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9.10.7.1.(1)
ApplicationIntent
OS1OP1
ObjectiveOS1 Fire Safety
Attribution
[F03-OS1.2] [F04-OS1.3]
Application
Application 1: 
Protection of structural steel members used in construction required to have a fire-resistance rating, in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].
Exceptions: 
except as stated in Sentence 3.2.2.3.(1), which applies to:
  • steel lintels above openings not more than 2 m wide in loadbearing walls and not more than 3 m wide in non-loadbearing walls,
  • steel lintels above openings more than 2 m wide in loadbearing walls and more than 3 m wide in non-loadbearing walls where the lintels are supported at intervals of not more than 2 m by structural members with the required fire-resistance rating,
  • the bottom flanges of shelf angles and plates that are not a part of the structural frame,
  • steel members for framework around elevator hoistway doorways, steel for the support of elevator and dumbwaiter guides, counterweights and other similar equipment, that are entirely enclosed in a hoistway and are not a part of the structural frame of the building,
  • steel members of stairways and escalators that are not a part of the structural frame of a building,
  • steel members of porches, exterior balconies, exterior stairways, fire escapes, cornices, marquees and other similar appurtenances, provided they are outside an exterior wall of a building, and
  • loadbearing steel members wholly or partly outside a building face in a building not more than 4 storeys in building height and classified as Group A, B, C, D or F, Division 3 major occupancy, provided the members are not less than 1 m away from any unprotected opening in an exterior wall or shielded from heat radiation in the event of a fire within the building.
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Intent
Intent 1: 
To limit the probability that structural steel members will fail prematurely when exposed to fire, which could lead to the failure or collapse of rated construction supported by the structural steel members [e.g. floor, roof and wall assemblies] during the time required to achieve occupant safety and for emergency responders to perform their duties, which could lead to harm to persons.
Intent 2: 
To limit the probability that structural steel members will fail prematurely when exposed to fire, which could lead to the failure or collapse of rated construction supported by the structural steel members [e.g. floor, roof and wall assemblies], which could lead to the spread of fire from a lower storey of a building to an upper storey during the time required to achieve occupant safety and for emergency responders to perform their duties, which could lead to harm to persons.
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