Variations in the integral amplification of of seismic ground motions on the territory of Kiev

Abstract

The relevance of the research and the results presented in the article is due to the need to provide the designers of seismic-resistant construction with maps of seismic zoning of settlements and agglomerations on the territory of Ukraine in the amplitude parameters of seismic ground motions. An analytical-empirical approach to mapping is proposed on the example of the territory of Kyiv, which can be implemented in conditions of an insufficient number of results of instrumental seismological observations. This approach gives positive results provided that the territory is well studied in geological terms. Within the territory of Kyiv, using the method of seismic-geological analogies, areas (taxonometric zones) have been identified that are homogeneous in response to seismic effects. For all taxonometric zones, seismic-geological models of the soil strata were built and their spectral characteristics were calculated taking into account the nonlinear deformation of the soil. The averaged frequency response was also calculated for the ground conditions of the territory of Kyiv as a function of the distribution of the average values of the spectral amplification of seismic oscillations in frequency for all zones. A map of the distribution of the deviation of the integral amplification of seismic vibrations from the average value for the territory of Kyiv was constructed. It is proposed to use a spectral amplification map to determine the values of the calculated relative ground acceleration of the investigated site when using the spectral method for calculating the emergency combination of loads taking into account the seismic effect. The map of the distribution of the deviation of the integral amplification of seismic oscillations from the average value for the territory of Kyiv is an intermediate stage in the construction of seismic zoning maps for Kyiv in amplitude terms of ground motions.