If d is the thickness of a concrete pavement, the equivalent radius b of resisting section for an interior loading, is

- 1
  
  $b = \sqrt{0.6 + d^{2}} - 0.675 d$
- 2
  
  $b = \sqrt{1.6 + d^{2}} + 0.675 d$
- 3
  
  $b = \sqrt{1.6 + d^{2}} - 3.675 d$
- 4
  
  $b = \sqrt{1.6 + d^{2}} - 0.675 d$

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