In-plane Anchorage Shear Force

According to SDPWS 4.3.6.4.1.1 the maximum shear force v_max that occurs in the transfer of shear force from the upper diaphragm to the perforated shear wall full height segments at the top of the wall, and the full-height-segments to the lower diaphragm a the base of the wall is

v_max = V / C_OS b_i

where

• V is the force on the perforated shear wall
• C_o is the perforated shearwall shear capacity adjustment
• S b_i is the sum of full height segment lengths adjusted for narrow segments as per 4.3.3.4.

This is the same as applying a factor of

S b / C_OS b_i

to the shear wall design shear v to arrive at a maximum shear force used to design nails or bolts anchoring the shear wall at the top and bottom. This factor takes into account the concentration of forces in certain segments that can occur in perforated shear walls.

Shearwalls shows the v_max force used for in-plane anchorage design at the bottom of the wall in Elevation view if you select For anchorage and drag struts in Show/Hide menu. v_max is also shown in the Shear Design table of the Design Results.