L = 240 in, d = 27.125 in from Example Problem a, and
arm = b/2
= 18/2
= 9.0 in offset from centerline of beam
240
Tu = ( - 27.125) x 320 x 9
2
= 267,480 in-lb
(2) Determine maximum torsional stress using Equation (47a>,
since h > b.
(3) Use Equations (48) and (49) to find shear and torsional
capacity of unreinforced web.