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9.20.6.1.(2)
ApplicationIntent
OH1OS2OP2OH4OS3
ObjectiveOH4 Vibration and Deflection Limitation
Attribution
[F20,F22-OH4] Applies to floors and elements that support floors.
Application
Application 1: 
Minimum thickness of above-ground, unreinforced masonry exterior walls in the bottom storeys of 2- storey buildings and the bottom 2 storeys of 3- storey buildings, in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9]:
  • not exceeding 11 m in height above the foundation wall,
  • in which the roof or floor system above the first storey is not of concrete construction, and
  • of more than one storey in regions where the spectral response acceleration Sa(0.2) is greater than 0.55 that are reinforced in accordance with Sentence 9.20.1.2.(1) and loadbearing masonry exterior walls of 3-storey buildings in regions where the spectral response acceleration Sa(0.2) is greater than 0.35 and less than or equal to 0.55 that are reinforced in accordance with Sentence 9.20.1.2.(2).
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, and
  • Sentence 9.20.6.2.(3), which applies to cavity walls.
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Intent
Intent 1: 
To limit the probability that masonry exterior walls will be unable to resist expected structural loads.
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.
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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