고체역학 (Beer) — Stress and Strain—Axial Loading: Problem 2.50

2.50 The concrete post (\(E_c = 3.6 \times 10^6\) psi and \(\alpha_c = 5.5 \times 10^{-6} / ^\circ\text{F}\)) is reinforced with six steel bars, each of \(7/8\)-in. diameter (\(E_s = 29 \times 10^6\) psi and \(\alpha_s = 6.5 \times 10^{-6} / ^\circ\text{F}\)). Determine the normal stresses induced in the steel and in the concrete by a temperature rise of \(65^\circ\text{F}\).