四边支承贴膜玻璃受弯承载性能分析

Analysis of flexural bearing performance of filmed glass supported on four sides

贴膜是防止非安全玻璃或钢化玻璃破裂后瞬时脱落的手段之一,为及时安全隔离并为维修提供时间,贴膜玻璃受弯承载性能研究对于贴膜玻璃的工程应用具有重要指导意义。文章基于有限元模拟计算和抗风压试验测试分析对四边支承贴膜玻璃受弯承载性能进行了分析。结果表明:膜层厚度不同时,玻璃贴膜前后挠度减小不明显,而贴膜后玻璃第一主应力减小约50%;在1、2、3和4 kPa均布风荷载作用下,挠度随着荷载值增加近似成线性变化,贴膜面正压挠度变形比负压挠度变形略大;挠度与均布荷载值呈近似线性趋势,随着均布荷载值增加,挠度测试值呈"先大于计算值,后小于计算值"的趋势,说明了模拟计算结果更为保守,修正后的模拟值与测试值更为接近。

The film is one of the methods to prevent non-safety glass or toughened glass instantaneous shedding after being broken off, which can provide enough time for security isolation measures and maintenance. Flexural performance research of filmed glass has an important guiding significance for the engineering application. Deformation along z axis direction and the first principal stress value of glass and filmed glass under 1, 2, 3, 4 and 5 kPa uniformly distributed load are studied based on finite element simulation method. The results show that z axial deformation is not obvious for glass and filmed glass with different thickness film layer and first principal stress is reduced by about 50% after being filmed, z axis deformation with load change is approximately a linear change under 1,2, 3 and 4 kPa, and deflection deformation of filmed glass under positive pressure is slightly larger than that of negative pressure. Comparisons of simulation and test show that z axis deformation is approximately a linear trend with uniformly distributed load value, and test values of z axis deformation are higher than those of the calculated and then less than the calculated with uniformly distributed load increasing, indicating that the simulation results are more conservative and the modified simulation values are close to the tested ones.