From Figure $2,$ where the roof frames are $6$ meters apart, with a dead weight of $5k\frac{g}{m^2},$ a live load of $30k\frac{g}{m^2},$ and an additional dead load of $20k\frac{g}{m^2},$ design using hollow round steel type A$36($Fy $=2500k\frac{g}{c}{m}^2,Fu=4000k\frac{g}{c}{m}^2)$:

$2\mathrm{.}1$ Design the top and bottom cords.

$2\mathrm{.}2$ Design the web and diagonal parts.

$2\mathrm{.}3$ Check the deflection at the center of the beam