Based on punching shear consideration, the overall depth of a combined footing sunder a column A, is

- 1
  
  $\frac{A r e a o f t h e c o l u m n A x S a f e p u n c h i n g s t r e s s}{L o a d o n c o l u m n A}$
- 2
  
  $\frac{P e r i m e t e r o f c o l u m n A x S a f e p u n c h i n g s t r e s s}{L o a d o n c o l u m n A + U p w a r d p r e s s u r e x A r e a o f c o l u m n}$
- 3
  
  $\frac{P e r i m e t e r o f c o l u m n A x S a f e p u n c h i n g s t r e s s}{L o a d o n c o l u m n A + U p w a r d p r e s s u r e x A r e a o f c o l u m n}$
- 4
  
  None of these

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