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Symmetries in cross-sections

For each generic section, a search for symmetries is made, since each symmetry represents an important simplification and checking in the calculation of properties, both inertia and shear/torsion.

Symmetries are recognized in order of importance:

  1. Bi-axial symmetry.
  2. Axial symmetry with respect to a principal axis of inertia.
  3. Central symmetry.

The symbols used to highlight symmetry are:

For example for steel sections the following symmetries (dxf file to import symm.dxf, with units in millimeters):

RHS 180 × 100 × 6.3, EN 10210-2:2006 stardard. Bi-axial symmetry.

T120, EN 10055:1995 stardard. Axial symmetry with respect to a principal axis of inertia.

L 70 × 70 × 7, EN10056-1:1999 stardard. Axial symmetry with respect to a principal axis of inertia.

Z 100 × 35 × 6. Central symmetry.