A steel beam of I-section (see figure) is simply supported at the ends. Two equal and oppositely

Question:

A steel beam of I-section (see figure) is simply supported at the ends. Two equal and oppositely directed bending moments M0 act at the ends of the beam, so that the beam is in pure bending. The moments act in plane mm, which is oriented at an angle a to the xy plane.
Determine the orientation of the neutral axis and calculate the maximum tensile stress smax due to the moments M0. Data for the beam are as follows: S 200 x 27.4 section, M0 = 4 kN m., and Î± = 24°.