$21-6$: For the support and load conditions shown in the figure below, select the lightest available section

using A$992$ steel. Lateral bracing is provided at each concentrated load and at the end supports of

the beam. Use the AISC Beam Charts $($Table $3-10)$ to select the section but verify the selection

using the appropriate Chap. F equations. Can scan in handwritten shear and moment diagrams.