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9.20.9.2.(1)
ApplicationIntent
OS2OP2OH1OH4OS3OS1
ObjectiveOH4 Vibration and Deflection Limitation
Attribution
[F20,F22-OH4] Applies to floors and elements that support floors.
Application
Application 1: 
Bonding or tying together of masonry walls that consist of 2 or more wythes, 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,
  • the walls are not in contact with the ground, and
  • the roof or floor assembly above the first storey is not of concrete construction.
Exceptions: 
except as stated in:
  • Sentence 9.20.1.1.(2), which applies to masonry walls other than those described above, or where the masonry is designed for specified loads on the basis of ultimate and serviceability limit states, and
  • Article 9.20.9.5., which applies to ties for masonry veneer.
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Intent
Intent 1: 
To limit the probability of inadequate lateral support for wythes of masonry walls, which could lead to wythes and masonry walls being unable to resist transverse or vertical loads, which could lead to cracking or buckling.
This is to limit the probability of:
  • compromised structural integrity of masonry construction, or
  • where masonry construction is part of an environmental separator, the displacement or failure of required environmental separation elements, which could lead to deterioration.
For floors and elements supporting floors, this is to limit the probability of excessive movement, deflection or vibration, which could lead to negative effects on the psychological well-being of persons.
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