ISO/TR 24679-5:2023 消防安全工程 火灾中结构的性能 第5部分：加拿大木材建筑实例

标准编号：ISO/TR 24679-5:2023

中文名称：消防安全工程 火灾中结构的性能 第5部分：加拿大木材建筑实例

英文名称：Fire safety engineering — Performance of structures in fire — Part 5: Example of a timber building in Canada

发布日期：2023-07

标准范围

根据ISO 24679-1中给出的方法，本文件提供了与多层木结构建筑耐火性评估相关的消防工程应用。为了便于理解本文介绍的设计过程，本文档遵循与ISO？24679-1.消防安全工程方法适用于多层木结构建筑的耐火性，并考虑影响结构构件耐火性的特定设计火灾场景。在这个工作实例中，采用了构件级（构件分析）的防火性能分析方法。这种方法通常提供比系统级（全局结构）分析或结构部分分析更保守的设计，其中可以评估部件之间的相互作用。组件级方法的一个优点是可以使用简单的分析模型或电子表格来完成计算。介绍了使用计算流体动力学的高级建模，以复制实际的办公室隔间火灾场景，并评估木材对火灾增长、强度和持续时间（如果有）的贡献。木材元件的热结构性能通过使用有限元方法的高级建模进行评估。本文件中选择的防火设计方案仅用于结构耐火性的评估。例如，它们不适用于评估烟雾产生、生存条件或其他生命安全条件。

This document provides a fire engineering application relative to the fire resistance assessment of a multi-storey timber building according to the methodology given in ISO 24679-1. In an attempt to facilitate the understanding of the design process presented herein, this document follows the same step-by-step procedure as that given in ISO 24679-1.

The fire safety engineering approach is applied to a multi-storey timber building with respect to fire resistance and considers specific design fire scenarios, which impact the fire resistance of structural members.

A component-level (member analysis) approach to fire performance analysis is adopted in this worked example. Such an approach generally provides a more conservative design than a system-level (global structural) analysis or an analysis of parts of the structure where interaction between components can be assessed. An advantage of the component-level approach is that calculations can be done with the use of simple analytical models or spreadsheets. Advanced modelling using computational fluid dynamics is presented to replicate an actual office cubicle fire scenario and for assessing timber contribution to fire growth, intensity and duration, if any. The thermo-structural behaviour of the timber elements is assessed through advanced modelling using the finite element method.

The fire design scenarios chosen in this document are only used for the evaluation of the structural fire resistance. They are not applicable for assessing, for example, smoke production, tenability conditions or other life safety conditions.

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