The fixed-end bar ABCD consists of three prismatic segments, as shown in the figure. The end segments have cross-sectional area A1 = 840 mm2 and length L1 = 200 mm. The middle segment has cross-sectional area A2 = 1260 mm2 and length L2 = 250 mm. Loads PB and PC are equal to 25.5 kN and 17.0 kN, respectively.
(a) Determine the reactions RA and RD at the fixed supports.
(b) Determine the compressive axial force FBC in the middle segment of the bar.

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A? Ai P8