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9.23.4.2.(1)
ApplicationIntent
OS2OP2OH1OH4OS1OS3
ObjectiveOH4 Vibration and Deflection Limitation
Attribution
[F22-OH4] Applies to floors and elements that support floors.
Application
Application 1: 
Maximum spans, in wood-frame constructions to which Section 9.23. applies [see Sentence 9.23.1.1.(1) for application of Section 9.23.], for lumber joists used to support floors:
  • in residential areas,
  • where the floor live load does not exceed 1.9 kPa, or
  • supporting a topping of concrete that is of normal weight and 38 to 51 mm thick, that is placed directly on the subflooring, and that has not less than 20 MPa compressive strength after 28 days [see Article 9.23.4.4.].
Exceptions: 
except:
  • for constructions designed according to Part 4 for the same loading conditions and not exceeding the design criteria for uniform loading and vibration, and
  • as stated in Sentence 9.23.4.4.(1), which applies to floors supporting concrete toppings other than described above.
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Intent
Intent 1: 
To limit the probability of excessively long spans, which could lead to an inability to resist expected lateral, gravity or wind-uplift loads.
For floors and constructions supporting floors, this is to limit the probability of:
  • compromised structural integrity, or
  • for exterior floors or environmental separators supporting a floor, the excessive deformation, displacement or failure of required environmental separation elements, which could lead to deterioration, which could lead to further compromised structural integrity.
This is to limit the probability of excessive movement, vibration or deflection of floors, which could lead to negative effects on the psychological well-being of persons.
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