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9.20.8.4.(2)
ApplicationIntent
OH1OS2OP2OS1OH4OS3
ObjectiveOH4 Vibration and Deflection Limitation
Attribution
[F20-OH4] Applies to floors and elements that support floors.
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], support of beams and columns bearing on:
  • 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,
    • in which the roof or floor system above the first storey is not of concrete construction, and
    • where the thickness of the masonry wall or wythe is less than 190 mm,
  • 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)]:
    • not exceeding 11 m in height above the foundation wall,
    • in which the roof or floor system above the first storey is not of concrete construction, and
    • where the thickness of the masonry wall or wythe is less than 190 mm, 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)]:
    • not exceeding 11 m in height above the foundation wall,
    • in which the roof or floor system above the first storey is not of concrete construction, and
    • where the thickness of the masonry wall or wythe is less than 190 mm.
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 masonry walls will be unable to resist the concentrated loads imposed by beams or columns, which could lead to cracking of masonry.
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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