Biaxial Bending of Columns

If column loads cause bending simultaneously about both principal axes of a column cross-section, as for most corner columns, a biaxial bending analysis is required.
For rapid preliminary design, Eq. (9.99) gives conservative results

The linear solution always gives a safe design, but becomes somewhat overconservative when the moments Mx and My are nearly equal. For these cases, a more exact solution will be more economical for the final design.

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