Question $3$

A pin$-$ended aluminum $(E=70$GPa $)$ column with length $L=2\mathrm{.}5m$ is under axial

compressive load $P$ as shown in Fig. Q$3.$ The dimensions of the cross$-$section are $b=200mm$

and $d=250m.$ Using a factor of safety of $2\mathrm{.}0,$ determine the allowable buckling load.

Fig. Q$3$