If σs is the shear stress in bar and Ԏbd is the design band stress, then the development length of a bar of diameter  Φ is given by

If σ_s is the shear stress in bar and Ԏ_bd is the design band stress, then the development length of a bar of diameter  Φ is given by

1. 4 Φ σ_s
2.  Φ σ_s/4 𝜏_bd     (Ans)
3. 2Φ σ_s/3 𝜏_bd
4. Φ σ_s/3 𝜏_bd