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质建筑中建筑光束稳定性有关的长期技术问题。通过机械紧固件（例如，指甲，螺钉等）将两块或更多块木材连接来形成内置梁。需要进行研究工作来应对与内置光束相关的设计挑战和不确定性。积累光束的横向稳定性在很大程度上受单个层之间的滑动的影响。加拿大的设计标准指定了对建筑梁设计的要求，但是层压之间的连接滑移的效果并未量化。这可能会导致并且过于保守或不安全的设计。拟议的研究项目旨在通过调查紧固件的复合作用来提供有关CSA O86标准中内置光束横向稳定性的具体指导。这包括建立设计标准，在该标准下实现了完整的复合作用，并制定表达式，这些表达式将在仅实现部分复合作用时降低关键时刻能力。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，设计和建筑社区。预计该项目将对木材行业产生重大影响，因为一旦CSA O86标准成功地采用了研究结果，该项目将通过减少工程师当前在指定内置光束时所经历的不确定性来简化设计过程。通过解决与设计，成本和安全性相关的方面，内置光束将变得更加可靠和经济用于木材结构。由于可以从传统的锯木材或新材料（例如结构复合木材）中采购，因此内置梁的进步将有可能使大部分木材工业受益。