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The length bs is the length of the shear resisting elements, between the outer edges of the end stud assemblies.
Perforated Shear Walls
For perforated shear walls, as per SDPWS 4.3.2.1, the length bs is the sum of the lengths of the full-height segments, and one deflection is calculated for the entire wall. Note that the summation of full-height segments is also adjusted for narrow segments as per 4.3.3.5.
Force-transfer Walls
For force-transfer walls, the length bs used in the deflection equation is the length of the full-height segments between wall openings, however, one deflection is calculated for the entire wall by averaging the segment deflections as described in Deflection of Force-Transfer Walls.