Vrs Due to Nail Strength

The unit shear resistance governed by sheathing-to-framing connection strength is given in O86 11.6.2.2.(a) as

v_rs = V_rs / L_s = f v_d J_D n_s J_us J_s J_hd

Safety Factor f

f = 0.8.

Unit shear strength v_d

Unit lateral shear strength v_d = N_u/s, where N_u is the factored unit lateral nail resistance from O86 12.9.3.1. Note that the modification K-factors are included in the factored nail resistance N_u so do not appear directly in the equation for V_rs

J_D Factor for Diaphragm and Shear Wall Construction

As per 12.9.3.1 1 factor is always set to 1.3 for shear wall design.

Number of Shear Planes n_S

As mid-panel shear walls are not to be included in Shearwalls, the value of n_s is always 1.

Unblocked Factor J_us

Refer to Unblocked Factor Jus and Unblocked Wall Design

Spacing Factor Js

As per 11.5.1, the fastener spacing factor J_s is applied to each side of a wall with wood structural panel sheathing and lumber framing. This factor is

J_s = 1 - [( 150 - s ) / 150]^4.2

Shearwalls applies this factor as is to other framing materials such as structural composite lumber ( LVL, LSL, etc.). If you are using these framing materials, it is your responsibility to check the proprietary product literature for the adjustment factor for the material, as recommended in the Note to 11.5.1 and make the necessary adjustments to shearwall capacity manually.

Hold-down Effect Factor J_hd

Refer to Hold-down Effect Factor Jhd.