12. The W460 x 113 beam is loaded with three forces as shown below. There is a pin support at A and a roller support at B. a. Calculate the

reaction forces at A and B. b. Sketch the shear diagram and bending moment diagram for the beam. Include shear (V) and bending moment (M) values on the diagrams. c. Calculate the maximum normal stress in the beam.

Fig: 1

Fig: 2

Fig: 3

Fig: 4