Question $3(20$ points$)$

Select the most economical Circular Hollow Section $($CHS$)$ from the table below for tension member AB resisting the given loads. Use ASD design and section area as effective section area.

Given:

Steel material S$355$: $F_y=355$MPa and $F_w=470$MPa

Factor of safety for yielding ${}_t=1\mathrm{.}67,$ and rupture ${}_H=2\mathrm{.}0$

$($note: most economical $=$ lightest section $=$ lowest section area$)$

$\backslash$table$[[$Section Kame,$d_{(mmi)},,A$

Section Area

$(m{m}^2),\backslash$table$[[1y=r_2$