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9.20.11.6.(1)
OS2OP2OH1OH4OS3OS1
ObjectiveOS2 Structural Safety
Attribution
[F20-OS2.3] Applies to elements that support or are part of an environmental separator.
Application
Application 1: 
Masonry piers with anchor bolts installed in their tops, 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 insufficient depth of concrete or masonry for an adequate bond with anchor bolts, which could lead to inadequate withdrawal resistance, which could lead to an inability to resist expected wind loads, which could lead to overturning, lifting, sliding or excessive deflection of the superstructure.
This is to limit the probability of compromised structural integrity, which could lead to:
  • structural failure of the superstructure, or
  • where piers support 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.
Intent 2: 
To direct Code users to Sentence 9.15.2.3.(4), which contains requirements for piers.
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