Please explain each step properly and answer both a$)$ and b$),$ including the drawing of purlin:

For the structure shown below, the roof is made of a material with a surface density of $12\mathrm{.}5k\frac{g}{m^2},$ there is a

snow load with an intensity of $2\mathrm{.}0k\frac{N}{m^2},$ and the distance $=6m.$ The purlins have a cross$-$sectional area

of $50m{m}^2$ and are made from a steel with a density of $7850k\frac{g}{m^3}$ find the following:

a$)$ The total uniformly distributed roof load

carried by each purlin along their entire length

$($show a drawing of typical purlin with the

distributed load$).$

b$)$ The concentrated loads transmitted from the

purlins to the truss joints $($show one truss with

the loads$).$

Note: All the purlins are parallel to the

columns $($completely vertical with no

inclination$).$