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American Concrete Design
Section 3
3-12
3.6.5 Cracked Moment of Inertia – ACI Beam Design
When beam design is done per ACI 318, STAAD will report the
moment of inertia of the cracked section at the location where the
design is performed. The cracked section properties are calculated
in accordance with the equations shown below.
Rectangular sections
Figure 3.4
Tee shaped sections
Figure 3.5