(Solved): The circular spiral-tied reinforced concrete column shown in the figure below supports a factored ...

The circular spiral-tied reinforced concrete column shown in the figure below supports a factored axial load \( P_{u} \) of 600 kips at an eccentricity of \( 6.0 \) in. Assume \( f_{c}^{\prime} \) for concrete is \( 4,000 \mathrm{psi} \), and \( f_{y} \) for steel is 60,000 psi. It may be assumed the resistance factor \( \phi=0.7 \). The required amount of longitudinal steel (placed in the circular pattern shown) expressed as a percentage of the gross area of the column is most nearly: (A) \( 1 \% \) (B) \( 2 \% \) (C) \( 5 \% \)