Question $4$:

The I$-$beam AC and the I$-$beam DE are made out of Aluminum $6061-$T$6$ and subjected to $3g$ inertial loading $($not including its own weigth$).$ The E end of beam DE is on top of the beam AC and the distance between them is $d=100mm$ under $0g$ load. I$-$beam geometry and $3$ dimensional orientation of the beam $AC$ and $DE$ is illustrated below.

Find the maximum shear and normal stresses on these structures. Determine whether any one of them fails?

Given:

$L=1\mathrm{.}6m,t=1mm,h=30mm,b=60mm$