The two steel channels are to be laced together to form a 30-ft-long bridge column assumed...

The two steel channels are to be laced together to form a 30-ft-long bridge column assumed to be pin connected at its ends. Each channel has a cross-sectional area of A = 3.10 in2 and moments of inertia Ix = 55.4 in4, Iy = 0.382 in4. The centroid C of its area is located in the figure. Determine the proper distance d between the centroids of the channels so that buckling occurs about the x-x and y'-y' axes due to the same load. What is the value of this critical load? Neglect the effect of the lacing. Est = 29(103) ksi. σy =50 ksi.