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9.3.1.9.(2)
ApplicationIntent
OH1OS2OP2OS1OS3OH4
ObjectiveOH4 Vibration and Deflection Limitation
Attribution
[F20,F61,F55-OH4] Applies to elements that support floors.
Application
Application 1: 
Cast-in-place concrete that is not required to be reinforced that is used in:
  • footings, foundation walls, walls, columns, grade beams and piers,
  • crawl space ground cover,
  • basement floors, including floors of basement garages, subject to hydrostatic pressure or providing lateral resistance to foundation walls,
  • exterior steps providing structural support (to guards or handrails, for example), and
  • fireplaces and chimneys.
This applies to buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].
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Intent
Intent 1: 
To limit the probability of:
  • interruption of the hydration process,
  • freezing and expansion of internal water, and
  • over-watering due to the melting of ice.
This is to limit the probability of the failure of internal bonds in the concrete, which could lead to reduced compressive strength, which could lead to an inadequate resistance to:
  • expected environmental or structural loads, or
  • air and moisture transfer.
This is to limit the probability of the excessive deformation of concrete, which could lead to:
  • compromised structural integrity, or
  • where concrete elements support an environmental separator, the displacement or failure of required environmental separation elements, which could lead to the deterioration of building elements, which could lead to compromised structural integrity.
Where concrete elements support wood-frame floors, this is to limit the probability of deflection or vibration of such floors, which could lead to negative effects on the psychological well-being of persons.
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