> For the complete documentation index, see [llms.txt](https://docs.openbrim.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.openbrim.org/templates/spliced-i-girder-bridge-workflow/construction-spig/changes-spig/pier-section-property-override-spig.md).

# Pier Section Property Override \[SPIG]

This workflow item overrides the section properties (area, shear area, torsion constant, and inertia) of a pier column starting at a specified construction stage — typically used to apply cracked-section properties for seismic analysis.

## Section Overrides

**Pier Column:** Pier column whose section properties are being overridden.

**Stage:** Construction stage at which the overridden properties take effect for both FEM and design.

**Section Area Factor:** Multiplier applied to the section's axial area.

**Section Shear Area Y Factor:** Multiplier applied to the section's shear area in the Y direction.

**Section Shear Area Z Factor:** Multiplier applied to the section's shear area in the Z direction.

**Section Torsion Constant Factor:** Multiplier applied to the section's torsion constant (J).

**Section Inertia Y Factor:** Multiplier applied to the section's moment of inertia about Y.

**Section Inertia Z Factor:** Multiplier applied to the section's moment of inertia about Z.


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