Example

Calculate the effective width of the compression flange of the box section (Figure 6.12) to be used as a beam bending about the x-axis. Use Fy = 33 ksi. Assume that the beam webs are fully effective and that the bending moment is based on initiation of yielding.

Solution

Because the compression flange of the given section is a uniformly compressed stiffened element, which is supported by a web on each longitudinal edge, the effective width of the flange for strength determination can be computed by using Equations 6.6 through 6.9 with k = 4.0.

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