Design a round spiral column to support an axial dead load of 500 KN and an axial live load of 650 KN. Assume that 3% longitudinal steel is desired, f'c = 35 MPa and fy = 420 MPa. Use 16 mm diameter main reinforcement. determine the spacing of 10 mm spiral (fy = 275 MPa) with 30 mm steel covering.

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