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9.20.17.4.(2)
ApplicationIntent
OS2OP2OH1OH4OS3
ObjectiveOS2 Structural Safety
Attribution
[F20-OS2.1]
[F22-OS2.4]
[F20,F22-OS2.3] Applies to elements that support or are part of an environmental separator.
Application
Application 1: 
Construction of lintels over openings wider than 900 mm in loadbearing flat insulating concrete form walls not in contact with the ground, in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9], where:
  • the floor-to-floor height is not greater than 3 m,
  • the buildings are not more than 2 storeys in building height and they contain only a single dwelling unit, and
  • the buildings are erected in locations where the seismic spectral response acceleration, Sa(0.2), is not greater than 0.4.
Exceptions: 
except as stated in:
  • Sentence 9.20.1.1.(2), which applies to insulating concrete form walls other than those described above, or where the walls are designed for specified loads on the basis of ultimate and serviceability limit states, and
  • Sentence 9.20.17.4.(3), which applies to shear reinforcement for openings wider than 1 200 mm.
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Intent
Intent 1: 
To limit the probability of lintels that are inadequate in size or amount of reinforcement, or have an excessive span, which could lead to the excessive deflection or failure of lintels.
This is to limit the probability of compromised structural integrity, which could lead to:
  • structural failure, or
  • where elements support or are part of an environmental separator, the displacement or failure of required environmental separation elements, which could lead to the deterioration of building elements.
This is to limit the probability of harm to persons.
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