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9.20.9.1.(1)
OH1OS2OP2OS1OH4OS3
ObjectiveOS2 Structural Safety
Attribution
[F20-OS2.3] Applies to elements that support or are part of an environmental separator.
Application
Application 1: 
Vertical joints in adjacent courses in:
  • above-ground, nominally unreinforced masonry, and
  • above-ground masonry reinforced with the equivalent of not less than 2 corrosion-resistant steel bars of 3.76 mm diam placed in the horizontal joints at vertical intervals not exceeding 460 mm.
This applies to masonry construction to which Section 9.20. applies [see Sentence 9.20.1.1.(1) for application of Section 9.20.], in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].
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 of an inadequate resistance to in-plane and transverse shear stresses, which could lead to cracking or structural failure of vertical mortar joints.
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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