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

218 Chapter Nine
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Thickness,
in.
Class I
Approx
Weight,
lb/ft 2
Properties for Stress Applied
Parallel to Face Grain (face
grain across supports)
I
Moment
of
Inertia,
in. 4 /ft
S e
Effective
Section
Modulus,
in. 3 /ft
Ib/Q
Rolling
Shear
Constant,
in. 2 /ft
Properties for Stress Applied
Perpendicular to Face Grain
(face grain along supports)
I
Moment
of
Inertia,
in. 4 /ft
S e
Effective
Section
Modulus,
in. 3 /ft
Ib/Q
Rolling
Shear
Constant,
in. 2 /ft
¹ 5 ⁄32 1.4 0.066 0.244 4.743 0.018 0.107 2.419
½ 1.5 0.077 0.268 5.153 0.024 0.130 2.739
¹ 9 ⁄32 1.7 0.115 0.335 5.438 0.029 0.146 2.834
5
⁄8 1.8 0.130 0.358 5.717 0.038 0.175 3.094
23
⁄32 2.1 0.180 0.430 7.009 0.072 0.247 3.798
¾ 2.2 0.199 0.455 7.187 0.092 0.306 4.063
7
⁄8 2.6 0.296 0.584 8.555 0.151 0.422 6.028
1 3.0 0.427 0.737 9.374 0.270 0.634 7.014
1 1 ⁄8 3.3 0.554 0.849 10.430 0.398 0.799 8.419
Class II
¹ 5 ⁄32 1.4 0.063 0.243 4.499 0.015 0.138 2.434
½ 1.5 0.075 0.267 4.891 0.020 0.167 2.727
¹ 9 ⁄32 1.7 0.115 0.334 5.326 0.025 0.188 2.812
5
⁄8 1.8 0.130 0.357 5.593 0.032 0.225 3.074
23
⁄32 2.1 0.180 0.430 6.504 0.060 0.317 3.781
¾ 2.2 0.198 0.454 6.631 0.075 0.392 4.049
7
⁄8 2.6 0.300 0.591 7.990 0.123 0.542 5.997
1 3.0 0.421 0.754 8.614 0.220 0.812 6.987
1 1 ⁄8 3.3 0.566 0.869 9.571 0.323 1.023 8.388
Structural I
¹ 5 ⁄32 1.4 0.067 0.246 4.503 0.021 0.147 2.405
½ 1.5 0.078 0.271 4.908 0.029 0.178 2.725
¹ 9 ⁄32 1.7 0.116 0.338 5.018 0.034 0.199 2.811
5
⁄8 1.8 0.131 0.361 5.258 0.045 0.238 3.073
23
⁄32 2.1 0.183 0.439 6.109 0.085 0.338 3.780
¾ 2.2 0.202 0.464 6.189 0.108 0.418 4.047
7
⁄8 2.6 0.317 0.626 7.539 0.179 0.579 5.991
1 3.0 0.479 0.827 7.978 0.321 0.870 6.981
1 1 ⁄8 3.3 0.623 0.955 8.841 0.474 1.098 8.377
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Notes:
1. Courtesy, APA—The Engineered Wood Association, “Concrete Forming”, 2004.
2. The section properties presented here are specifically for Plyform, with its special
layup restrictions.
TABLE 9-3 Effective Section Properties of Plyform with 1-ft Widths
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