Structural Fire Performance of Engineered-Wood Building Systems

工程木建筑系统的结构防火性能

• 批准号: RGPIN-2014-05066
• 负责人: Salem, Osama(Sam)
• 金额: $ 1.6万
• 依托单位: Lakehead University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2017
• 资助国家: 加拿大
• 起止时间: 2017-01-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=636071
• 关键词: Structural; Fire; Performance; Engineered; Wood

Wood has been in demand as a competent construction material due to its beauty, economy, and ease of construction. However, in fire conditions light-wood structural members, if not treated, can perform poorly. On the contrary, heavy timber sections such as those made of glued-laminated (Glulam) and cross-laminated timbers (CLT) can retain their strength for a longer period of time in fire, since heavy wood sections lose strength slowly and only as material is lost through surface charring. In addition, those new engineered-wood products offer a strong combination of environmental performance and sustainability. Nevertheless, concerns about their structural fire performance have resulted in regulations that restrict their use through the prescriptive provincial and national codes and standards. The main objective of the research program proposed in this application is to investigate the structural fire performance of Glulam and CLT members and assemblies. Another important issue that needs to be investigated in this program is the different connecting configurations of structural members made of the aforementioned engineered-wood products. Accordingly, this research program will include both normal and elevated temperature examination of different types of connection configurations, such as bolted shear- and moment-resisting connections, as well as new assembling configurations that can improve the structural performance of Glulam members at elevated temperatures. The results obtained from this research will address important fire safety issues that could adversely affect potential markets for engineered-wood products in Canada. The proposed research program has a number of short and long term objectives. In the short term, producing new and reliable experimental data for the behaviour of both common and new bolted connections used in Glulam framed systems at both normal and elevated temperatures, as well as developing non-linear finite element computer models that can accurately simulate the structural behaviour of those connections are targeted in this program. In addition, training highly qualified individuals including undergraduate and graduate students who will use their aquired training and hands-on experience in different structural fire engineering applications is another important objective. In the long term, the results and findings of this research program will contribute to the advancement of the design of low- to mid-rise buildings made of engineered-wood products in Canada.In order to achieve the abovementioned objectives, the proposed research will involve three different themes: experimental testing, computer modelling, and analytical study. The experimental program will be conducted in two phases; the normal and elevated temperature testing phases. A state-of-the art large gas furnace housed in the new Structural Fire Research Facility at Lakehead University will be used to accommodate the planned fire resistance experiments. A computer finite element modelling study using the commercial finite element software package ABAQUS will follow each set of tests in order to simulate the structural behaviour of the tested connections and assemblies made of Glulam and CLT. In a subsequent phase, the results of the experimental testing program along with the predictions of the computer models will be integrally used to carry out an analytical study that will lead to the development of fire-safe design guidelines for the tested assemblies and connections. It is highly anticipated that the unique experimental results and the computer modelling outcomes of this research program will improve our understanding of the structural fire performance of engineered-wood building systems and help us having safer buildings in Canada.

由于木材美观、经济且易于施工，木材作为一种合格的建筑材料一直受到人们的欢迎。然而，在火灾条件下，轻木结构构件如果不经过处理，性能可能会很差。相反，诸如胶合层压木材 (Glulam) 和交叉层压木材 (CLT) 制成的重型木材型材可以在火灾中保持较长时间的强度，因为重型木材型材会缓慢失去强度，并且仅当材料通过表面炭化而损失时。此外，这些新型工程木产品将环保性能和可持续性紧密结合在一起。然而，对其结构防火性能的担忧导致了通过规定的省级和国家规范和标准限制其使用的法规。本申请中提出的研究计划的主要目标是研究胶合木和 CLT 构件及组件的结构防火性能。该计划需要研究的另一个重要问题是由上述工程木制品制成的结构构件的不同连接配置。因此，该研究计划将包括不同类型连接配置的常温和高温检查，例如螺栓抗剪和抗弯矩连接，以及可以提高胶合木构件在高温下结构性能的新组装配置。这项研究获得的结果将解决可能对加拿大工程木产品潜在市场产生不利影响的重要消防安全问题。拟议的研究计划有许多短期和长期目标。在短期内，该计划的目标是为胶合木框架系统中使用的普通和​​新型螺栓连接在正常温度和高温下的行为产生新的可靠的实验数据，以及开发能够准确模拟这些连接的结构行为的非线性有限元计算机模型。此外，培训高素质人才（包括本科生和研究生）是另一个重要目标，他们将在不同的结构消防工程应用中运用所获得的培训和实践经验。从长远来看，该研究计划的结果和发现将有助于加拿大工程木制品中低层建筑设计的进步。为了实现上述目标，拟议的研究将涉及三个不同的主题：实验测试、计算机建模和分析研究。实验计划将分两个阶段进行；正常和高温测试阶段。湖首大学新的结构火灾研究设施中的最先进的大型煤气炉将用于进行计划中的耐火实验。每组测试后将使用商用有限元软件包 ABAQUS 进行计算机有限元建模研究，以模拟由胶合木和 CLT 制成的测试连接和组件的结构行为。在后续阶段，实验测试程序的结果以及计算机模型的预测将被综合用于进行分析研究，从而为测试的组件和连接制定消防安全设计指南。令人期待的是，该研究项目的独特实验结果和计算机建模结果将提高我们对工程木建筑系统结构防火性能的理解，并帮助我们在加拿大拥有更安全的建筑。