安装方式对浮法玻璃热破裂行为影响

Study on influence of installation method on thermal cracking behavior of float glass

为研究浮法玻璃在建筑火灾发展过程中,不同安装方式对其破裂行为的影响,以尺寸为600 mm×600 mm×6 mm的浮法玻璃为研究对象,分别采用点支撑、框支撑(4边遮蔽、左右遮蔽、上下遮蔽)和无遮蔽5种安装方式,分析不同安装方式下的浮法玻璃在热载荷作用下的破裂行为,得到浮法玻璃的首次破裂时间、玻璃表面温度及空气温度、裂纹起裂位置和裂纹扩展行为等特征参数。研究结果表明:在热载荷作用下,选用无遮蔽安装方式的浮法玻璃在试验中未发生破裂,其防火性能最好;而选用点支撑安装方式的浮法玻璃首次破裂时间最短,其裂纹以直裂纹为主,且起裂位置发生在玻璃的支撑点处,其防火性能最差。

In order to study influence of different installation methods on cracking behavior of float glass in the process of building fire development.Taking float glass with size of 600 mm × 600 mm × 6 mm as research object.Five installation modes were adopted,such as point support,frame support(4 side shielding,left and right shielding,upper and lower shielding) and no shielding,crack behavior of float glass under different installation modes under thermal load was analyzed,characteristic parameters such as the first crack time,glass surface temperature and air temperature,crack initiation position and crack propagation behavior of float glass were obtained.The result shows that float glass with non-masking installation mode does not crack under thermal loads,and its fireproof performance is the best.The first crack time of float glass installed with point support is the shortest,cracks are mainly straight cracks,and crack initiation position occurs at the support point of glass,and its fire resistance is the worst.