고체역학 (Gere) — Axially Loaded Members: Problem 2.2-8

2.2-8 A device consists of a horizontal beam \(ABC\) supported by two vertical bars \(BD\) and \(CE\). Bar \(CE\) is pinned at both ends but bar \(BD\) is fixed to the foundation at its lower end. The distance from \(A\) to \(B\) is 600 mm and from \(B\) to \(C\) is 350 mm. Bars \(BD\) and \(CE\) have lengths of 350 mm and 450 mm, respectively, and their cross-sectional area is \(720\text{ mm}^2\). The bars are made of steel having a modulus of elasticity \(E = 200\text{ GPa}\). If load \(P\) is 20 kN, calculate the displacement at point \(A\).