(a) Durata dello sviluppo

Development Length

L_{dc} = (\frac{f_{y} \cdot ψ_{r}}{50 \cdot λ \cdot \sqrt{{f^{'}}_{c}}}) \cdot d_{b} = (\frac{(60000 psi) \cdot (1.0)}{50 \cdot (1.0) \cdot \sqrt{4000 psi}}) \cdot (0.75 in) = 14.23 in

f_y	Specified yield strength for nonprestressed reinforcement
ψ_r	Factor used to modify development length based on confining reinforcement
λ	Modification factor to reflect the reduced mechanical properties of lightweight concrete relative to normal weight concrete of the same compressive strength
f'_c	Compressive strength
d_b	Nominal diameter of bar, wire, or prestressing strand

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