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为研究单层索网点支玻璃幕墙中所常用的单层和中空钢化玻璃在火灾下的受力性能以及破坏机理,对5组钢化玻璃进行了相同火灾条件下的负载试验研究。试验重点考察了玻璃的破坏模式、玻璃破坏时的变形挠度、玻璃破坏时间、破坏时的临界温度以及试验过程中玻璃的位移发展情况等,并在试验基础之上进行了玻璃面板在火灾高温下的破坏机理分析。研究结果表明:火灾高温条件下玻璃由于受热膨胀不均匀在表面产生的拉应力是其破坏的主要原因;单层钢化玻璃的破坏临界温度为520℃左右,而中空玻璃面板为450~550℃;玻璃面板承受的均布荷载将在玻璃内部产生荷载应力,并导致其面外变形增大。
In order to study the stress performance and failure mechanism of single-layer and hollow tempered glass commonly used in point-supported glass curtain wall of single-layer cable net, five groups of tempered glass were tested under the same fire conditions. The test focuses on the failure modes of glass, deformation deflection when glass is damaged, glass failure time, the critical temperature at failure and the development of glass displacement during the test. Based on the test, Analysis of the destruction mechanism. The results show that the tensile stress on the surface of the glass due to the uneven thermal expansion is the main reason for the damage. The critical temperature of failure of the single-layer toughened glass is about 520 ℃, while the thickness of the insulating glass is 450 ~ 550 ℃. Uniform load on the glass panel will generate load stress inside the glass and lead to increased out-of-plane deformation.