I need help regarding this problem, i had diffuculty in answering this particular question, please do exlain in details so i can understand, thank you in advance. p$.$s$.$ i will like after if answering is fast. The attached figure illustrates a braced bay with tension$-$only bracings subjected

to wind loads at each story level. Bracings at both stories are made with double angles $($Long

Leg Back to Back, LLBB$).$ Unequal leg angles made of S$235$ steel are connected to a

sufficiently thick gusset plate through six M$16$ bolts in standard holes. Wind loads, F F

$F_{w2},$ are shown in the figure. The factored tension load developed in the first story bracing

due to lateral and gravity loads is estimated as $T_u=500kN.$ Using LRFD find the followings:

$($a$)$ Select a trial section, $2$L$150$x$....$ x$...,$ considering yielding in gross section;

$($b$)$ Check if the trial section is adequate. If not, redesign.