Combined Shear and Nail Slip Deflection

The three-term deflection combines the shear and nail slip terms

with

where the formula for G_a is adapted from the American Wood Council's Special Design Provisions from Wind and Seismic (SDPWS), Equation C4.2.2-3 as

where v_CAP is the force using serviceability load combinations (SLS) at the point where the shear wall is at capacity using ultimate limit state combinations (ULS). For wind design

where

• 0.75 is the SLS importance factor for wind design,
• 1.4 is the load combination factor for wind design,
• I_W is the ULS importance factor for wind design, which can vary based on building occupancy.
• V_rs is the factored segment capacity from O86 11.6.2.2
• L_s is the segment length

For seismic design, it is

where I_E is the ULS importance factor for wind design.