9-57. Three bars cach made of different materials are connected together and placed between two walls when the temperature is Ti = 12 "C. Determine the force exerted on the (rigid) supports when the temperature becomes T; = 18 "C. The material properties and cross-sectional arca of cach bar are given in the figure. Copper E- 120 GPa a- 12(10"/c r = 21(10y"C aa = 17(10c Steel Вrиs - зо сра F- 100 GPa A- S15 mm? A = 200 mm Aar- 450 mm? -300 mm- -200 mm- 100 mt

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