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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 Gvtv
The value for shear stiffness Gvtv is taken from SDPWS Table C4.2.2A for wood structural panels and C4.2.2B for all other materials. The Sheathing Grades portion of the table is used, in accordance with Note 1 of the table.
In order to access table C4.2.2A, there are inputs in wall Input view for panel span rating, number of plies, and whether the panel is OSB.
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.