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The shear capacity adjustment factor Co is applied to the tabulated shear capacities for perforated walls. In the Design Settings, you can choose between using SDPWS Equations 4.3-5 and 4.3-6, and using Table 4.3.3.5 to calculate this factor.
Co depends upon the ratio of the total length of full-height sheathing to the total length of the wall. Using the Table, the maximum opening height the wall is also required; using the Equations, the total area of openings is used. The values in the Table are arrived at by using the maximum opening height as the height of each opening, and is thus a conservative approximation of the Co arrived at via the Equations.
Since Co is determined on a wall-by-wall basis, rather than on a shear line basis, it is possible for walls on the same shear line to have different Co values. If some design values are unknown, the program designs for the wall with the critical combination of Co factor and applied force.
In the design results by shear line, the program reports the design results for the wall with the lowest Co. For design results by individual shear walls, the program reports the strength of the wall reduced by the Co for the actual wall.