Question $5$

a$.$ Define a column.

$[2$ marks$]$

b$.$ Explain why I$-$section is one of the most efficient shapes to use as a column.

$[3$ marks$]$

c$.$ A L$-$section will be used as a struct and designed to a height of $12ft.$ The L$-$section is $250mm$ thick and has lengths of $400$ and $800mm.$

The elastic modulus given as $210k\frac{N}{m}{m}^2.$ Calculate:

i$.$ The critical load in the column if one end fixed and the other pinned. $(12$ marks$)$

ii$.$ The critical stress developed

$(3$ marks$)$

iii. Slenderness ratio

$(5$ marks$)$