Bottom bars under the columns ae extended into the interior of the footing slab to a distance greater than

- 1
  
  42 diameteres from the centre of the column
- 2
  
  42 diameters from the inner edge of the column
- 3
  
  42 diameters from the outer edge of the column
- 4
  
  24 diameter from the centre of the column

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