Rigid bar $\mathrm{AD}$ is pinned at $\mathrm{A}$ and supported by bars $\left(1\right)$ and $\left(2\right)$ at $\mathrm{B}$ and $\mathrm{C}$, respectively. Bar $\left(1\right)$ is aluminum and bar $\left(2\right)$ is brass. A concentrated load $\mathrm{P}=36 \mathrm{kN}$ is applied to the rigid bar at $\mathrm{D}$.

Compute the normal stress in each bar and the downward deflection of the rigid bar at $\mathrm{D}$.