(Solved): help!!! The beam shown consists of two steel angles, the allowable bending stresses are \( \sigma_{a ...

The beam shown consists of two steel angles, the allowable bending stresses are \( \sigma_{a l i o w}=20 \mathrm{ksi} \). Neglecting the beam weight, select the most economical L-section that can be used to form the two-angle beam. Assume the two angles act together as one. \( L 6 \times 4 \times 3 / 4 \) \( 16 \times 4 \times 1 / 2 \) \( 16 \times 4 \times 3 / 8 \) \( 15 \times 3 \times 1 / 2 \)