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Design a round spiral column to support an axial dead load of 900kN and an axial live load of 1300 kN. Assume that 3% longitudinal steel is desired, fc ′ =27.6MPa, and fy=414MPa. Use 25 mm main reinforcement. Determine also the minimum spacing of 10 mm spiral (f yh =275MPa) with 30 mm steel covering.
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