Question

A rigid bar ABCD is suspended from the ceiling by two initially unstressed rods BHE and CF as shown in the figure. The rigid bar ABCD is in the position shown in the figure without any force applied and at an initial temperature of 25°C. Neglect the weight of all the members. 70 cm i 80 cm . 1 15 cm 20 cm 110 cm F- 8 kN Given: 1, Youngs modulus of the rods: EBE = 220 GPa, ECF = 90 GPa 2. Cross-sectional area of the rods: ABE 8 cm2, Ac 6 cm2 3. Thermal coefficient of the rods: ???-13x10-6/°C, ac: 23x10-6/°C If the common temperature of the rods is increased from the initial temperature of 25°C to a final temperature 85°C and a force F is applied at point D Calculate (a) The thermal strain in each rod. (b) The force in each rod. (c) The elastic strain in each rod. (d) The total strain in each rod. (e) The change of length of each rod.Mainly need help with part (b) please.

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