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Once the applied loads are distributed to the shear lines, the shear line forces are used to calculate several secondary shear force values at appropriate locations. It reports these in Plan view, Elevation view and/or in the Design results, and uses them for various aspects of design:
Shear Line Force V
The total shear line force V is the shear point force acting at the top of the wall, in pounds or kN. This is the only force shown in plan view. It is also given in the design results and shown in Elevation view at the top left or right of the shear line.
Shear Wall or Segment Force V
The force V on each wall or wall segment is shown in Elevation view at the top of the wall. For segmented walls, it is shown at each full-height segment; for perforated and force-transfer walls, at the end of each wall. It is also shown in the Shear Design table of the design results output. These forces are determined as described in Horizontal Force Distribution Within Shear Line, and are used to determine the unit design shear force v as described below.
Diaphragm Force v
The unit diaphragm shear v is the force density per lineal foot or meter that exists in the diaphragm chord at the top of the wall. It is simply V divided by the length of the shear line. This assumes the shear line is the same length as the diaphragm. This is shown in Elevation view at the top of the wall line. This force is used to determine drag strut forces and in the shear distribution to force-transfer wall piers.
Design Shear Force v
The unit design shear v is design shear force density in the sheathing of the shear-resisting wall segments, used for shear wall design, hold-down force calculations, drag strut force calculations and deflection calculations.
For segmented walls, it is V divided by the length of the wall segment and is shown at the bottom of the each full-height segment.
For perforated walls, it is V divided by the sum of the lengths of full-height sheathing segments in the wall. It is not shown in Elevation view; vmax appears instead at the bottom of the wall (see below).
For force-transfer walls, the force in each pier (rectangular areas above, below, and beside openings) is shown at the bottom of each pier. Refer to Shear Force Distribution within Force-transfer Walls for the calculation of this force.
This force is also shown in the Shear Design and Deflection tables of the Design Results output.
In-plane Anchorage vmax
For perforated walls, the value of vmax from SDPWS 4.3.6.4.1.1 is shown in elevation view in place of v at the bottom of the wall, and in the design results it is listed in addition to v.
This force is used for collector design (drag struts) and lateral forces on anchorages connecting the top and bottom of the wall to the diaphragms above and below. It is not applicable to shear wall design. Refer to Lateral Anchorage Shear Force for more details.
Uplift Anchorage t
For perforated walls, upward arrows at the base of elevation view show the vertically accumulated anchorage force t from SDPWS 4.6.4.2.1. It is based on the in-plane anchorage force vmax on each level. Refer to Uplift Anchorage Force t for more details.