2. For I-sections, singly symmetric C-sections, or Z-sections bent about the centroidal axis perpendicular to the web (x-axis), the following equations are permitted to be used in lieu of (1) to

for doubly symmetric I-sections and singly symmetric C-sections and

for point-symmetric Z-sections. In Equations 6.54 and 6.55 d is the depth of the section and Iyc is the moment of inertia of compression portion of section about centroidal axis of the entire section parallel to web, using full unreduced section.

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