(b) Lunghezza di sviluppo

Development Length

L_{dc} = 0.0003 \cdot f_{y} \cdot ψ_{r} \cdot d_{b} = 0.0003 \cdot (60000 psi) \cdot (1.0) \cdot (0.75 in) = 13.5 in

f_y	Specified yield strength for nonprestressed reinforcement
ψ_r	Factor used to modify development length based on confining reinforcement
d_b	Nominal diameter of bar, wire, or prestressing strand