고체역학 (Beer) — Shearing Stresses in Beams: Problem 6.74

6.69 through 6.74 Determine the location of the shear center $O$ of a thin-walled beam of uniform thickness having the cross section shown. [Figure P6.74 shows a semi-circular arc of radius $a$ and thickness $t$. The shear center $O$ is at a distance $e$ from the center $C$ of the arc.]