Question $2(20$ Points$)$:

a$)$ Calculate the axial force capacity $(Nr)$ of the

slender cantilever column, whose cross$-$

section is given in the figure, under the

effect of horizontal and vertical. $(=1\mathrm{.}23)$

b$)$ Explain without calculating how the axial

force bearing capacity $(Nr)$ will change

$($increase$/$decrease$)$ if the horizontal force

shown in the figure acts in the $y-$y direction.

Materials: C$30/$S$420$

$\frac{d^{\text{'}}}{h}=0\mathrm{.}1$