Each design strip (span segment strip) segment cross section and design section and determines its own design centroid location. The location is determined as follows:

1. A final cross section is determined by considering (i) the trimmed cross section for design strip segments, and (ii) the top and bottom "ignore" depths for design sections.
2. The centroid z-elevation of this final cross section is the design centroid z coordinate.
3. A cross section “core” is determined (see "Concrete "Core" Determination"). For a T shaped section the core will be the stem from the bottom of the section to the top of the section. For a rectangular section, the core will be the entire section.
4. The core’s x and y centroid coordinates are the design centroid’s x and y coordinates.
5. You can view the centroid of a design strip segment cross section in the first page of an audit. See Chapter 31, "Using the Auditor" for more information.