For The Plane Truss Shown In Figure P15 9 Bar

For the plane truss shown in Figure P15 -9, bar element 2 is subjected to a uniform temperature rise of T = 10 °C. Let E = 210 GPa, A = 12.5 cm2, and α = 12 × 10-6/°C. What temperature change is needed in bars 1 and 3 to remove the stress due to the uniform temperature rise in bar 2? Show enough work to prove your answer. Use a longhand solution.

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