A wood beam of rectangular cross section (see figure) is simply supported on a span of length L. The longitudinal axis of the beam is horizontal, and the cross section is tilted at an angle a. The load on the beam is a vertical uniform load of intensity q acting through the centroid C.
Determine the orientation of the neutral axis and calculate the maximum tensile stress σmax if b = 80 mm, h = 140 mm, L = 1.75 m, a = 22.5°, and q = 7.5 kN/m.