According to IS : 456-1978, if fy is the characteristic strength of steel and Es is the modulus of elasticity of steel, then the maximum strain in the tension reinforcement in the section at failure should not be less than

- 1
  
  0.002 + (fy / 1.5 Es)
- 2
  
  0.0035 + ( fy / 1.15 Es)
- 3
  
  0.002 + (fy / 1.15 Es)
- 4
  
  0.0035 + (fy / 1.5 Yes)

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