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9.20.3.2.(3)
ApplicationIntent
OS2OP2OH1OH4OS3OS1
ObjectiveOH4 Vibration and Deflection Limitation
Attribution
[F20,F21,F61-OH4] Applies to floors and elements that support floors.
Application
Application 1: 
Mortar mixes, 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,
  • mortar, grout, mortar joints, corbelling and protection for unit masonry foundation walls [see Sentence 9.15.2.2.(2)], and
  • interior masonry foundation walls not subject to lateral earth pressure [see Sentence 9.15.4.10.(1)].
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, and
  • Sentence 9.20.6.4.(4), which applies to masonry veneer required to be individually supported by the backing material.
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Intent
Intent 1: 
To limit the probability of:
  • an excessively high cement/aggregate ratio, which could lead to poor workability, excessive compressive strength and attendant high shrinkage, which could lead to tensile stresses and cracking of mortar or masonry units, or
  • an excessively low cement/aggregate ratio, which could lead to weak, porous mortar and inadequate bonding with masonry units.
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
  • in assemblies exposed to moisture or the exterior, damage and deterioration.
For floors and elements supporting floors, this is to limit the probability of excessive movement, deflection or vibration, which could lead to negative effects on the psychological well-being of persons.
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