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首页> 外文会议>Asia-Pacific Conference on Shock amp; Impact Loads on Structures; 20031112-14; Changsha, Hunan,(CN) >NUMERICAL SIMULATION OF SIMULTANEOUS GROUND SHOCK AND AIRBLAST PRESSURE ON NEARBY STRUCTURES FROM SURFACE DETONATION
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NUMERICAL SIMULATION OF SIMULTANEOUS GROUND SHOCK AND AIRBLAST PRESSURE ON NEARBY STRUCTURES FROM SURFACE DETONATION

机译：地表爆轰对邻近结构同时产生地面冲击和爆炸压力的数值模拟

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摘要

With the increased world tension, some structures might be a subject of terrorist bombing. Accurate analysis of the dynamic structural responses and damage to surface explosions is essential for safe and economic design and strengthening of such structures. Current practice in analyzing and design structures to withhold to surface explosions usually considers only the airblast pressures generated by explosions. In reality, a surface explosion generates both ground shock wave and airblast pressures. Because wave speeds in air and in the ground are different, the ground shock and airblast pressure will arrive at structures with a time lag. Depending on the distance of the explosion center to the structure, the time lag could be very small and therefore ground shock and airblast force will act on structures simultaneously. Simultaneous ground shock and airblast pressure on the structures might intensify the airblast pressure effect on structures. Thus, an accurate and reliable analysis of the structural responses to surface explosion load should consider simultaneous ground shock and airblast force. Unfortunately, information and data of simultaneous ground shock and airblast pressure loads on structures cannot be found in the literature. This paper presents numerically simulated ground shock and airblast pressures generated from surface explosions. The intensity and frequency content of both the airblast pressure and ground shock, their arriving time to the structure, as a function of the distance between the explosion center and the structure and charge weight. The pressure profile along the vertical direction is also analyzed to determine the variations of the airblast forces along the structure height. As the pressure distribution is usually assumed uniform along the structural height in current practice, this analysis will give some indication the errors of such assumption of the airblast loads on structures. The numerical results will be presented in terms of the scaled distance. They can be used for more accurate modeling of explosive loads in response and damage analysis of structures to surface explosions.
机译：随着世界紧张局势的加剧，某些建筑物可能成为恐怖主义爆炸的主题。准确分析动态结构响应和对表面爆炸的破坏，对于安全经济的设计和加固此类结构至关重要。当前在分析和设计结构以阻止地面爆炸时，通常只考虑爆炸产生的爆破压力。实际上，地表爆炸会产生地面冲击波和爆炸压力。由于空气和地面中的波速不同，因此，地面冲击力和空气冲击压力会滞后到达建筑物。根据爆炸中心到建筑物的距离，时滞可能非常小，因此，地面震动和冲击力会同时作用在建筑物上。同时在建筑物上施加地面震动和空气冲击压力可能会加剧空气冲击压力对结构的影响。因此，对表面爆炸载荷的结构响应进行准确而可靠的分析时，应考虑同时发生的地面冲击和冲击力。不幸的是，在文献中找不到同时发生的地面震动和冲击力的信息和数据。本文介绍了由表面爆炸产生的数值模拟的地面震动和爆破压力。爆炸压力和地面冲击的强度和频率含量，它们到达结构的时间，是爆炸中心与结构之间的距离和装药重量的函数。还分析了沿垂直方向的压力分布，以确定沿着结构高度的空气冲击力的变化。由于在当前实践中通常假定压力分布沿结构高度是均匀的，因此该分析将在某种程度上表明这种假设对结构上的爆破载荷的误差。数值结果将以比例距离表示。它们可用于对结构对表面爆炸的响应和损伤分析中的爆炸载荷更精确的建模。

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