고체역학 (Gere) — Axially Loaded Members: Problem 2.3-7

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 having 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. 2.3-7 Repeat Problem 2.3-5, but now include the weight of the bar. See Table I-1 in Appendix I for the weight density of steel.