Design a built up column 10 m long to carry an axial load of 750000 N…

Question

Design a built up column 10 m long to carry an axial load of 750000 N. The column is restrained in position but not in direction at both the ends. Provide single lacing system with riveted connections. Assume fy = 250 MPa.

i) Design the column with two channel placed back to back

ii) Design the column with two channels placed toe to toe

iii) Design the lacing system with welded connections for channels back to back.