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9.20.9.4.(6)
ApplicationIntent
OH1OS2OP2OS1OH4OS3
ObjectiveOP2 Structural Sufficiency of the Building
Attribution
[F20-OP2.1,OP2.4]
[F20-OP2.3] Applies to elements that support or are part of an environmental separator.
Application
Application 1: 
Location and spacing of rod-type metal ties that tie together the wythes of above-ground 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, and
  • in which the roof or floor system above the first storey is not of concrete construction.
Exceptions: 
except:
  • for cavity walls and masonry veneer/masonry backing walls, 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:
  • concentrations of stress in areas that typically experience higher levels of lateral stress (e.g. around openings), which could lead to an inability to resist transverse or vertical loads, and
  • inadequate load distribution among the wythes of multiple-wythe masonry walls.
This is to limit the probability of 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, or
  • an inability to resist expected loads, which could lead to:
    • the excessive movement or deformation of walls, or
    • the excessive deflection or vibration of floors.
This is to limit the probability of:
  • the space being unsuitable for its intended use,
  • compromised operation of windows or doors, or
  • damage to the building.
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