(Solved): The bending moment diagram for a steel column is shown in Figure 4 with M*-120 kN.m acting at the t ...

The bending moment diagram for a steel column is shown in Figure 4 with M*-120 kN.m acting at the top of the column. The moment is due to eccentricity (e.) and is about the major axis (x axis) of the column. The column also carries an ultimate compressive load N* kN. The column is fixed at the base. The top of the column is pinned and is laterally restrained by braces. There is also a restraint at the middle of the column, so that the effective length for out-of-plane buckling is Ley = 0.5L where, L=6 m. The effective length for the x-axis column buckling is Lex - 0.85L. Assume kk-k, 1. The column is 250UC89.5 in grade 300PLUS. Determine the ultimate compressive load N* the column can safely carry considering cases a) and b) below: (a) The in-plane member moment capacity of the column under combined actions. (b) The out-of-plane member moment capacity of the column under combined actions. (60 marks) (70 marks) (c) In this scenario, if the applied load N* is higher than what the column can carry, explain with reasoning what you would suggest to increase the load carrying capacity of the column without revising the section. Limit your answer to one paragraph. (20 marks) The section properties of 250UC89.5 are given below (from OneSteel Tables): d=252 mm, t, -8.6mm, 1-6.1mm, 4,-4010mm ¹ I, 44.5×10 mm P -105 mm, 2, -395-10 mm 1,-447x10 mm.r, -33.4 mm, Z-91.4×10 mm" 1,-65.9x10 mm.J-893-10' mm f-320 MPa, k, 1.0 (form factor), E-200000 MPa, G-80000 MPa N* KN M kNm 0.25M kNm1 0.5M kNm 0.5L Fixed