NDS C3.7.1 - Alternative Stability Factor for CLT Wall Panels

The Stability Factor CP for CLT Wall panels is given in NDS Commentary C3.7.1.4, Equations C3.7.1-1 to -4. This equation is also in the CLT Handbook, Chapter 8, Section 4.1.4.1, Equation 16.

where

• P_c^* = F_c^* A_eff = axial compressive resistance
• F_c ^* = F_c factored with all adjustment factors except C_P
• c = 0.9 for CLT
• P_cE = π² (EI)_app-min’ / L_e²

L_e is the effective length between lateral supports, which is usually K_eL for wall panels, L being the panel height, and (EI)_app-min is described in NDS 10.4.1 - CLT Stiffness .

The column buckling resistance P_cE is also required for for CLT combined axial and bending design.