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9.15.4.2.(8)
ApplicationIntent
OS2OP2OH1OH4OS3
ObjectiveOH4 Vibration and Deflection Limitation
Attribution
[F20,F22-OH4] Applies to floors and elements that support floors.
Application
Application 1: 
Bond beams in unit masonry foundation walls made of concrete block that are required to be reinforced, are subject to lateral earth pressure, and are erected on average stable soils having an allowable bearing pressure of 75 kPa or greater, where the wind loads on the exposed portion of the foundation do not exceed 0.7 kPa, for buildings of wood-frame or masonry construction 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 9.15.1.2.(1), which applies to foundations and footings for buildings erected on permafrost, and
  • Sentence 9.15.1.3.(1), which applies to detached buildings whose superstructure conforms to the requirements of the deformation resistance test in CAN/CSA-Z240.2.1, “Structural Requirements for Mobile Homes.”
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Intent
Intent 1: 
To limit the probability that the block wall will be insufficiently stiff and strong at critical edges and openings, which could lead to an inability to resist transverse or vertical loads, which could lead to the cracking or displacement of foundation walls.
This is to limit the probability of:
  • compromised structural integrity, 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.
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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