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9.3.1.7.(2)
ApplicationIntent
OS2OP2OH1OH4OS3OS1
ObjectiveOH4 Vibration and Deflection Limitation
Attribution
[F20,F21,F61,F55-OH4] Applies where concrete elements support wood-frame floors.
Application
Application 1: 
Maximum size of aggregate for site-batched, cast-in-place concrete that is not required to be reinforced that is used in:
  • footings, foundation walls, walls, columns, grade beams and piers,
  • basement floors, including floors of basement garages, subject to hydrostatic pressure or providing lateral resistance to foundation walls,
  • garage and carport floors,
  • exterior steps, including 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 that the concrete will not flow around the aggregate in the typically thin wall and slab sections used in Part 9 buildings, which could lead to aggregate segregation, which could lead to:
  • reduced compressive strength,
  • increased shrinkage and cracking, or
  • low resistance to air and moisture transfer.
This is to limit the probability of:
  • spalling,
  • inadequate performance, or
  • premature failure of concrete under expected environmental or structural loads.
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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