고체역학 (Gere) — Axially Loaded Members: Problem 2.3-4

2.3-4 A vertical bar consists of three prismatic segments \(A_1\), \(A_2\), and \(A_3\) with cross-sectional areas of \(6000\text{ mm}^2\), \(5000\text{ mm}^2\), and \(4000\text{ mm}^2\), respectively. The bar is made of steel with \(E = 200\text{ GPa}\). Calculate the displacements at points \(B\), \(D\), and \(E\). Ignore the weight of the bar.