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为研究单层索网点支式玻璃幕墙中点支式单片、中空和夹胶钢化玻璃在火灾下的破裂过程,分别对点支式单片、中空和夹胶等3组开孔钢化玻璃进行了相同火灾条件下的负载试验研究。重点考察试验过程中玻璃位移随温度的发展情况、玻璃的破坏模式和破坏时间,以及其破裂过程等。通过将试验数据与相同类型的不开孔玻璃进行对比,研究了角部开孔对钢化玻璃在火灾下受力性能和破裂过程的影响。结果表明:火灾下,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;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;玻璃开孔,使其在四角点孔洞边缘形成大量微裂纹,造成玻璃面板孔边材料强度下降和应力集中,加剧了玻璃的破坏;点支式玻璃面板的固定支座约束限制了四边变形,加快了其中心点位移的增长。
In order to study the rupture process of mid-point monolithic, hollow and laminated glass in monolayer cable net point-supported glass curtain wall under fire, three groups of perforated tempered glass Under the same fire load test study. Focus on the process of testing the glass displacement with the development of temperature, glass failure mode and failure time, and its rupture process. By comparing the experimental data with the same type of non-porous glass, the influence of the corner opening on the stress performance and the rupture process of tempered glass in fire was studied. The results show that under the fire, the tensile stress on the surface of the glass due to the uneven thermal expansion is the main reason for its failure. The uniform load on the glass panel will cause the load stress in the glass and increase the out-of-plane deformation. The opening of the hole makes it form a large number of micro-cracks in the edge of the four corners of the hole, resulting in the strength reduction and stress concentration on the edge of the glass panel, which aggravates the destruction of the glass. The restraint of the fixed support of the point supported glass panel limits the deformation of the four sides and accelerates Its center point of displacement growth.