Earthquake analysis of dams provide an added challenge beyond analysis of soil-structure systems because here there are two unbounded domains — the water and the foundation rock, interacting with each other as well as the dam — as opposed to only one unbounded domain in soil-structure interaction.
We show next how the theory of effective seismic input for soil-structure interaction is extended to the earthquake analysis of dams, and how the existing implementation in LS-DYNA is repurposed for such analysis.