1-The horizontal rigid beam ABCD is supported by vertical bars BE and CF and is loaded by vertical forces P, =400 KN and P2 = 360 KN acting at points A and D, respectively. Bars BE is made of steel (E=210 Gpa) and CF is made of aluminum (E = 72 GPa) and have cross-sectional areas BE = 1000 mm' and CF = 9000 mm 2. The distances between various points on the bars are shown in the figure. Determine the vertical displacements da and do of points A and D, and the point that between points of B and C, respectively.

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A: Dear students

Buckling of columns

The column is described as a vertical member of the structure that carries an axial compressive load, and buckling is a lateral deformation of the column under the application of load.