The figure above shows a model representing a building (red) upon soil — the blue part is the elastic soil domain and the green part is the PML. The figure on the right shows the soil-structure interface.
An example of a purely dynamic analysis of this system — without any gravity load — is given in the input deck ssi-dynamic.k. Transient analysis of the system following an initial static analysis is demonstrated by a pair of input decks: ssi-static.k and ssi-transient.k, to be run one after the other. The ground motions used in the analysis are given in elcentro-x.ath, elcentro-y.ath, and elcentro-z.ath.
NOTE: Please ignore any error messages from LS-Prepost that flag the INTERFACE_SSI cards as invalid.