Activation Factor Contribution of Reinforcement Layer

Multiplicative contribution of the reinforcement layer j to the direction-dependent activation factor of the local anisotropic tension stiffening extension. The capacity and position factors use the equivalent strains.

{Δ α}_{j, k} = g_{j} (ε_{eq, s, j}) \cdot a_{j, k} (Δ θ) \cdot p_{j} (ε_{eq, c}, ε_{eq, s, j}, d_{j})

Δα_j,k	Contribution of the reinforcement layer j to the activation factor of the principal direction k
g_j	Capacity factor of the reinforcement layer j
a_j,k	Angle factor between the reinforcement layer j and the principal direction k
p_j	Position factor of the reinforcement layer j
ε_s,j	Strain of the reinforcement layer j
ε_c	Concrete strain
z	Location along the cross-section thickness (depth coordinate)
Δθ	Angle between the reinforcement direction and the principal tensile direction
ε_eq,s,j	Equivalent strain at the location of the reinforcement layer j
ε_eq,c	Equivalent strain in the analyzed concrete layer

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