1.21) Figure 1.21 shows a light pin-jointed structure with members AC, BC and CD of length L and members AB and BD inclined at 45. It is loaded with a distributed load as shown across AC, a moment at C and a force 3P horizontally half-way along BD. Find the support reactions and the forces in members BC and CD. B 3P 5P/L D A 2PL L/2 L/2 Figure 1.21