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Strength grading of sawn timber in Europe: an explanation for engineers and researchers.

机译:欧洲锯材强度分级:对工程师和研究人员的解释。

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摘要

This paper is a concise explanation of the normative background to strength grading in Europe, addressing important aspects that are commonly misunderstood by structural engineers and timber researchers. It also highlights changes that are being made to the standards to: incorporate requirements of the construction products regulations; add improvements to the system to accommodate the latest knowledge and technology; and widen the application of the standards. Where designs need to be optimised, there is an opportunity to use the system more intelligently, in combination with the latest technology, to better fit design values to the true properties of the timber resource. This can bring a design enhancement equivalent to effort improving other aspects of the structure, such as connectors and reinforcement. Parallel to this, researchers working on other aspects of structural improvement need to understand what grades really mean in respect of the properties of the timber, in order to correctly analyse the results of testing. It is also useful to know how techniques used in grading can assist with material properties characterisation for research. The amount of destructive testing involved in establishing machine grading settings and visual grading assignments presents a barrier to greater use of local timber, and diversification of commercial species, so it is important that any researcher assessing the properties of such species should consider, from the outset, doing the research in a way that can contribute to a grading dataset at a later date. This paper provides an overview of what is required for this.
机译:本文是对欧洲强度等级规范背景的简要说明,重点介绍了结构工程师和木材研究人员通常误解的重要方面。它还强调了对标准的更改,这些更改包括:纳入建筑产品法规的要求;对系统进行改进以适应最新的知识和技术;并扩大标准的适用范围。在需要优化设计的地方,有机会结合最新技术更智能地使用该系统,以使设计价值更适合木材资源的真实属性。这可以带来等同于努力改善结构其他方面(例如连接器和加固)的设计增强。与此平行的是,研究人员在结构改进的其他方面进行工作时,需要了解等级对木材性能的真正含义,以便正确地分析测试结果。了解分级中使用的技术如何有助于研究的材料特性表征也很有用。建立机器等级设置和目视等级分配所涉及的破坏性测试数量为当地木材的大量使用和商业物种的多样化提供了障碍,因此,评估此类物种特性的任何研究人员从一开始就应该考虑这一点很重要。 ,以一种可以为以后的评分数据集做出贡献的方式进行研究。本文提供了对此要求的概述。

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