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The program calculates an uplift anchorage force t for perforated walls to comply with SDPWS 4.3.6.4.2.1. This force is vmax = V / COSLi (Eqn 4.3-9), where SLi is the sum of the shear wall segments, adjusting for narrow segments as per 4.3.4.3.
The program adds the accumulated t line forces, in plf, from perforated walls on upper levels to one created on a lower level, to comply with SDPWS 4.3.6.4.4.
If perforated wall segments are offset such that the t force from an upper floor is distributed over an opening on a lower floor, then the force is distributed by engineering mechanics as a point force at the support to the opening.
These t point forces are included in the combined overturning force reported in Elevation View and in the Dragstrut and Holddown Table of the design results. They are not combined in such a way to diminish compression forces.
The t line forces can appear over segmented walls or in gaps in the shear line if a perforated wall exists on a floor above at that location.
The line force t is reported only in Elevation View graphics.