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Lumber - Compression - CSA O86
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Lumber size
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Lumber
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Width
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b
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=
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in
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mm
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Depth
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d
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=
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in
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mm
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Cross section
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A
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=
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in2
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mm2
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Wood properties
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Wood species and
grade
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Bearing strength
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Fcp
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=
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psi
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MPa
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Axial compression
strength
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fc
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=
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psi
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MPa
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Modulus of
elasticity
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E05
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=
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psi
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MPa
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Factors
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Load factor
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α
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=
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Resistance factor
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φ
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=
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Resistance factor
(bearing)
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φb
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=
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Load-duration
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KD
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=
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System
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KH
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=
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Service-condition
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Bearing
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KScp
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=
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Axial
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KSc
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=
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Axial
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Kse
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=
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Treatment
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KT
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=
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Size factor
(bearing)
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KZcp
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=
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Bearing length
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KB
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=
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Factored
axial strength
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(KD, KH, KSc, KT, α,φ)
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Fc
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=
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psi
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MPa
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Effective length
variables
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Effective length
factor
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Ke
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=
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Number of braces
in the "b" direction
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Number of braces
in the "d" direction
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Allowable axial
load (imperial)
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Post full-height
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Direction
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Effective
length
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Slenderness
ratio
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Size
factor
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Slenderness
factor
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Allowable
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L ( ft )
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Le ( ft )
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Cc ( < 50 )
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KZc
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Kc
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P ( lbf )
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b
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d
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Allowable axial
load (metric)
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Post full-height
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Direction
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Effective
length
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Slenderness
ratio
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Size
factor
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Slenderness
factor
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Allowable
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L ( m )
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Le ( m )
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Cc ( < 50 )
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KZc
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Kc
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P ( kN )
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b
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d
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Allowable bearing
load
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Allowable bearing
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(KD, KScp, KT, KB, KZcp,α,φb)
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Q
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=
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lbf
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kN
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Slenderness ratio
above 50
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Version:
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20260319
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