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Effective Area
The effective area Aeff used to determine the slenderness ratio Cc, and axial compressive resistance Pr is that of the fire-reduced cross section. Refer to O86 8.4.5 - Axial Compressive Design for Wall Panels for a an explanation of these values.
Effective Moment of Inertia
The effective moment of inertia Ieff used for the slenderness factor is calculated using the reduced section. Refer to O86 8.4.5 - Axial Compressive Design for Wall Panels.
Out-of-Plane Deflection
The value of the out-of-plane deflection used for combined axial and bending includes the load eccentricity, that is, the distance from the location of the axial load to the centroid of the fire-reduced section. For this reason, combined-axial-and-bending compression design is always calculated for fire design, even when there was initially no load eccentricity or lateral loads.