Formwork for Concrete Structures by R.L.Peurifoy and G.D- By EasyEngineering.net

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48
Species and
Nominal Size
Douglas-Fir-Larch
2″-4″ thick and 2″ &
wider
Hem-Fir 2″-4″ thick
and 2″ & wider
Spruce-Pine-Fir 2″-4″
thick and 2″ & wider
Grade
No. 1
No. 2
No. 1
No. 2
No. 1
No. 2
Multiplier 3 of values for loads
< 7 days
Multiplier 4 of values for
moisture > 19%
Extreme
Fiber in
Bending
F b
1,000
900
975
850
875
875
Shear
Parallel to
Grain
F v
180
180
150
150
135
135
Reference Design Value, lb per sq in
Compression
Perpendicular
to Grain
F C ^
625
625
405
405
425
425
Compression
Parallel to
Grain
F C //
1,500
1,350
1,350
1,300
1,150
1,150
E
Modulus of Elasticity
1,700,000
1,600,000
1,500,000
1,300,000
1,400,000
1,400,000
1.25 1.25 1.0 1.25 1.0 1.0
0.85 ∗ 0.97 0.67 0.8 ∗∗ 0.9 0.9
E min
620,000
580,000
550,000
470,000
510,000
510,000
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Notes:
1. Values shown are not size adjusted for the above species of lumber.
2. See Table 4-3a for applicable size adjustment factors.
3. See Tables 4-4 through 4-8 for other adjustment factors that may be applicable.
4. ∗
denotes when (F b
)(C F
) < 1,150 lb per sq in., C M
= 1.0.
5.
∗∗
denotes when (F b
)(C F
) < 750 lb per sq in., C M
= 1.0.
6. See the National Design Specification for Wood Construction for other grades and species of wood and for additional adjustments that may be appropriate
for conditions where wood is used.
TABLE 4-3 Reference Design Values for Several Species of Lumber Less Than 19% Moisture
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