E. (10 pts.) For the beam shown below: Design the most economical beams and using A992 steel (Fy = 50 ksi) considering moment and shear only. Assume that the beam is simply supported and the point loads provide full lateral support for the compression flange. Given: R=Va = 28.1 kips, and Ma = 183.6 kip-ft SK 5K SK SK SK SK 5 5K 5K SK 5K 50 PLF (ASSUMED BEAM WEIGHT) 2 2 2 2 2 2 2 2' 2 2 24-0" R1-28.1 KIPS R2-28.1 KIPS Show calculation (4 pts.) Zx (4 pts.) Select the most economical W section (W?x?) (2 pts. Check shear: V./02. =