고체역학 (Gere) — Axially Loaded Members: Problem 2.3-5

2.3-5 A vertical bar is loaded with axial loads at points B, C, and D, as shown in the figure. The bar is made of steel with a modulus of elasticity \( E = 200 \text{ GPa} \). The bar has a cross-sectional area of \( 5300 \text{ mm}^2 \). Calculate the displacements at points B, C, and D. Ignore the weight of the bar.