As shown in the figure, two steel bars $BE$ and $CF(E=220$GPa,$A_{BE}=11800m{m}^2,A_{CF}=9220m{m}^2)$ support the rigid bar ABCD. Two

vertical forces $P_1=360kN$ and $P_2=320kN$ act on the two ends $($point A and point $B$ of the beam$).$ Determine the vertical displacement at point

A and $D,$ respectively. Use a negative sign to indicate downward displacement, if applicable.

${}_A=,$

${}_D=,mm$

${}_0$