2.10 Design scenario (CF)
2.10.1 Design scenario description
The challenging fires are intended to represent the credible worst case design scenario in normally occupied spaces that will challenge the fire protection features of the building.
The design fires must be modified during an analysis (depending on the methodology used) to account for building ventilation and the effects of automatic fire suppression systems (if any) on the fire. The design scenario RC (2.11) will require the overall robustness of the design to be examined separately.
The designer must—
for each location of the challenging fire, use a single fire source to evaluate the building’s protection measures; and
consider the impact on occupants who may be using escape routes external to the building as well as internal routes; and
assume that active and passive fire safety systems in the building will perform as intended by the design.
2.10.2 Typical method or solution
This design scenario requires the ASET/ RSET analysis of the impact on all building occupants with design fires located in various locations within the building, except for those rooms or spaces excluded in the design scenario described above.
The designer must calculate the fire environment in the evacuation routes over the period of time the occupants require to escape. Assess the fire environment based on the FED and visibility at the location of the occupants.