고체역학 (Gere) — Stresses in Beams (Advanced Topics): Problem 6.5-6

6.5-6 The Z-section of Example D-7 is subjected to $M = 5 \text{ kN}\cdot\text{m}$, as shown. Determine the orientation of the neutral axis and calculate the maximum tensile stress $\sigma_t$ and maximum compressive stress $\sigma_c$ in the beam. Use the following numerical data: height $h = 200 \text{ mm}$, width $b = 90 \text{ mm}$, constant thickness $t = 15 \text{ mm}$, and $\theta_p = 19.2^\circ$. Use $I_1 = 32.6 \times 10^6 \text{ mm}^4$ and $I_2 = 2.4 \times 10^6 \text{ mm}^4$ from Example D-7.