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9.17.3.3.(1)
ApplicationIntent
OS3OS2OP2OH1OH4
ObjectiveOS3 Safety in Use
Attribution
[F80-OS3.1] Applies to floors and elements that support floors.
Application
Application 1: 
Treatment of exterior steel columns, in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9], that are used to support:
  • beams carrying loads from not more than 2 wood-frame floors where
    • the supported length of joists bearing on such beams does not exceed 5 m, and
    • the live load on any floor does not exceed 2.4 kPa,
  • beams or header joists carrying loads from not more than 2 levels of wood-frame balconies, decks or other accessible, exterior platforms, or 1 level plus roof, where
    • the supported length of joists supported by such beams or rim joists does not exceed 5 m,
    • the sum of the specified snow and occupancy loads on the platform type construction or roof does not exceed 4.8 kPa,
    • the platform serves only a single suite of residential occupancy, and
    • the platform does not serve as a required exit, and
  • carport roofs.
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Intent
Intent 1: 
For columns exposed to the weather, to limit the probability that the columns will rust at an excessive rate, which could lead to the premature failure of the columns.
This is to limit the probability of:
  • compromised structural integrity, or
  • for environmental separators or elements supporting an environmental separator, the displacement or failure of required environmental separation elements, which could lead to the deterioration of building elements.
For floors and elements supporting floors, this to limit the probability of excessive deflection or vibration of floors, which could lead to a loss of balance, tripping or falling, which could lead to harm to persons.
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