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Walls are generally not designed for out-of-plane bending to avoid excessive longitudinal reinforcement. In this case, use a small modifier say 0.1 for m11, m22 and m12 so numerical instabilities could be avoided. However, use m11, m22, m12 = 0.70 (or 0.35) when considering the out-of-plane bending in wall.
PCI Report p.19 said:The strength design of a load-bearing sandwich panel is the same as for compression members as described in section 5.9 of the PCI Design Handbook. Secondary moments associated with slenderness effects are the moments caused by the eccentricity of axial loads due to deflections resulting from wind and seismic or gravity forces, and out of plumbness resulting from erection tolerances and bowing. These secondary effects can be accounted for in the panel design by using the moment magnification method or the second order (P-∆) analysis as described in section 5.9.3 of the PCI Design Handbook. The stiffness reduction factor (φ-k) is assumed to be at least 0.85, ...