Advancing Design Provisions for Lateral Stability of Wood Built-up Beams

改进木组合梁横向稳定性的设计规定

• 批准号: 556167-2020
• 负责人: Doudak, GhasanG
• 金额: $ 2.08万
• 依托单位: University of Ottawa
• 依托单位国家: 加拿大
• 项目类别: Alliance Grants
• 财政年份: 2022
• 资助国家: 加拿大
• 起止时间: 2022-01-01 至 2023-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=749192
• 关键词: Advancing; Design; Provisions; Lateral; Stability

The proposed research project will address a long-standing technical issue related to the stability of built-up beams in wood construction. Built-up beams are formed by connecting two or more pieces of lumber vertically through mechanical fasteners (e.g., nails, screws, etc.). Research efforts are needed to address the design challenges and uncertainties associated with built-up beams. The lateral stability of a built-up beam is largely affected by the slip between individual plies. The design standard in Canada specifies the requirement for the design of built-up beams, however the effect of the connection slip between the lamination is not quantified. This could lead to either and overly conservative or unsafe design. The proposed research project aims to provide specific guidance on the lateral stability of built-up beams in the CSA O86 Standard by investigating the composite action of fasteners. This includes establishing design criteria under which full composite action is achieved, and formulating expressions that would reduce the critical moment capacity when only partial composite action is attained. After the completion of the project, the research outcome will be disseminated to the education, design and construction communities through publications and outreach programs. The project is expected to have a significant impact on the wood industry in that the research results, once successfully adopted by the CSA O86 Standard, would streamline the design process by reducing the uncertainties currently experienced by engineers when specifying built-up beams. By addressing the aspects related to design, cost and safety, built-up beams would become more reliable and economical for use in wood construction. Since built-up beams can be sourced from either traditional sawn lumber or new materials such as structural composite lumber, advancement in built-up beams would have the potential to benefit a large portion of the wood industry.

拟议的研究项目将解决与木结构组合梁稳定性相关的长期存在的技术问题。组合梁是通过机械紧固件（例如钉子、螺钉等）垂直连接两块或多块木材而形成的。需要开展研究工作来解决与组合梁相关的设计挑战和不确定性。组合梁的横向稳定性很大程度上受到各层之间滑移的影响。加拿大的设计标准规定了组合梁的设计要求，但叠片间连接滑移的影响并未量化。这可能导致过于保守或不安全的设计。拟议的研究项目旨在通过研究紧固件的复合作用，为 CSA O86 标准中组合梁的横向稳定性提供具体指导。这包括建立实现完全复合作用的设计标准，以及制定在仅实现部分复合作用时降低临界力矩容量的表达式。项目完成后，研究成果将通过出版物和推广计划传播给教育、设计和建筑界。该项目预计将对木材行业产生重大影响，因为研究成果一旦被 CSA O86 标准成功采用，将通过减少工程师目前在指定组合梁时遇到的不确定性来简化设计过程。通过解决与设计、成本和安全相关的问题，组合梁在木结构建筑中的使用将变得更加可靠和经济。由于组合梁可以采用传统锯材或结构复合木材等新材料，因此组合梁的进步将有可能使大部分木材工业受益。