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9.4.3.1.(1)
ApplicationIntent
OS2OP2OH4OS3OH1
ObjectiveOS3 Safety in Use
Attribution
[F22-OS3.1] Applies to floors and elements that support floors.
[F22-OS3.7] Applies to walls, and elements that support walls, that contain doors or windows required for emergency egress.
Application
Application 1: 
Maximum deflection of roof rafters, roof joists, roof beams and roof decking of plank and beam construction, ceiling joists, floor joists, floor beams, and floor decking, beams, joists and decking for balconies, decks and other accessible exterior platforms, in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].
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Intent
Intent 1: 
To limit the probability of excessive deflection of structural members.
This is to limit the probability of:
  • the excessive deflection or vibration of directly or indirectly supported floors, which could lead to persons losing their balance, tripping or falling; and
  • the excessive movement or deformation of directly or indirectly supported walls with windows or doors, which could lead to compromised operation of doors or windows required for egress in an emergency.
This is to limit the probability of harm to persons.
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