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采用JH-2模型,将有限元方法与薄板振动理论相结合,研究了建筑玻璃在爆炸冲击波作用下的破碎原因、破碎模式、碎片分布规律。结果表明,玻璃在爆炸荷载下破碎的主要原因为静水压力达到其材料的静水拉应力强度。根据第1阶、第2阶振幅的比值,玻璃的爆炸响应分两个阶段。对应玻璃在不同响应阶段破碎,玻璃破碎模式分为两种:模式1,玻璃四角与板心连线上呈对称分布的四点最先破坏,裂缝沿该四点的连线发展、贯通,玻璃被分隔成9块;模式2,板心处玻璃最先破坏,裂缝向四边发展、贯通,将玻璃板分成4块。玻璃的破碎模式与爆炸荷载及玻璃尺寸相关,根据玻璃板位移在板心处首次有极大值的时间及该时间玻璃静水压力极大值可初步判定玻璃在爆炸荷载下的破碎模式。
Using JH-2 model, the finite element method is combined with the theory of thin plate vibration to study the cause of crushing, breaking mode and fragment distribution of building glass under blast shock wave. The results show that the main reason for the glass breaking under the explosive load is the hydrostatic tensile strength of the material reached its hydrostatic tensile stress. According to the ratio of the first order and the second order of amplitude, the glass’s explosive response is divided into two stages. Corresponding glass is broken at different response stages, and the glass breaking mode is divided into two modes: mode 1, four points symmetrically distributed on the four corners of the glass and the board heart are destroyed first, and the crack develops along the connection of the four points, Is divided into 9; pattern 2, the heart of the glass at the first Department of glass damage, the development of cracks to the four sides, through, the glass is divided into four. The glass breaking mode is related to the blast load and the glass size. According to the first time when the glass plate displacement is at the core of the plate and the maximum hydrostatic pressure of the glass at that time, the breaking mode of the glass under the explosive load can be preliminarily determined.