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In the article, the results of approbation of the developed technique of the refined numerical simula-tion of the dynamic stress-strain state of the three-dimensional system “ground base (earth foundation) – reser-voir – construction of the pressure head of the hydraulic system” under seismic influences. A comparison is made between two different ways of modeling the fluid interacting with the structure and the base of the hydroe-lectric power station. The issues of choosing the dimensions of the base unit and taking into account the inertial load from it, as well as the method of determining the initial seismic action, are touched upon.

At present, as is known, there are many methods of reduction of computational dimension of problems of structural analysis within finite element method (FEM), including the reduction of the dimensions of the mass matrix and the stiffness matrix of the finite element model (to bring them, for example, in accordance with the “structural health monitoring” (or “test”) model of the object, which degrees of freedom are determined by the places of installation of accelerometers. In this respect, the following approaches are considered in this paper (with the corresponding analysis of the advantages and disadvantages): the Gaian reduction method, the IRS (Improved Reduced System) reduction method and the dynamic reduction method. In addition, the so-called static finite element method for seismic analysis of underground structures, based on the substructuring technique, is considered.