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9.20.11.6.(1)
OS2OP2OH1OH4OS3OS1
ObjectiveOS1 Fire Safety
Attribution
[F20-OS1.2] Applies to assemblies required to provide fire resistance.
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.
Where building elements are required to provide fire resistance, this is to limit the probability of excessive deflection of the elements, which could lead to compromised fire resistance, which could lead to 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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