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为研究点支式夹层玻璃幕墙的抗爆性能,完成了2种夹层玻璃厚度、TNT装药量从0.4～30 kg的共9组野外爆炸试验,研究了不同装药量下的超压响应、玻璃幕墙的位移响应和破坏模式。系列爆炸试验结果表明,爆炸发生后超压迅速升至峰值,并在几毫秒内衰减;夹层玻璃的位移响应随着TNT装药量的增加而增大,增加玻璃厚度可有效降低夹层玻璃的位移响应;点支式玻璃幕墙的破坏模式为PVB夹层在点支孔处撕裂从而导致玻璃面板破坏,此时钢化玻璃已碎成颗粒附着在PVB上,但不发生飞溅。同时,采用动力非线性有限元方法分析爆炸试验,有限元模拟获得的中心点最大位移与试验结果差别在35%内;有限元分析发现玻璃面板在点支孔处有明显的应力集中现象,从而导致点支孔处发生破坏,所得破坏模式与试验结果一致。
In order to study the antiknock performance of point-supported mezzanine glass curtain wall, two kinds of sandwich glass thickness were completed. Nine groups of field explosion tests with TNT dosage ranging from 0.4 to 30 kg were carried out to study the overpressure response under different charges, Displacement response and failure mode of glass curtain wall. The results of the series of explosion tests showed that the overpressure rapidly rose to its peak after the explosion and declined within a few milliseconds. The displacement response of laminated glass increased with the increase of TNT charge. Increasing the thickness of glass could effectively reduce the displacement of laminated glass Response; point-supported glass curtain wall failure mode for the PVB interlayer tear at the point branch hole resulting in glass panel damage, this time the glass has been broken into particles attached to the PVB, but no spatter. At the same time, the dynamic nonlinear finite element method is used to analyze the explosion test. The maximum displacement of the center point obtained by finite element simulation is within 35% of the experimental result. Finite element analysis shows that the glass panel has obvious stress concentration at the point branch hole, As a result, damage occurs at the point branch hole and the resulting failure mode is consistent with the test result.