Cold Temperature Effects on the Impact Behaviour of Glued-Laminated Timber Beams

IF 5.1 2区 工程技术 Q1 ENGINEERING, MECHANICAL
Nicole Wight , Christian Viau , Patrick Heffernan
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Abstract

Engineered wood products, such as glued-laminated timber (glulam), have been and are continuously being utilized in the construction of tall timber buildings and notable landmark bridges. This infrastructure, particularly the latter, may be exposed to hazardous impact loads throughout their service life. As little research has been conducted on the impact behaviour of glulam beams under cold temperature conditions, there is a need to investigate the potential effects of impact loading on glulam structural elements at cold temperatures. This paper presents an experimental investigation aimed at understanding the effects of cold temperatures on the impact behaviour of glulam timber beams. Fifteen glulam beams were tested under quasi-static and impact loading, under ambient and cold temperatures. Drop weight impact testing was performed to simulate dynamic loading conditions similar to those experienced in real-world scenarios. The results indicate that both the loading regime and cold temperatures have a significant influence on the strength and stiffness of glulam beams, whereby statistically significant increases in the moduli of rupture and elasticity were observed, however, no interaction between the two variables occurred. A single-degree-of-freedom (SDOF) model was developed and validated using the experimental test results and found to provide good accuracy.
低温对胶合层压木梁冲击行为的影响
胶合层积材(胶合木)等工程木制品已经并将继续用于建造高大的木结构建筑和著名的地标性桥梁。这些基础设施,尤其是后者,在其整个使用寿命期间都可能面临危险的冲击载荷。由于对胶合梁在低温条件下的冲击行为研究甚少,因此有必要研究低温条件下冲击荷载对胶合结构构件的潜在影响。本文介绍了一项实验研究,旨在了解低温对胶合木梁冲击行为的影响。在环境温度和低温条件下,对 15 根胶合木梁进行了准静态和冲击载荷测试。通过落重冲击测试,模拟了与实际情况类似的动态加载条件。结果表明,加载制度和低温对胶合梁的强度和刚度都有显著影响,据统计,胶合梁的断裂模量和弹性模量都有显著增加,但这两个变量之间没有相互作用。利用实验测试结果开发并验证了单自由度(SDOF)模型,发现该模型具有良好的准确性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
International Journal of Impact Engineering
International Journal of Impact Engineering 工程技术-工程:机械
CiteScore
8.70
自引率
13.70%
发文量
241
审稿时长
52 days
期刊介绍: The International Journal of Impact Engineering, established in 1983 publishes original research findings related to the response of structures, components and materials subjected to impact, blast and high-rate loading. Areas relevant to the journal encompass the following general topics and those associated with them: -Behaviour and failure of structures and materials under impact and blast loading -Systems for protection and absorption of impact and blast loading -Terminal ballistics -Dynamic behaviour and failure of materials including plasticity and fracture -Stress waves -Structural crashworthiness -High-rate mechanical and forming processes -Impact, blast and high-rate loading/measurement techniques and their applications
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