FD ISO/TR 24679-5, P92-550-5 (10/2023)

This document develops a fire safety engineering application relating to the fire resistance assessment of a multi-storey wooden building in accordance with the methodology given in ISO 24679-1. In order to facilitate the understanding of the design process presented below, this document follows the same step-by-step procedure as that given in ISO 24679-1. The fire safety engineering approach is based on the fire resistance of a multi-story wooden building and considers specific design fire scenarios, which impact the fire resistance of structural elements. In the example developed below, an approach at the component level (element analysis) was adopted for the analysis of fire resistance. Such an approach generally provides a more conservative design than a (global structural) analysis at the system level or an analysis of parts of the structure especially when an interaction between the elements can be assessed. An advantage of the component level approach is that calculations can be performed with the use of simple analytical models or spreadsheets. Advanced modeling using fluid dynamics using a field model is presented to reproduce a real office cubicle fire scenario and to assess the contribution of wood in growth, intensity and duration of the fire, if applicable. The thermo-structural behavior of wooden elements is evaluated by means of advanced modeling using the finite element method. The design fire scenarios chosen in this document are only used for the evaluation of the fire resistance of the building structure elements. They do not apply to the assessment of, for example, smoke production, tenability conditions or other conditions relating to personal safety.
(Automatic translation from French)