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9.20.12.1.(2)
ApplicationIntent
OS2OP2OH1OS1OH4OS3
ObjectiveOP2 Structural Sufficiency of the Building
Attribution
[F20-OP2.1,OP2.4]
[F20-OP2.3] Applies to elements that support or are part of an environmental separator.
Application
Application 1: 
Projection of corbeling for masonry, in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9]:
  • where the wall height above the foundation wall does not exceed 11 m, and
  • in which the roof or floor system above the first storey is not of concrete construction.
Exceptions: 
except as stated in Sentence 9.20.1.1.(2), which applies to buildings other than described above, or where the masonry is designed for specified loads on the basis of ultimate and serviceability limit states.
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Intent
Intent 1: 
To limit the probability of excessive eccentricity of loads, which could lead to foundation walls being unable to resist gravity loads or earth pressure from the exterior, which could lead to cracking of foundation walls and supported walls or floors.
This is to limit the probability of:
  • compromised structural integrity of masonry construction,
  • where masonry construction is part of an environmental separator, the displacement or failure of required environmental separation elements, which could lead to deterioration, or
  • an inability to resist expected loads, which could lead to”
    • the excessive movement or deformation of walls, or
    • the excessive deflection or vibration of floors.
This is to limit the probability of:
  • the space being unsuitable for its intended use,
  • compromised operation of windows or doors, or
  • damage to the building.
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