NUMERICAL SOLUTION OF THREE-DIMENSIONAL PROBLEMS OF SEISMIC STABILITY OF LARGE STRUCTURES
The paper presents an efficient numerical technique for seismic stability 3D-modeling of large buried structures. This technique allows to consider the subsoil-structure contact interaction, gravity field effects, the inhomogeneous structure of soil and the variative location of the earthquake hypocenter. As part of this technique is substantiated sizing of the soil-structure computational domain and continuum model for hard and soft soil foundations describing. The numerical technique for determining the kinematic conditions at the lower boundary of the computational domain from the experimental accelerograms at the soil surface is given, offered special non-reflecting waves boundary conditions. The described above methods and algorithms for seismic resistance solving have been implemented in certified software package «Dynamics-3», parallelization of the algorithm have been held according to the spatial domain decomposition principle. The developed numerical technique allows to correctly pose the problem of seismic vibrations of buried structure, reduce computing costs and increase the efficiency of numerical studies of Earthquake Engineering. Through this the multiple conversion tasks with different action scenarios generated by probabilistic methods of experimental seismograms became technically possible. The results of these calculations allow reflecting the experience of many earthquakes, which increases reliability of the estimates. The paper presents the model calculations results of seismic stability of buried NPP structure - mutual vertical and horizontal displacement of soil and building walls - which can then be used to assess strength of adjacent underground pipelines.