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Reinforced glass beams; Effect of increased temperatures on the glass-to-reinforcement adhesive bond

机译：强化玻璃梁;温度升高对玻璃与增强胶粘剂粘合的影响

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For several years the Glass & Transparency research group at Delft University of Technologyhas been working on safety concepts for glass structures and structural glass components. Incontrast with common ‘safety' approaches, the developed safety concepts do not rely onoverdimensioning, but aim at controlled and ductile failure behaviour. Since glass itself is abrittle material, the research group focuses on the development of glass-composite concepts inwhich the ductility is obtained by a combined action of glass and a ductile material [1].One of the concepts currently under investigation is the ‘reinforced glass beam' concept [2].This concept makes use of a stainless steel reinforcement, which is adhesively bonded to theedge of an annealed float glass beam. Similar to reinforced concrete this reinforcement sectionwill act as a crack bridge, taking up the tensile forces once the glass has cracked due tounforeseen circumstances. The reinforcement section will provide redundancy to the system; thetensile forces will be taken up by the reinforcement while the compressive forces will be takenup by the uncracked compression zone. This way safe and ductile failure behaviour is obtained.An important aspect of the reinforced glass beam concept is the adherence of thereinforcement to the glass. Since all interaction between glass and reinforcement is dependent onthis adhesive bond, it has to service under all conditions. A very important condition is anincreased serviceability temperature, since e.g. glass roofs are often exposed to direct sunlightradiation. The effect of increased temperatures on the adhesive bond has been investigated incooperation with glass-researchers at Ghent University. For this research a climatic room atGhent University has been equipped with a 4-point bending test setup. A total of thirty 1.5 mreinforced glass beam specimens have been stored for at least 24 hours at 60°C, before beingtested in 4-point bending at this same temperature level. Using this method, six differentadhesives have been investigated. Results show the acrylic specimens performed best.
机译：多年来，代尔夫特理工大学的玻璃与透明性研究小组 一直在研究玻璃结构和玻璃结构部件的安全概念。在 与常见的“安全”方法相反，已开发的安全概念不依赖 尺寸过大，但旨在控制和延展性失效行为。由于玻璃本身是一种 该研究小组致力于研究脆性材料的发展， 延展性是通过玻璃和延性材料的共同作用而获得的[1]。 目前正在研究的概念之一是“强化玻璃梁”概念[2]。 这个概念利用了不锈钢增强材料，该材料与 浮法玻璃梁的边缘。与钢筋混凝土类似，此钢筋部分 将充当裂缝的桥梁，一旦玻璃破裂，其将吸收拉力 不可预见的情况。加强部分将为系统提供冗余;这 拉力将由钢筋吸收，而压力将由钢筋吸收 由无裂隙的压缩区域向上移动。这样就获得了安全和延性的失效行为。 强化玻璃梁概念的一个重要方面是遵守 加固玻璃。由于玻璃和增强材料之间的所有相互作用都取决于 这种胶粘剂必须在所有条件下使用。一个非常重要的条件是 由于例如提高了使用温度玻璃屋顶经常暴露在直射阳光下 辐射。已经研究了温度升高对粘合剂粘结的影响。 与根特大学的玻璃研究人员合作。为了进行这项研究， 根特大学已配备了4点弯曲测试装置。总共三十个1.5 m 加固玻璃梁样品在60°C下已保存了至少24小时，然后再进行 在相同温度水平下进行4点弯曲测试。使用此方法，六个不同 胶粘剂已被研究。结果显示丙烯酸样品表现最佳。

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