When we calculate the seismic response of dams, static loads such as self-weight and water pressure are often applied before applying seismic dynamic loads.
In static loading, the boundary of the foundation is constrained; in seismic dynamic loading, the acceleration or displacement is applied to the boundary while the static boundary is removed.
When changing from static to seismic dynamic loading, the removal of the static boundary has a big impact on the structural response. How to solve this problem?