고체역학 (Gere) — Shear Forces and Bending Moments: Problem 4.5-15

4.5-15 A cantilever beam \( AB \) supports a couple and a concentrated load, as shown in the figure. Draw the shear-force and bending-moment diagrams for this beam. Given values from the figure: Beam length: \( L = 4 \text{ m} \) (\( 2 \text{ m} + 2 \text{ m} \)) Clockwise couple at midpoint: \( M_c = 3 \text{ kN}\cdot\text{m} \) at \( x = 2 \text{ m} \) Downward concentrated load at free end \( B \): \( P = 4 \text{ kN} \) at \( x = 4 \text{ m} \)