고체역학 (Beer) — Stress and Strain—Axial Loading: Problem 2.24

2.24 The steel frame (\(E = 200 \text{ GPa}\)) shown has a diagonal brace \(BD\) with an area of \(1920 \text{ mm}^2\). Determine the largest allowable load \(\mathbf{P}\) if the change in length of member \(BD\) is not to exceed \(1.6 \text{ mm}\).