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Implicit in the hold-down displacement term of the deflection equation are the tensile and compressive forces T and C in the end chords and hold-downs. The tensile force is used to calculate hold-down displacement resulting in rotational deflection of the shearwall, and the compression force used to calculate wood crushing under the end studs.
These forces include contributions from shear overturning from the shear force v on the wall segment being analyzed, as well as contributions from the dead and wind uplift loads and from shear overturning on levels above. The latter contributions are constant with respect to v, which has implications for the distribution of shear force to the wall segments that is discussed in Force Distribution to Equalize Deflections.
The seismic and wind load combinations used to calculate these forces are described in Shear Force in Sheathing for the shear overturning and wind uplift component and in Dead Load Hold-down Component for the dead component.