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The second term of the 4-term equation relates to the in-plane shear deformation of the shear wall.
Shear Stiffness Bv
The value for shear –through –thickness rigidity Bv is taken from Table 9.3A-C in CSA O86, and from the USA SDPWS Table C4.2.2B for gypsum wallboard.
Shear Value v On Either Side of Wall
Refer to Distribution to Sides of Composite Wall for an explanation of how shear is apportioned to each side of a wall with different sheathing materials on either side of the wall.