点支式钢化玻璃火灾下受力性能试验研究

发布时间：2018-10-31 06:44

【摘要】：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。
[Abstract]:In order to study the rupture process of point-supported monolithic, hollow and glass-toughened glass in the middle of single-layer cable dot-supported glass curtain wall under fire, the point-supported monoliths were used respectively. Three groups of open-hole toughened glass, such as hollow and glue, were tested under the same fire conditions. The development of glass displacement with temperature, the failure mode and time of glass, and the rupture process of glass were investigated. By comparing the test data with the same type of non-perforated glass, the effect of corner opening on the mechanical properties and rupture process of toughened glass under fire was studied. The results show that the tensile stress on the surface of glass due to thermal expansion is the main reason for its failure, and the uniform load on the glass panel will produce the load stress inside the glass, which will result in the increase of the out-of-plane deformation. A large number of micro-cracks are formed at the edge of the hole in the four corners of the glass, which results in the decrease of the strength and stress concentration of the material in the hole edge of the glass panel, which intensifies the destruction of the glass. The constraint of the fixed support of the point-supported glass panel limits the deformation of the four sides and accelerates the increase of the displacement of the central point.
【作者单位】：北京航空航天大学交通科学与工程学院;北京工业大学建筑工程学院;
【基金】：国家自然科学基金项目(51208019)
【分类号】：TU352.5

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