Problem $1$

For the frame below, assume $EI$ is constant, that $A$ is a roller support and that $C$ is a fixed support. In addition, assume the beams and columns are axially rigid.

$($e$)$ Compute the displacement underneath the concentrated load, ${}_D.$

$($f$)$ Compute the horizontal displacement at $B,{}_B.$

$($g$)$ Compute the rotation at $B,{}_B.$