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

the least lateral dimension of the member
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

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Concrete Technology and Design of Concrete Structures
The diameter of ties in a column should be

More than 5 mm but less than one-fourth of diameter of main bar
More than 5 mm and also more than one-fourth of diameter of main bar
More than or equal to 5 mm
More than or equal to one fourth of diameter of main bar

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