고체역학 (Gere) — Axially Loaded Members: Problem 2.5-6

2.5-6 A beam is constructed using two angle sections (L $120 \times 80 \times 10$) arranged back to back, as shown in the figure. The beam is fixed at joint A and attached to an elastic support having a spring constant $k = 1750\text{ kN/m}$ at joint B. Assume only the beam is subjected to temperature increase $\Delta T = 45^\circ\text{C}$. Calculate the thermal stress developed in the beam and the displacement at point B. Assume that $\alpha = 12 \times 10^{-6}/^\circ\text{C}$. Let $E = 205\text{ GPa}$.