A closed stringer$-$web cross$-$section with three stringers and three webs

is shown in Figure $1.$ The area of stringer #$1$ is A$,$ the area of stringer #$2$ is $2$A$,$ and the area of

stringer #$3$ is $3$A$.$ The overall dimensions of the cross$-$section are given on the figure in terms a

length h$.$ The y$-$z coordinate system has its origin at the centroid C of the cross section and is

oriented as shown. $($Note that the centroid C is not located to scale on the figure.$)$ The cross$-$

section shown in the figure is subjected to a bending moment My in the negative y$-$direction, as

shown