$$

Q$.3$ A frame ABCD is shown in Figure Q$\mathrm{.}3.$ Joint $B$ is a rigid joint and joint $C$ is an internal hinge of the frame.

$($a$)$ Determine the support reactions.

$(9$ marks$)$

$($b$)$ Draw the axial force diagram with calculations.

$(12$ marks$)$

$($c$)$ Draw the shear force diagram with calculations.

$(12$ marks$)$

$($d$)$ Draw the bending moment diagram with calculations.

$(12$ marks$)$