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Column Reinforcement Limits.

  • Longitudinal and Transverse reinforcement limits are controlled automatically.

İnternational Design Codes

ACI 318-19 : Column Reinforcement Limits per ACI 318-19 with ideCAD

TSC 2018 : Column Longitudinal Reinforcement Detailing Column Transverse Reinforcement Detailing and Limits

Ach = cross-sectional area of a member measured to the outside edges of transverse reinforcement, in.2
Ag = gross area of concrete section, in2
Ash = total cross-sectional area of transverse reinforcement, including crossties, within spacing s and perpendicular to dimension bc, in.2
Av = area of shear reinforcement within spacing s, in.2
Av,min = minimum area of shear reinforcement within spacing s, in.2
bc = cross-sectional dimension of member core measured to the outside edges of the transverse reinforcement composing area Ash, in.
bw = width of compression face of member, in.
db = nominal diameter of bar, wire, or prestressing strand, in.
fc' = specified compressive strength of concrete, psi
fy = specified yield strength for nonprestressed reinforcement, psi
fyt = specified yield strength of transverse reinforcement, psi
hx = 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.
kf = concrete strength factor
kn = confinement effectiveness factor
lo = length, measured from joint face along axis of member, over which special transverse reinforcement must be provided, in.
lu = unsupported length of column or wall, in.
lw = length of entire wall, or length of wall segment or wall pier considered in direction of shear force, in.
nl = number of longitudinal bars around the perimeter of a column core with rectilinear hoops that are laterally supported by the corner of hoops or by seismic hooks.
Pu = 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.
so = center-to-center spacing of transverse reinforcement within the length lo, in.
Vc = nominal shear strength provided by concrete, lb
Vn = nominal shear strength, lb
Vu = factored shear force at section, lb
ϕ = strength reduction factor
ρs = ratio of volume of spiral reinforcement to total volume of core confined by the spiral, measured out-to-out of spirals

Minimum and maximum longitudinal reinforcement

Minimum shear reinforcement

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