热荷载与风荷载作用下点式支承玻璃的破裂行为规律

在高层建筑火灾中,玻璃幕墙的破裂受到环境风和室内火灾的共同影响。研究了600 mm×600 mm×6mm的浮法玻璃幕墙在点支承安装方式下受到热辐射荷载和风荷载情况下的响应规律。分析了不同工况下玻璃表面的温度变化、风荷载的大小与玻璃破裂时间的关系、玻璃破裂与温差之间的关系、玻璃裂纹扩展及其与风速之间的关系。结果表明在玻璃两侧分别受到热辐射和风荷载共同作用时,风荷载的增加会加速玻璃的破裂。研究结果可为玻璃幕墙的工程应用提供技术支撑。

Breakage of float glass with four-point supported under the combined effect of thermal loading and wind loading

The glass breakage behavior is significantly affected by the compartment fire and environmental wind in high-rise building fire. In this work, the four-point supported glass panes, with a dimension of 600 mm× 600 mm× 6 mm, are employed in experiments to study the glass breakage behavior. The glass breaking time, crack initiation and propagation are obtained, and the temperature difference on the glass is calculated. The wind load significantly affects the response characteristics of glass breakage: When glass fa?ade is under the combined effect of wind loading and thermal loading, the wind load can accelerate the glass fracture. The results provide useful knowledge for the fire protection of glass fa?ades.