For solid round steel column, where the load is distributed over the whole area, the minimum thickness of square base (r), as per IS : 800-1984, is given by

[Where, W= Total axial load, B= Length of the side base, d=Diameter of reduced end of the column, and $σ_{b}$ = Allowable bending stress in steel]

- 1
  
  $t = \frac{1}{4} \sqrt{\frac{W}{σ_{b}} (\frac{B}{B - d})}$
- 2
  
  $t = \frac{1}{2} \sqrt{\frac{W}{σ_{b}} (\frac{B}{B - d})}$
- 3
  
  $t = \frac{3}{4} \sqrt{\frac{W}{σ_{b}} (\frac{B}{B - d})}$
- 4
  
  $t = \sqrt{\frac{W}{σ_{b}} (\frac{B}{B - d})}$

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