Stress in Reinforcement

Stress in reinforcement

σ_{s} = f_{yd} + \frac{k \cdot f_{yd} - f_{yd}}{ε_{uk} - \frac{f_{yd}}{E_{s}}} \cdot [ε_{s} - \frac{f_{yd}}{E_{s}}]

σ_s	Stress in reinforcement
f_yd	Design value of yield strength = f_yk / γ_s
k	Characteristic limits ratio = f_tk / f_yk
ε_uk	Limit deformation
E_s	Modulus of elasticity
ε_s	Deformation in reinforcement = ε_ud = 0.9 ⋅ ε_uk
f_yk	Characteristic yield strength
γ_s	Partial safety factor of steel
f_tk	Characteristic value of tensile strength
ε_ud	Design value of limit deformation

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