Civil Engineering Reference
In-Depth Information
Figure 20.4
The normal framing applications of plyform are for wet conditions, and adjustments
in allowable stresses should be made for those conditions as well as for duration of load
and other experience factors. As a result of these items, the following allowable stresses
are normally given for plyform:
Class I
Class II
Structural I
plyform
plyform
plyform
Modulus of elasticity (psi)
1,650,000
1,430,000
1,650,000
Bending stress (psi)
1930
1330
1930
Rolling shear stress (psi)
80
72
102
Table 20.3 shows allowable bending stresses, allowable compression stresses perpen-
dicular and parallel to the grain, allowable shearing stresses, and moduli of elasticity for
several types of lumber often used in formwork.
