Transverse Reinforcement.

Minimum diameter of tie bar is controlled automatically according to Codes.

Minimum and maximum clear spacing of ties are controlled according to Codes.

Minimum spacing of spirals are controlled according to Codes.

İnternational Design Codes

ACI 318-19 : https://idecad.atlassian.net/wiki/spaces/T2EB/pages/1804406101

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

Symbols

d_agg = Nominal maximum size of coarse aggregate, in.
d_b = nominal diameter of bar, wire, or prestressing strand, in
A_ch = cross-sectional area of a member measured to the outside edges of transverse reinforcement, in.²
f'_c = specified comprehensive strength of concrete, psi
f_yt = specified yield strength of transverse reinforcement, psi
A_g = gross area of concrete section, in.² For a hollow section, Ag is the area of the concrete only and does not include the area of the void(s)
ρ_s = ratio of volume of spiral reinforcement to total of core confined by the sprial, measured out-to-out of spirals