13-9. A column is constructed using four A992 steel angles that are laced together as shown. The length of the column is to be 25 ft and the ends are assumed to be pin connected. Each angle shown below has an area of A = 2.75 in 2 and moments of inertia of I x = I y = 2.22 in 4 . Determine the distance d between the centroids C of the angles so that the column can support an axial load of P = 350 kip without buckling. Neglect the effect of the lacing | |
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