1. Generalities

The sd_gfibre data structure (produced by the defi_geom_fibre command) contains the definition of one or more fiber groups used by the « multi-fiber » elements. This data structure consists of \(\mathit{nbgf}\) fiber groups.

• Each fiber group is defined by an occurrence of one of the 3 keywords factor section, fiber. and ASSEMBLAGE_FIBRE.

• Each fiber group has a name given by the user.

• Each fiber group contains a certain number of \(\mathit{nbfib}\) fibers.