Properties [FEA]

The Properties branch holds the material and section definitions that turn geometry into stiffness.

Materials supply modulus, Poisson's ratio, density and thermal expansion - the properties that drive the analysis - plus the strength values and time-dependent behaviour used by design and staged construction. Sections supply the cross-sectional properties: area, moments of inertia, torsion constant and shear areas.

Rebars and Strands are property library entries describing bar and strand sizes. They are used by design and section analysis; they do not create elements of their own.

These objects are referenced by name from elements, so one definition serves many members - and a change to a material or section propagates to every element that uses it.