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### Wood Shear Stress Formulas and Calculator

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**Structural Design Engineering Resources **

Wood Shear Stress Design Formulas and Calculator

The actual shear stress parallel to grain induced in a sawn lumber, structural glued laminated timber, structural composite lumber, or timber pole or pile bending member shall be calculated as follows:

Preview: Wood Shear Stress Design Calculator

Eq. 1

f_{v} = V · Q / ( I · b )

For a rectangular bending member of breadth, b, and depth, d, this becomes:

*Eq. 2
f _{v} = 3 · V / ( 2 · b · d ) *

Where:

*f _{v} =* actual shear stress parallel to grain, psi

*= Shear force, lbs*

V

V

*statical moment of area about the neutral axis, in*

Q =

Q =

^{3}

*I*= area moment of inertia in

^{4}

*b*= breadth (thickness) of rectangular bending member, in.

*d*= depth (width) of bending member, in.

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Source:

National Design Specification for Wood Construction, 2017