选用混合浮法和钢化玻璃的双层和三层夹层玻璃,并采用单种SentryGlas@Plus (SGP)或混合SGP/聚乙烯醇缩丁醛(PVB)胶层,对5组15块冲击致损后的夹层玻璃板进行静载试验.通过分析试件的荷载-挠度关系,研究玻璃裂纹模态、胶层性能对夹层玻璃开裂后强度的影响.试验结果显示:底层玻璃的裂纹模态对夹层玻璃构件的承载方式起着决定性作用;相比于钢化玻璃,浮法玻璃能形成“更有利的碎片形状”,因而能形成更好的传力路径并显著影响夹层玻璃的开裂后强度;对于双层夹层玻璃,底层为浮法玻璃的开裂后强度比底层为钢化玻璃的开裂后强度高46.5%;对于三层夹层玻璃,采用混合SGP和PVB胶层时开裂后强度仅为采用双层SGP的37%;从破坏模式而言,前者破坏后出现中心贯穿,呈现不利的脆性破坏特征,而SGP/PVB混合夹层玻璃则增加了样本的延性,充分发挥了胶层的性能.
In this paper, different glass configurations using annealed glass (ANG) and fully tempered glass (FTG) as well as different interlayer combinations were introduced. Fifteen laminated glass (LG) panels in five groups cracked by impact were statically tested. Through analyzing the load-displacement relationship, the effects due to the crack pattern and interlayer type on the post-breakage performance were examined. The results show that the crack pattern of inner glass dominates the load bearing mechanism of LG. Compared to FTG, ANG can produce beneficial crack pattern and generate better load transferring path to retain greater strength. Compared to inner FTG, an increase of 46.5% in post-breakage strength can be found when using inner ANG. The static resistance of LG using hybrid SentryGlas@Plus (SGP)/polyvinyl butyral(PVB)is only 37% of that uses double SGP interlayers. However, the LG using double SGP interlayers has the failure mode of central penetration which presents brittle characteristics and is unfavorable in engineering practice. The LG using hybrid SGP/PVB shows greater ductility while the interlayer can fully function.
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