고체역학 (Gere) — Stresses in Beams (Advanced Topics): Problem 6.3-1

6.3-1 Repeat Problem 6.2-17 but now use a transformed-section approach. (Problem 6.2-17 Reference): Repeat Problem 6.2-1 but now assume that the steel plate is smaller (13 mm × 130 mm) and is aligned with the top of the beam as shown in the figure. (Problem 6.2-1 Reference): A composite beam is constructed using a steel plate (13 mm × 150 mm) with two wood beams (75 mm × 150 mm) on either side. The wood and steel are securely fastened to act as a single beam. The beam is subjected to a positive bending moment \( M_z = 6.75 \text{ kN}\cdot\text{m} \). Calculate the maximum tensile and compressive stresses in the wood and steel if \( E_w = 11 \text{ GPa} \) and \( E_s = 200 \text{ GPa} \).