고체역학 (Beer) — Shearing Stresses in Beams: Problem 6.92

6.92 Two W8 × 31 rolled sections may be welded at A and B in either of the two ways shown to form a composite beam. Knowing that for each weld the allowable shearing force is 3000 lb per inch of weld, determine for each arrangement the maximum allowable vertical shear in the composite beam.