ACI Chapter 22 applies to calculating nominal strength at sections of members, including (a) through (g):

(a) Flexural strength
(b) Axial strength or combined flexural and axial strength
(c) One-way shear strength
(d) Two-way shear strength
(e) Torsional strength
(f) Bearing
(g) Shear friction

Design strength at a section is calculated as the nominal strength multiplied by the valid strength reduction factor ϕ given in Strength Reduction Factors section.

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Flexural Strength