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9.20.11.1.(1)
ApplicationIntent
OH1OS2OP2OS1OH4OS3
ObjectiveOH4 Vibration and Deflection Limitation
Attribution
[F20,F22-OH4] Applies to floors and elements that support floors.
Application
Application 1: 
Anchorage to floor or roof assemblies providing lateral support of above-ground masonry walls, 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:
  • where floor joists are located not more than 1 m above grade where the lateral load on the wall will be less than it would be if the joists were located at a point higher up the wall, and
  • 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 inadequate lateral stiffness of masonry walls, which could lead to an inability to resist lateral loads or inadequate distribution of gravity loads, which could lead to cracking or buckling.
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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