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 α = 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 .)
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