고체역학 (Beer) — Shearing Stresses in Beams: Problem 6.8

6.8 The composite beam shown is fabricated by connecting two W6 × 20 rolled-steel members, using bolts of 5/8-in. diameter spaced longitudinally every 6 in. Knowing that the average allowable shearing stress in the bolts is 10.5 ksi, determine the largest allowable vertical shear in the beam.