Part of a two story building is shown in the figure in which a concerte column and a steel column are used in the first and second floor. The compressive force on the roof of the second floor is PC = 370 kN. The compressive force on the first floor is PB = 420 kN. The steel [Esteel = 200 GPa] column is a wide angle steel shape that has a cross section area of A2 = 1950 mm2. The concrete [Econcrete = 30 GPa] column has a circular section with a diameter of d = 560 mm.[L1 = 5.6 m, L2 = 5.6 m] Using this equation FL/AE

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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.