Problem 1 (30 points) The structure shown in Figure la is supported by two external pins (at A and D) and one internal pin (at B) and loaded as shown. a) Write the equations you would use to find the reactions at A and D and at the internal pin. You do not need to solve but you need to number the equations and draw the appropriate FBDs. Given the dimensions, loading values and reactions at A and D shown in Figure 1b: b) Find the internal forces (axial force, shear force, and bending moment) in segment BC in terms of the coordinate x. Draw the shear force and bending moment diagrams for segment BC. w 2 1.5 kN/m x c c D 10 kN 3m 6kNm 7.65 k N 11.65 7.65 D 11.85 kN Figure la Figure 1b