Demonstrate the calculations required $($to Eurocode $3)$ to check the resistance against yielding of the gross cross$-$sections and ultimate failure of the net cross$-$section for a welded and a bolted unequal angle arrangement.

$($a$)$ Design a single angle tie, using grade $S355$ steel, for the member AB shown in Figure $2.$ Consider a bolted and a welded arrangement.

Figure $2$: Tension member $AB$ in truss

Tensile force in member $AB$ : Dead load and $b$ are the last two digits of $($any$)$ of the group's student numbers. For example, for the student number $160072938,$ it is $a=3$ and $b=8$ and the total Dead load is $138kN.$ You have to explicitly state the student number you are using $($with the corresponding student name$)$ on the first page of answering Q$2.$ Variable $($imposed$)$ load Qk $=200kN+$abkN $($same as above$).$

$($a$)$ Try a $1257510$ unequal angle with cross sectional area of $1920mm,$ welded by the

$($b$)$ Try a $1507510$ unequal angle with cross sectional area of $2170mm.$ holted $($with a line of four $22mm$ HSFG bolts, at $125mm$ centres$)$ through the longer leg.