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

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Properties of Form Material 61
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, American Plywood Association, “Concrete Forming,” 2004.
2. The section properties presented here are specifically for Plyform, with its special
layup restrictions. For other grades, section properties are listed in the Plywood
Design Specification, page 16 of ref. [3].
TABLE 4-11
Effective Section Properties of Plyform with 1-ft Widths
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