Problem $2$:

$1($b$)$

A thin$-$walled cantilevered beam has a constant cross$-$section of uniform thickness with the dimensions shown below. It is subjected to a system of point loads acting in the planes of the walls of the section in the directions shown.

Calculate the direct stress according to the basic theory of bending at the points $1,2,$ and $3$ of the cross$-$section at the built$-$in end and halfway along the beam. Illustrate your answer by means of a suitable sketch $($showing whether each analyzed point is in tension or compression$).$