For the plane truss shown in Figure P15–4, bar element 1 is subjected to a uniform tempe...

For the plane truss shown in Figure P15–4, bar element 1 is subjected to a uniform temperature rise of 30 ° F. Let E = 30 × 10⁶ psi, A = 2 in², and a = 7:0 × 10^–6 (in./in.)/ ° F. The lengths of the truss elements are shown in the figure. Determine the stresses in each bar. (Hint: Use Problem 3.21 for [K .)