Strength reduction factors ϕ are defined by default according to ACI Table 21.2.1 and Table 21.2.2.
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Strength The strength Reduction Factor for a combined moment and axial force is calculated automatically according to ACI Table 21.2.2. The column capacity interaction volume is calculated by a A series of discrete points that are generated on the three-dimensional interaction failure surface calculates the column capacity interaction volume.
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Shear The shear strength reduction factor for Earthquake-Resistant Structures is determined automatically.