The casing is not included in the calculation of the section properties. The casing is use primarily for confinement, and optionally will contribute to the moment-curvature relationship depending on the value of the Longitudinal Factor, which varies from zero (no contribution) to unity (full contribution).
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Related Incidents: - Incident 52096: Constribution of casing is not being included in the calculation of section properties for a section designer section.
- Incident 98265: Caltrans shape with steel casing
- Email "Explanation that casing is not included in the section properties, only as confinement and for moment curvature": (bm → support, 12/1/2016, ID 18153562)
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