The cross$-$section of the column is a rectangle with dimensions $120$ mm x $200$ mm$.$

The column built into the ground has length, L $=2\mathrm{.}8$ m$,$ and is under axial compressive load P$.$

Use $=2\mathrm{.}0.$

Calculate:

i$.$ The critical $($Euler$)$ load to buckle the column.

$(5$ marks$)$

ii$.$ If the factor of safety is F$.$S$.=2\mathrm{.}0,$ what is the allowable buckling load?

$(2$ marks$)$

Question $3$b

The Universal Column $250$UC$72\mathrm{.}9$ is used to construct a column with height of $8$ m and fixed at base

and pinned at top.

Determine the total critical $($Euler$)$ load. $=200$a Question $3$a

The cross section of a column built up of a timber section $(\backslash (\backslash$mathrm$\{$E$\}=13\backslash$mathrm$\{$GPa$\}\backslash ))$ is shown in Figure below.