A structure has the geometry shown below. The bar BC has the cross-section shown; the material is 6061-T6 aluminum alloy. It is pinned at each end such that it sees no bending or twisting. Assume that the horizontal beam is rigid and the connections are adequate. Size of the horizontal beam (W 18 x 60 in x lb/ft). Utilizing the maximum distortion energy theory with a factor of safety of 2, what is the maximum force, that the structure can carry?