1. But

Produce a load that can be used in dynamic resolution operators DYNA_VIBRA and DYNA_NON_LINE in order to be able to take into account seismic loads at the borders of 2D or 3D ground domains. The charges created potentially come from two sources: either « plane wave » charges deduced from movements imposed at the lateral borders in the direction of propagation, or second member complements of the « nodal force » type imposed on the lateral borders in the directions transverse to the propagation.

The data on imposed movement or force fields can also come from two sources: either a file resulting from transitory evolutions resulting from an auxiliary calculation of a 2D ground column by DEFI_SOL_EQUI, or a results-type evolution calculated on an auxiliary model and projected onto the boundaries of the domain.

It takes into account the concomitant nature of these alternative choices:

• source of transitory data on movements or forces at borders: either a unit of transitional results obtained by DEFI_SOL_EQUI for the auxiliary calculation of the 2D ground column behind the keyword UNITE_TRAN_UNIT and in this case data consistent with DEFI_SOL_EQUI are entered; or a result of transitory evolutions at the borders of the basin calculated on a 2D or 3D auxiliary model entered behind the keyword RESU_INIT and consistent with the new syntax of CREA_RESU. In both cases, it is necessary to specify the type of load plane wave or force imposed by the keyword CHARGEMENT.