王青松*,陈昊东，张毅，孙金华

（中国科学技术大学火灾科学国家重点实验室，合肥 230026）

　　摘要：玻璃在火场高温作用下会产生裂纹，裂纹汇合形成“孤岛”,在外界扰动增加和自身约束减少致使“孤岛”脱落，从而破坏玻璃构件的整体性，使其丧失使用功能。玻璃脱落形成新的通风口，新鲜气流的流入会加速火灾的发展，脱落的玻璃碎片也为救援带来困难。因此，研究热荷载作用下玻璃破裂行为具有重要的意义。本文研究了尺寸为600mm×600mm×6mm的Low-E玻璃在升温速率分别为5℃/min、10℃/min、15℃/min、20℃/min 和 25℃/min条件下的热破裂行为。热辐射源距玻璃500mm.实验结果表明玻璃首次破裂位置主要分布在玻璃上部中心点附近；首次破裂时间随着热辐射源升温速率的增加而减小，首次破裂时刻向火面与背火面中心点温度和温差、向火面中心点同破裂位置背火面遮蔽点之间的平均温差均随着热辐射源升温速率的增加而不断增大，并在升温速率为 15℃/min时达到最大，然后降低。

　　关键词：Low-E玻璃，热荷载，实验，破裂行为

 Experimental study of Breakage Behavior of Low-E Glass Under Thermal Loading
Wang Qingsong^*，Chen Haodong^*，Sun Jinhua^*
*( State Key Laboratory of Fire Science，University of Science and Technology of China，Hefei 230026，China )

　　Abstract:In a fire scenario, glass will crack and cracks join to form island, which will damage the integrity of the glass component and lead to loss of function. Separated glass pieces fall off from the glass pane due to the increasing external disturbances and decreasing constraints from the frame, which will not only accelerate the fire growth, but also bring more difficulty for the rescue. Therefore, it has an important significance to study breakage behavior of glass under thermal loading. Low-E glasses are widely used in the glass curtain wall and were chosen as experimental materials in this paper. The size of glass is 600 mm × 600 mm × 6 mm. The heating rates of radiation source are 5 °C min?1, 10 °C min?1, 15 °C min?1, 20 °C min?1, and 25 °C min?1, respectively. The distance between radiation source and the glass is 500 mm. The experimental results show that time to first crack decreases as the heating rate increases. The center temperature of the exposed side and ambient side of glass, the center temperature difference between the exposed side and ambient side, and the average temperature difference between the center of exposed side and fracture position of ambient shaded side increase firstly and then decrease as the heating rate increases and reach the maximum under the heating rate of 15 °C min?1 when first fracture occurs. The first breakage positions of glass are mainly distributed in the nearby upper center.

　　Key words: Low-E glass, Thermal loading, Experiments, Breakage behavior

　　联系方式

　　王青松：pinew@ustc.edu.cn