The diameter of ties in a column should be

- 1
  
  more than or equal to 1/4th of diameter of main bar
- 2
  
  More than or equal to 5 mm
- 3
  
  More than 5 mm but less than 1/4th of diameter of main bar
- 4
  
  more than 5 mm and also more than 1/4th of diameter of main bar

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