Initially at room temperature of 20 C and with P= 0 kN, the gap between C and the rigid wall at D is 1.5 mm. The temperature of the assembly is raised to 80 C and at this point the force P = 200 kN is applied. The assembly is made of steel and has a modulus of elasticity Estl = 207 GPa and a linear coefficient of thermal expansion = 11.7 10-6 /C. a) Determine the final support reactions at A and D. b) The final axial stress and strain in members AB and BC. NOTE: Neglect the thickness of the flanges