Reinforcement Detailing of Joints.

International Design Codes

ACI 318-19 : Reinforcement Detailing of Joints per ACI 318-19 with ideCAD

TSC 2018 : Transverse Reinforcement Detailing for Beams. Column Transverse Reinforcement Detailing and Limits

Notation in ACI 318-19

d_b = nominal diameter of bar, wire, or prestressing strand, in
f_c^' = specified compressive strength of concrete, psi
√fc‘ = square root of specified compressive strength of concrete, psi
f_y = specified yield strength of nonprestressed reinforcement, psi
l_d = development length in tension of deformed bar, deformed wire, plain and deformed welded wire reinforcement, or pretensioned strand, in.
l_dc = development length in compression of deformed bars and deformed wire, in.
l_dh = development length in tension of deformed bar or deformed wire with a standard hook, measured from outside end of hook, point of tangency, toward critical section, in.
l_dm = the required development length if bar is not entirely embedded in confined concrete, in.
s = center-to-center spacing of items, such as longitudinal reinforcement, transverse reinforcement, tendons, or anchors, in.
λ = modification factor to reflect the reduced mechanical properties of lightweight concrete relative to normalweight concrete of the same compressive strength