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9.20.7.5.(1)
ApplicationIntent
OH1OS2OP2OS1OH4OS3
ObjectiveOS2 Structural Safety
Attribution
[F20-OS2.1]
[F20-OS2.3] Applies to elements that support or are part of an environmental separator.
Application
Application 1: 
In buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9], chases and recesses in:
  • above-ground, unreinforced masonry walls and nominally reinforced masonry where vertical joints in adjacent courses are aligned [see Article 9.20.9.1.]:
    • 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,
  • in regions where the spectral response acceleration Sa(0.2) is greater than 0.55, loadbearing masonry elements of buildings more than 1 storey in building height [see Sentence 9.20.1.2.(1)]:
    • 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, and
  • in regions where the spectral response acceleration Sa(0.2) is greater than 0.35 and less than or equal to 0.55, loadbearing masonry elements of buildings 3 storeys in building height [see Sentence 9.20.1.2.(2)]:
    • 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 that face shells, which provide most of the loadbearing capacity of hollow units, will be removed, which could lead to an inability to accommodate vertical and horizontal loads, which could lead to cracking.
This is to limit the probability of compromised structural integrity, which could lead to:
  • structural failure of masonry construction, or
  • where masonry construction is part of an environmental separator, the excessive deformation, displacement or failure of required environmental separation elements, which could lead to deterioration, which could lead to further compromised structural integrity.
This is to limit the probability of harm to persons.
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