고체역학 (Gere) — Stresses in Beams (Advanced Topics): Problem 6.4-14

6.4-14 A cantilever beam built up from two channel shapes, each UPN 180 and of length L, supports an inclined load P at its free end (see figure). Determine the orientation of the neutral axis and calculate the maximum tensile stress \(\sigma_{max}\) due to the load P. Data for the beam are \(L = 4.5\text{ m}\), \(P = 500\text{ N}\), and \(\alpha = 30^\circ\).