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9.3.1.6.(1)
ApplicationIntent
OS2OP2OH1OH4OS3OS1OS2OP2OH1OS3OS2OP2OS3
ObjectiveOH4 Vibration and Deflection Limitation
Attribution
(a) [F20,F21,F80-OH4] Applies to elements that support floors.
Application
Application 1: 
Minimum compressive strength of 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, 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].
Exceptions: 
except as stated in:
  • Sentence 9.12.4.1.(1), which applies to concrete in trenches beneath footing, and
  • the second row of Table 9.15.4.2.A., which applies to concrete in foundation walls, where a structural capacity of 15 MPa is inadequate based on the thickness of the wall and the height of the finish ground above the basement floor or crawl space ground cover.
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Intent
Intent 1: 
To limit the probability of:
  • insufficient compressive strength to resist expected gravity and lateral loads, or
  • the excessive shrinkage, cracking and premature failure of concrete.
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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