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一个长期存在的技术问题，即木结构建筑中组合梁的稳定性。组合梁通过机械紧固件（例如，钉子、螺钉等）。需要进行研究工作，以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在很大程度上受各层间滑移的影响。加拿大的设计标准规定了组合梁的设计要求，但没有量化层间连接滑移的影响。这可能导致过度保守或不安全的设计。建议的研究项目的目的是提供具体的指导组合梁的横向稳定性在CSA O86标准通过调查的组合行动的紧固件。这包括建立设计准则，在此准则下实现完全的复合作用，并制定表达式，当仅实现部分复合作用时，将降低临界弯矩承载力。项目完成后，研究成果将通过出版物和外展计划传播到教育，设计和建筑界。该项目预计将对木材行业产生重大影响，因为研究结果一旦被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、成本和安全有关的问题，组合梁在木结构中的使用将变得更加可靠和经济。由于组合梁可以来自传统的锯材或新材料，如结构复合木材，组合梁的进步将有可能使木材行业的很大一部分受益。