Transverse Reinforcement Detailing

International Design Codes

ACI 318-19 : Transverse Reinforcement (CRD) per ACI 318-19 with ideCAD

TSC 2018 : Transverse Reinforcement Detailing for Columns

Notation in ACI 318-19

A_g = gross area of concrete section, in.² For a hollow section, A_g is the area of the concrete only and does not include the area of the void(s)
A_b = area of an individual bar or wire, in.²
b_w = width of compression face of member, in.
d = distance from extreme compression fiber to centroid of longitudinal tension reinforcement, in.
d_agg = Nominal maximum size of coarse aggregate, in.
d_b = nominal diameter of bar, wire, or prestressing strand, in
f_c^' = specified compressive strength of concrete, psi
f_y = specified yield strength of nonprestressed reinforcement, psi
h = overall thickness, height, or depth of member, in.
h_x = maximum center-to-center spacing of longitudinal bars laterally supported by corners of crossties or hoop legs around the perimeter of a column or wall boundary element, in.
l_d = development length in tension of deformed bar, deformed wire, plain and deformed welded wire reinforcement, or pretensioned strand, in.
l_o = length, measured from joint face along axis of member, over which special transverse reinforcement must be provided, in.
l_u = unsupported length of column or wall, in.
P_u = factored axial force; to be taken as positive for compression and negative for tension, lb
s = center-to-center spacing of items, such as longitudinal reinforcement, transverse reinforcement, tendons, or anchors, in.

s_o = center-to-center spacing of transverse reinforcement within the length l_o, in.

The spacing of transverse reinforcement is is determined automatically to meet the most restrictive requirements. uding earthquake effects is less than A_gf_c′/10.