BES 5

A structural steel column with F_y = 250 MPa
having an unbraced length of 3m is to carry a total axial load of 1800 kN. Which of the following sections is most economical (lightest ) for the given loads. The comumn is hinged at both ends.
Section A: Area = 13,800mm² I_x= 293.63 x10⁶mm⁴I_y= 67.59 x 10⁶mm⁴
SectionB: Area = 11,550 mm² I_x=177.04 x 10⁶mm⁴I_y=39.14x 10⁶mm⁴