고체역학 (Beer) — Pure Bending: Problem 4.100

4.100 A small post \( DE \) is supported by a short \( 10 \times 10 \text{-in.} \) column as shown. In a section \( ABC \), sufficiently far from the post to remain plane, determine the stress at (a) corner \( A \), (b) corner \( C \).