Page Comparison

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Notation

A_g = gross area of concrete section, in²
A_v = area of shear reinforcement within spacing s, in.²
D = dead load
E ₌ earthquake load
f_c^'₌ specified compressive strength of concrete, psi
f_yt = specified yield strength of transverse reinforcement, psi
L ₌ live load
L_{r =} roof live load
M_n = nominal flexural strength at section, in.-lb
M_{u =} factored moment at section, in.-lb
P_{n =} nominal axial compressive strength of member, lb
P_{u =} factored axial force; to be taken as positive for compression and negative for tension, lb
R ₌ rain load
S ₌ snow load
T_{n =} nominal torsional moment strength, in.-lb
T_{u =} factored torsional moment at section, in.-lb
U ₌ strength of a member or cross section required to resist factored loads or related internal moments and forces in such combinations as stipulated in ACI 318-19
V_n = nominal shear strength, lb
V_u = factored shear force at section, lb
W ₌ wind load
ϕ = strength reduction factor

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Required Strength

The required strength is calculated in accordance with the factored load combinations in Load Factors and Combinations per ACI 318-19 with ideCAD title.

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According to ACI 9.4.4.3, sections between the face of support and a critical section located d from the face of support can be designed for T_u at that critical section, except that there is a concentrated torsional moment within this distance.

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Design Strength

Design strength in all sections should satisfy all conditions given below;

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