In this equation effective shear modulus GAeff is calculated using the Shear Analogy Method, given in O86 8.4.3.2 and. CLT Handbook 3.3.1, Equation 25.
GAeff = a2 / b ∑ α i t i / Gi
where the summation i is over all the layers and
a is the distance between the midpoints of the outermost layers,
b is the one-foot arbitrary design width.
α i = ½ for the outermost layers and 1 for the inner layers
t i is the thickness of the layer
for layers parallel to loading, Gi = G = Ei/16 (O86 Table 8.2
, Note 4)
for layers transverse to loading, Gi = G /10 (O86 Table 8.2
, Note 5)
Double Outermost Layers
Double outermost layers are treated as a single layer in this calculation.
