For the one-dimensional steel bar fixed at each end and subjected to a uniform temperature drop of T = 20 ° C as shown in Figure P15–2, determine the reactions at the fixed ends and the stress in the bar. Let E = 210 GPa, A = 1 × 10–2 m2, and a = 11.7 × 10–6 (mm/mm)/ ° C.
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