Biaxial bending of short columns
For most columns, biaxial bending will not govern the design. The loading patterns necessary to cause biaxial bending in a building's internal and edge columns will not usually cause large moments in both directions. Corner columns may have to resist significant bending about both axes, but the axial loads are usually small and a design similar to the adjacent edge columns is generally adequate.
A design for biaxial bending based on a rigorous analysis of the cross-section and the strain and stress distributions would be done according to the fundamental principles of chapter 4. For members with a rectangular cross-section, separate checks in the two principal planes are permissible if the ratio of the corresponding eccentricities satisfies one of the following conditions:
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