The box beam shown in Figure is to be made from No. 1 grade southern pine. It is to be 14...

The box beam shown in Figure is to be made from No. 1 grade southern pine. It is to be 14 ft long and carry two equal concentrated loads, each 3 ft from an end. The beam is simply supported at its ends. Specify the maximum allowable load for the beam to be safe in both bending and shear.

 FIGURE