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Pillar Shape

In CPillar , the pillar geometry can be modeled as either a:

  • Rectangular Pillar
  • Polygonal Pillar

The Pillar Shape can be selected in the Project Settings dialog.

NOTE: Polygonal Pillar shape is selected by default. When modeling a Polygonal Pillar, only Rigid Analysis Method can be selected. Elastic and Voussoir Analysis Methods are formulated specifically for a Rectangular Pillar. See the Analysis Method topic for more information.

Rectangular Pillar

CPillar computes the factor of safety for a Rectangular crown pillar formed by:

  • Some length (x) and width (y),
  • Some uniform height (z), and
  • Vertical abutments (for a rectangular pillar).

A typical rectangular problem geometry is illustrated below:

Typical rectangular pillar geometry for CPillar analysis.

Typical Rectangular Pillar Geometry Model View
Typical rectangular pillar geometry for CPillar analysis.

Polygonal Pillar

CPillar computes the factor of safety for a Polygonal crown pillar formed by:

  • At least three unique vertices (x, y) that define a 2D polygon,
  • Some uniform height (z), and
  • Vertical abutments, or slanted abutments defined by Trend and Plunge.

A typical polygonal problem geometry is illustrated below:

Typical Polygonal Pillar Geometry Model View
Typical polygonal pillar geometry for CPillar analysis.
NOTE: Only Rigid Analysis is allowed when using Polygonal Pillar shape. The Analysis Method will automatically be set to Rigid if Pillar Shape = Polygonal Pillar. If Pillar Shape changes affect abutment material assignment, then the material assignment will be reset to defaults (i.e., all abutments will be assigned the first Material Property)

See the Geometry topic for more information.

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