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9.20.12.1.(2)
ApplicationIntent
OS2OP2OH1OS1OH4OS3
ObjectiveOS2 Structural Safety
Attribution
[F20-OS2.1]
[F20-OS2.3] 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, which could lead to:
  • structural failure of masonry construction, or
  • where masonry construction is part of an environmental separator, the excessive deformation, displacement or failure of required environmental separation elements, which could lead to deterioration, which could lead to further compromised structural integrity.
This is to limit the probability of harm to persons.
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