The horizontal rigid beam ABCD is supported by vertical bars BE ad CF and is loaded

by vertical force $P1=400kN$ and $P2=360kN$ acting at points A and D $,$ respectively

$($see figure$).$ Bars BE and CF are made of steel $(E=200$GPa $)$ and have cross$-$sectional

areas $A_{BE}=11,100m{m}^2$ and $A_{CF}=9,280m{m}^2.$ The distances between various points on

the bars are shown in the figure. Determine the vertical displacements ${}_A$ and ${}_D$ of

points A and D$,$ respectively.

$($rigid beam$)BECF$

$E=200$GPa $A_{BE}=11,100m{m}^2$ and $A_{CF}=9,280m{m}^2.$

$AD$