Concrete Technology and Design of Concrete Structures
Minimum pitch of transverse reinforcement in a column is

forty-eight times the diameter of transverse reinforcement
sixteen times the smallest diameter of longitudinal reinforcement bar to be tied
lesser of the above three values
the least lateral dimension of the member

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Concrete Technology and Design of Concrete Structures
Due to circumferential action of the spiral in a spirally reinforced column

Capacity of column is decreased
Both the capacity of column and ductility of column increase
Capacity of column is decreased but ductility of column increases
Ductility of column reduces

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