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Flitch Beam Shear

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I am looking at a Flitch beam composed of 2-2x10's sandwiched around 1/2" plywood. The wood is Southern Yellow Pine No. 2 Dense KD 19.
 
For ordinary sawn lumber, the allowable horizontal shear stress is 90 psi. What is the allowable shear stress for this Flitch beam? Is it the same as sawn lumber or is it more?
 
Randy Russ, P.E.
Russ Engineering
Baton Rouge, La.