고체역학 (Gere) — Stresses in Beams (Basic Topics): Problem 5.6-18

5.6-18 A beam having a cross section in the form of a channel (see figure) is subjected to a bending moment acting about the z axis. Calculate the thickness t of the channel in order that the bending stresses at the top and bottom of the beam will be in the ratio 7:3, respectively. Given values from the figure: Overall width: 152 mm Overall height: 55 mm The thickness t is constant for the web and the flanges.