylindrical explosives
Summary
Xiaohua Zhao ,1,2,3 Gaohui Wang ,4 Hongyuan Fang, Yong Fan ,3 and Xueming Du 1,2. Antiknock research of reinforced concrete (RC) slabs is often carried out with spherical or nearly spherical explosives, many explosives used in engineering and military are cylinder shaped. Researches on the dynamic responses and damage characteristics of concrete slabs subjected to contact blasting loads mainly focused on cylindrical explosives with L/D being 1/1 [17,18,19,20] or 1/2 [21,22,23], which are nearly spherical explosives [24]. Using the verified numerical model, the damage features and dynamic response of the RC slab under spherical and cylindrical explosives with different L/D ratios are compared and discussed. A two-dimensional model is employed to investigate the shock wave propagation characteristics and peak overpressure induced by cylindrical explosives with different L/D ratios and compared with spherical explosives. In order to analyze the influence of aspect ratio on the shock wave propagation induced by the cylindrical explosive, a free field air explosion is simulated based on the 2D model. Target points 1–7 are all arranged along the radial direction of the cylindrical explosive, target points 8–14 are all arranged in the 45° direction, and target points 15–21 are all
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