幕墙中空玻璃内外片风荷载分配比例研究

Study on wind load sharing ratio of inner and outer panels of curtain wall insulating glass

中空玻璃在我国建筑幕墙中广泛使用,但关于中空玻璃内外片风荷载分配比例的研究不充分,规范相应规定有待进一步完善。首先归纳总结了中空玻璃分荷比例的影响要素,对比分析了中、欧相关规范的优劣异同。基于内外面板挠度位移场与理想气体方程所得的中空层气体体积变化量相同的原理,建立了适用于框支式和点支式的高精度中空玻璃承载力计算模型,并进行了中空玻璃内、外面板分荷比例的参数化分析,计算结果与欧盟规范结果吻合良好。最后,针对主流面板厚度的框支式中空玻璃,考虑中空层厚度、面板大小、长宽比等影响因素,通过最小二乘法曲面拟合得到了适用于不同情况的中空层系数计算公式。

Insulating glass is widely used in building curtain walls in China,but the research on the wind load sharing ratio of inner and outer panels of insulating glass is insufficient,and the corresponding provisions of the specification need to be further improved.Firstly,the influencing factors of the load sharing ratio of insulating glass was summarized,and the advantages and disadvantages of relevant codes between China and Europe were compared.Based on the principle that the deflection displacement field of the inner and outer panels is the same as the gas volume change of the hollow layer obtained by the ideal gas equation,a high⁃precision bearing capacity calculation model for frame supported and point supported insulating glass was established,and the parametric analysis of the load sharing ratio of insulting glass was carried out.The calculation results are in good agreement with the results of the EU Code.Finally,for the frame supported insulating glass with mainstream panel thickness,considering the influencing factors such as airspace thickness,panel size and aspect ratio,formulas for calculating the coefficients of the airspace applicable to different scenarios were derived based on the method of least squares curve fitting.