The article deals with the topical problem of determining associated water masses in the context of structure oscillation modes by means of solving the temperature problem.
The problem is considering the non-uniform distribution of associated water masses on upstream face in order to adequately determine the dynamic performance of a deformed structure. The method is implemented for the oscillation mode making the greatest contribution into the seismic load.
The results of solving this problem for the arch concrete dam of Sayano-Shushenskaya HPP are presented as an example.
The frequencies obtained for the constructed three-dimensional model “dam-foundation” are found to numerically correlate well with the frequencies of the actual dam structure. Associated water mass curves are constructed, dam frequency eigenvalues are determined with and without allowance for water effect.