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9.20.2.6.(1)
ApplicationIntent
OS2OP2OH1OH4OS3OP1
ObjectiveOS2 Structural Safety
Attribution
[F80-OS2.1,OS2.3] [F61-OS2.3]
Application
Application 1: 
Concrete blocks exposed to the weather, in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9], used in:
  • unreinforced masonry and masonry veneer walls, nominally reinforced masonry where vertical joints in adjacent courses are aligned [see Article 9.20.9.1.], and loadbearing masonry elements reinforced as required by Article 9.20.1.2. in regions where the seismic spectral response acceleration, Sa(0.2), is greater than 0.35 [see Subsection 9.20.15.], where:
    • the walls are not in contact with the ground,
    • the wall height above the foundation wall does not exceed 11 m, and
    • the roof or floor assembly above the first storey is not of concrete construction,
  • loadbearing elements of masonry buildings more than 1 storey in building height in regions where the seismic spectral response acceleration, Sa(0.2), is greater than 0.55 [see Sentence 9.20.1.2.(1)], where:
    • the walls are not in contact with the ground,
    • the wall height above the foundation wall does not exceed 11 m, and
    • the roof or floor system above the first storey is not of concrete construction, and
  • loadbearing elements of masonry buildings that are 3 storeys in building height in regions where the seismic spectral response acceleration, Sa(0.2), is greater than 0.35 and less than or equal to 0.55 [see Sentence 9.20.1.2.(2)], where:
    • the walls are not in contact with the ground,
    • the wall height above the foundation wall does not exceed 11 m, and
    • 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 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,
  • Sentence 9.20.5.2.(3), which applies to the design of steel angle lintels supporting masonry other than veneer, masonry and reinforced concrete lintels, and masonry arches,
  • Sentence 9.20.6.4.(4), which applies to masonry veneer required to be individually supported by the backing material,
  • Sentence 9.20.6.6.(1), which applies to slab facings and precast concrete panel facings, and
  • Sentence 9.20.9.5.(3), which applies to the securing of masonry veneer that is individually supported by masonry or wood-frame backing.
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Intent
Intent 1: 
To limit the probability that such concrete blocks will be of inadequate mass or absorb excessive amounts of water, which could lead to inadequate resistance to freeze-thaw stresses.
This is to limit the probability of compromised structural integrity, which could lead to:
  • the structural failure of masonry construction,
  • 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, or
  • in assemblies exposed to moisture or the exterior, damage and deterioration, which could lead to further compromised structural integrity.
This is to limit the probability of harm to persons.
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