Experimental Study on Thermal Breakage of Four-Point Fixed Glass Façade

Yu Wang, Qingsong Wang, G. Shao, Haodong Chen, Yanfei Su, Jinhua Sun, Linghui He, J. Wen, R. Zong, K. Liew
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引用次数: 19

Abstract

As the weakest part of building facades, glass panels can easily break in fires and change the compartment fire dynamics by creating new openings for air to enter. A series of full scale tests were conducted to investigate the thermal breakage and fallout of four-point fixed glass facades, in which glass panes of 1200 × 1200 × 6 (mm 3 ) were placed at 35, 45, 50 and 70 (cm) away from n-heptane pool fires on a 500 × 500 (mm 2 ) square pan. Both float and toughened glasses were investigated. The glass surface temperature, gas temperature at the centre of the exposed side and heat release rate were measured and analyzed. The cracking patterns and glass fallout processes were recorded by digital camera. It is found that all the cracks initiated from the fixed point and their intersections formed islands to cause glass pieces fallout when the exposed side reached around 200-300 °C for the float glasses tested. The fallout fractions suggest that once the first crack is initiated, the point-supported glass panes are much more easily to fallout than edge covered glasses. The toughened glass panes were found to be softened by the fire and bent, but they did not crack even when the fire directly impinged on them.
四点固定玻璃幕墙热破碎实验研究
作为建筑外墙最薄弱的部分,玻璃面板很容易在火灾中破裂,并通过为空气进入创造新的开口来改变隔间的火灾动态。为了研究四点固定玻璃幕墙的热破坏和沉降,进行了一系列全尺寸试验,其中1200 × 1200 × 6 (mm 3)的玻璃板放置在距离正庚烷池火35、45、50和70 (cm)的地方,并放置在500 × 500 (mm 2)的方形平底锅上。对浮法玻璃和钢化玻璃进行了研究。测量并分析了玻璃表面温度、暴露侧中心温度和放热率。用数码相机记录了玻璃的破裂模式和玻璃沉降过程。实验发现,当浮法玻璃暴露面温度达到200 ~ 300℃左右时,所有的裂纹都是从固定点开始的,它们的交叉处形成孤岛,导致玻璃碎片沉降。放射性尘埃分数表明,一旦第一次裂缝开始,点支承玻璃板比边缘覆盖玻璃更容易产生放射性尘埃。钢化玻璃板被火软化并弯曲,但即使火直接撞击它们也没有破裂。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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