• Beam design shear strengths are calculated automatically.

  • Beam required shear strengths are calculated automatically.


International Design Codes

ACI 318-19 : Beam Shear Design

TSC 2018 : Beam Shear Design Force


Notation in ACI 318-19

Av = area of shear reinforcement within spacing s, in.2
Av,min = minimum area of shear reinforcement within spacing s, in.2
bw = width of compression face of member, in.
c1 = dimension of rectangular or equivalent rectangular column, capital, or bracket measured in the direction of the span for which moments are being determined, in.
d = distance from extreme compression fiber to centroid of longitudinal tension reinforcement, in.
D = dead load
E = earthquake load
fc' = specified compressive strength of concrete, psi
fy = specified yield strength for nonprestressed reinforcement, psi
fyt = specified yield strength of transverse reinforcement, psi
ln = length of clear span measured face-to-face of supports, in.
lu = unsupported length of column or wall, in.
L = live load
Lr = roof live load
Mn = nominal flexural strength at section, in.-lb
Mpr = probable flexural strength of members, with or without axial load, determined using the properties of the member at joint faces assuming a tensile stress in the longitudinal bars of at leasts 1.25fy and a strength reduction factor ϕ of 1.0, in.-lb
Pn = nominal axial compressive strength of member, lb
Pu = factored axial force; to be taken as positive for compression and negative for tension, lb
R = rain load
S = snow load
s = center-to-center spacing of items, such as longitudinal reinforcement, transverse reinforcement, tendons, or anchors, in.
Tn = nominal torsional moment strength, in.-lb
Tu = factored torsional moment at section, in.-lb
Vc = nominal shear strength provided by concrete, lb
Ve = design shear force for load combinations including earthquake effects, lb
Veb = Capacity shear force of the column based on the maximum probable moment strengths of the beams framing into the column, lb
Vec = Capacity shear force of the column based on the maximum probable flexural strengths of the two ends of the column, lb
Vn = nominal shear strength, lb
Vs = nominal shear strength provided by shear reinforcement, lb
Vu = factored shear force at section, lb
wu = factored load per unit length of beam or one-way slab, lb/in.
W = wind load
ϕ = strength reduction factor
o = overstrength factor for the lateral-force-resisting system


Beam required strength is calculated in accordance with the factored load combinations.