真空玻璃的应力分析及强度设计

基于真空玻璃的典型结构特征,分析了大气压差、温差及风载荷作用下真空玻璃的应力分布特征,给出了最大弯曲拉应力定量计算公式。基于结构抗力设计方法,分析了长期和短期应力协同作用下真空玻璃的承载性能设计。结果表明,在给定基片厚度情况下,随着支撑物间距的增大,真空玻璃最大弯曲拉应力呈近似线性增长,在支撑物间距不变情况下,真空玻璃最大弯曲拉应力随基片厚度增大呈指数式下降趋势。温差引起的最大弯曲拉应力与玻璃基片厚度及长宽尺寸无关,但与膨胀系数有关,温差值与其引发的真空玻璃最大弯曲拉应力呈线性关系。相同条件下,真空玻璃抗风压性能弱于与其等厚度的单片玻璃。在长期和短期应力协同作用下,宜分别计算不同应力作用时间下真空玻璃的效应设计值进行校核。

Stress Analysis and Strength Design of Vacuum Glazing

The stress distribution characteristic of vacuum glazing due to atmospheric pressure difference, temperature difference and wind load were analyzed according to its typical structure characteristics, and the quantitative calculation formulas of the maximum bending tensile stress were given in this work. The bearing capacity design of vacuum glazing under synergetic effect of long-term and short-term stress was analyzed based on the structural resistance design method. The results show that under the condition of given substrate thickness, the maximum bending tensile stress of vacuum glazing basically increases linearly with the increase of the support spacing. With a given support spacing, the maximum bending tensile stress of vacuum glazing decreases exponentially with the increase of the substrate thickness. The maximum bending tensile stress due to temperature difference is not related to the thickness, length and width of the glass substrate, but related to the expansion coefficient.There is a linear relationship between the temperature difference and the maximum bending tensile stress of vacuum glazing. Under the same conditions, the wind pressure resistance of vacuum glazing is not as good as that of plate glass with equal thickness.Under the synergetic effect of long-term and short-term stress, the design value of vacuum glazing effect under different stress action time should be calculated separately for verification.