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

58 Chapter Four
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Type of Stress
Extreme Fiber
Stress in
Bending (F b
)
Tension in
Plane of
Plies (F t
)
Face Grain
Parallel or
Perpendicular
to Span (at 45 o
to Face Grain,
Use 1 ⁄ 6 F t
)
Species
Group of
Face Ply
1
2, 3
F b 4
and
F t
Grade Stress Level
S-1 S-2 S-3
Wet Dry Wet Dry Dry Only
1,430 2,000 1,190 1,650 1,650
980 1,400 820 1,200 1,200
940 1,330 780 1,110 1,110
Compression
in Plane of
Plies (F C
)
Parallel or
Perpendicular
to Face Grain
(at 45 o to
Face Grain,
Use 1 ⁄ 3 F C
)
F C
1
2
3
4
970
730
610
610
1,640
1,200
1,060
1,000
900
680
580
580
1,540
1,100
950
950
1,540
1,100
950
950
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Shear
through the
Thickness (F ν
)
Parallel or
Perpendicular
to Face Grain
(at 45 o to
Face Grain,
Use 2 F ν
)
F ν
1
2, 3
4
155
120
110
190
140
130
155
120
110
190
140
130
160
120
115
Rolling Shear
(in the Plane
of Plies)
Parallel or
Perpendicular
to Face Grain
(at 45° to
Face Grain,
Use 1 1 ⁄ 3 F s
)
F s
Marine
and
Structural I
All Others
(see note
3 below)
63
44
75
53
63
44
75
53
–
48
TABLE 4-10
Allowable Stresses, in Pounds per Square Inch, for Plywood
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