2.4-12 The fixed-end bar ABCD consists of three prismatic segments, as shown in the figure. The end segments have a cross-sectional area A1 = 840 mm- and length L1 = 200 mm. The middle segment has a cross-sectional area A2 = 1260 mm and length L2 = 250 mm. Loads PB and Pc are equal to 25.5 kN and 17.0 kN, respectively. (a) Determine the reactions Ry and Ro at the fixed supports. (b) Determine the compressive axial force Foc in the middle segment of the bar. A1 A2 A1 PB Pc A D B C LI L2 L1 PROBLEM 2.4-12