Respondek Zbigniew
Faculty of Civil Engineering, Czestochowa University of Technology, Dąbrowskiego 69, 42-201 Częstochowa, Poland.
Materials (Basel). 2024 Sep 23;17(18):4669. doi: 10.3390/ma17184669.
Insulating glass units (IGUs) are the most common filling for external building envelopes. These elements have many advantages related to the thermal protection of buildings. However, some climatic loads are generated or modified due to the sealed gas cavity between the glass panes. The gas enclosed in the cavities changes its parameters under external load, which affects the operational deflection and stress in an IGU. In most computational models describing this phenomenon, the component panes are assumed to be simply supported on the edge spacer, which is considered a sufficient approximation. This article, which continues previous work, assumes that the component glass panes can be supported elastically at the edges. The parameter describing this connection is rotational stiffness. Based on the theory of linear-elastic plates, coefficients were determined to calculate the change in cavity volume, deflection, and stress in glass panes. Then, the results of calculations of the influence of rotational stiffness and static values in exemplary IGUs of various structures, loaded with changes in atmospheric pressure and wind, are presented. It was found that a feedback loop occurs here. The deflection and stress in elastically supported single panes are lower than in the case of those simply supported. However, the lower susceptibility to deflection of the component panes weakens the gas interaction in the cavity, and the resultant load on these panes increases. The influence of rotational stiffness on the resulting static values may therefore vary. In the analyzed examples, this influence was primarily negative for symmetrical loads and clearly positive for wind loads.
中空玻璃单元（IGU）是建筑外墙最常用的填充材料。这些部件在建筑物的热保护方面具有许多优势。然而，由于玻璃板之间的密封气腔，会产生或改变一些气候负荷。气腔内封闭的气体在外部负荷作用下会改变其参数，这会影响中空玻璃单元的运行挠度和应力。在描述这种现象的大多数计算模型中，组成玻璃板被假定为简单支撑在边缘间隔条上，这被认为是一种足够的近似。本文延续之前的工作，假定组成玻璃板可以在边缘处弹性支撑。描述这种连接的参数是转动刚度。基于线弹性板理论，确定了计算气腔体积变化、玻璃板挠度和应力的系数。然后，给出了在各种结构的典型中空玻璃单元中，在大气压力和风力变化作用下，转动刚度和静态值影响的计算结果。结果发现这里存在一个反馈回路。弹性支撑的单块玻璃板的挠度和应力低于简单支撑的情况。然而，组成玻璃板较低的挠度敏感性削弱了气腔内的气体相互作用，并且这些玻璃板上的合成负荷增加。因此，转动刚度对合成静态值的影响可能会有所不同。在分析的示例中，这种影响对于对称负荷主要是负面的，而对于风力负荷则明显是正面的。
