College of Civil Engineering and Architecture, Guangxi University, Nanning, China.
Key Laboratory of Disaster Prevention and Structure Safety of Chinese Ministry of Education, Nanning, China.
PLoS One. 2021 Apr 23;16(4):e0250463. doi: 10.1371/journal.pone.0250463. eCollection 2021.
Cold bending is a characteristic of significance for the beautiful curved glass curtain walls, because it affects them in terms of energy-efficiency and cost-efficiency. The increasing engineering projects call for more special studies on the mechanical properties of cold-bent glass panels, especially when the walls are built by insulating glass that is currently widely used while its relevant research is very scarce. This paper is devoted to studying the mechanical properties of anticlastic cold-bent insulating glass while taking different factors into consideration, including glass thickness, cold-bent torsion rate and cavity thickness. 9 pieces of insulating glass were manufactured for anticlastic cold-bending test and their coupled effect with identical load is also studied, and numerical finite element analysis sessions were carried out to simulate the experimental results for each one of them. Further, we analyzed the stress distribution performance of the sample pieces under cold bending and a uniform load, followed by discussions about stress transfer controls in glass plates. The results showed that the cold-bent control stress is on the surface with direct loads from cold bending and close to the cold-bent corner on the short edge, and it is transferred from the parts around the corner to the center when the uniform load plays a leading role in generating stress. This transfer could occur under a relatively small load with a small cold-bent torsion rate. A higher cold-bent torsion rate in cold bending contributed mostly to greater center stress in the glass, and as the glass thickness grows, stress and deflection at the plate center would significantly drop. However, the effect of cavity thickness on the anticlastic mechanical response of insulating glass was found to be trivial.
冷弯是美丽的曲面玻璃幕墙的一个重要特征，因为它会影响到它们的节能和成本效益。越来越多的工程项目需要对冷弯玻璃面板的力学性能进行更多的特殊研究，尤其是在广泛使用的隔热玻璃墙的情况下，而相关的研究却非常缺乏。本文致力于研究抗凹冷弯隔热玻璃的力学性能，同时考虑了玻璃厚度、冷弯扭转率和空腔厚度等不同因素。制作了 9 块隔热玻璃进行抗凹冷弯试验，并研究了它们在相同载荷下的耦合效应，还对每一块玻璃进行了数值有限元分析模拟实验结果。此外，我们分析了样品在冷弯和均布载荷下的应力分布性能，并讨论了玻璃板中应力传递的控制。结果表明，冷弯控制应力位于受直接冷弯载荷的表面，靠近短边的冷弯角，当均布载荷在产生应力方面起主导作用时，它从角周围的部分传递到中心。这种传递可以在较小的冷弯扭转率和较小的载荷下发生。较大的冷弯扭转率主要导致玻璃中心的应力增大，随着玻璃厚度的增加，板中心的应力和挠度会显著下降。然而，空腔厚度对隔热玻璃的抗凹力学响应的影响微不足道。
