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Dimensions of the cross-section should be satisfy ACI Eq. (22.5.1.2). It’s automatically controlled and users are warned if the rule is not satisfied. |
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International Design Codes
ACI 318-19 : One-Way Slab Design Strength
TSC 2018 :
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Symbols in ACI 318-19
Mu = factored flexural moment at section, lb
Mn = nominal flexural strength at section, in.-lb
f'c = specified comprehensive strength of concrete, psi
Ac-sh = area of concrete used to determine shear stress, in2
Ag = gross area of concrete section, in2
bw = web width or diameter of circular section, in.
d = distance from extreme compression fiber to centroid of longitudinal tension reinforcement, in.
h = overall thickness, height, or depth of member, in.
s = center-to-center spacing transverse reinforcement, in
Vc = nominal shear strength provided by concrete, lb
Vn = nominal shear strength, lb
Vs = nominal shear strength provided by shear reinforcement, lb
Vu = factored shear force at section, lbTo design one-way slab under flexural moment, one-way slab design strength is provided ΦSn ≥ U. Both flexural moment and shear strength is controlled according to 7.5.1.1.
ΦMn ≥ Mu
ΦVn ≥ Vu
7.5.2 Moment
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Moment
Nominal flexural strength is calculated as shown below. Detailed information: Flexural Strength
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The shear strength is based on an average shear stress over the effective cross section, bwd. Therefore dimensions of the cross-section should be satisfy ACI Eq. (22.5.1.2). Detailed information: One-Way Shear Strength
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Vn is determined according to 22.5. Nominal one-way shear strength at a section, Vn, is calculated by eq. 22.5.1.1.
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