6. Select the lightest steel wide-flange section (W33 shape) for the beam shown. Assuming

that flexure controls the design (moment controls the design). Do not consider beam

weight. The allowable bending stress is 30 ksi (Fb = 30 ksi). Given: E = 29,000 ksi

R₁ = 55.25 kips

+55.25

0

50 kips

+

18'-0"

-12.75

30-0

-1 kip/ft

+37.25

832.5

B

Load diagram

R = 42.75 kips

0

Shear (V) diagram

(kips)

-42.75

Moment (M) diagram

0 (fl-kips)