Problem $15\mathrm{.}16$ Determine stirrup spacing at distance d from support for the beam shown if the load is acting $100$ mm off

center of the beam. Assume the torsion at the support equals the uniform load times $100$ mm$,$ f c $=28$ MPa, and

fy $=420$ MPa. Use #$13$ stirrups and assume that the torsion and shear vary from a maximum at the support to zero at the

beam centerline. Clear cover $=40$ mm