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Perforated shear walls require hold-downs at the wall ends only, but a shear capacity reduction factor Co based on the size of the openings is applied. So although perforated walls have a lower shear capacity than segmented walls, they have the advantage of requiring fewer hold-downs.
The factor Co is also applied in creating the uplift anchorage force t, lateral anchorage shear force, and in calculating the Deflection of Perforated Shear Walls and Perforated Shear Wall Hold-down Forces.