Two channels having a cross section shown carries a tensile load. It has a length of $9$ m and has one line of

three $22mm$ bolts in each channel flange. The center of the bolt holes are $44\mathrm{.}50$ mm from the back of the

channel. Use A $36$ steel. Properties of $C20045$ are $A=5690mm2,d=300mm,bf=80\mathrm{.}52mm,tf=12\mathrm{.}73$

$mm,tw=12\mathrm{.}95mm,rx=108\mathrm{.}97mm,ry=19\mathrm{.}38mm,\stackrel{}{x}=17\mathrm{.}12mm,Ix=67\mathrm{.}4({10}^6)m{m}^4,$ and $Iy=2\mathrm{.}14$

$({10}^6)m{m}^4.$ Compute the capacity of the tension member neglecting the effect of the plates. Calculate the

slenderness ratio of the section. Determine the dimension of the plates. $(35$ points$)$