Question Three

$[20$ marks$]$

The pin$-$jointed truss shown in Figure $3$ has a hinge support at A and a roller support at G$.$ Two $12kN$ and $15kN$ forces are suspended at joints $B$ and $E$ respectively.

$($a$)$ Calculate the support reaction components at A and $G$

$($b$)$ Calculate the magnitude and sense of the member forces $AA,AB$ and GL using joint resolution

$($c$)$ Calculate the magnitude and sense of the member forces CD$,$ CJ and I using the method of sections

$($d$)$ Calculate the magnitude and sense of member force DJ