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.
Minimum diameter of spiral is controlled automatically according to Codes.
The volumetric spiral reinforcement ratio ρs is controlled according to Codes.
İnternational Design Codes
ACI 318-19 : Transverse Reinforcement
dagg = Nominal maximum size of coarse aggregate, in.
db = nominal diameter of bar, wire, or prestressing strand, in
Ach = cross-sectional area of a member measured to the outside edges of transverse reinforcement, in.2
f'c = specified comprehensive strength of concrete, psi
fyt = specified yield strength of transverse reinforcement, psi
Ag = 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)
ρs = ratio of volume of spiral reinforcement to total of core confined by the sprial, measured out-to-out of spirals