Stavnitser Leonid R.
Stavnitser Leonid R.

Ставницер Леонид Рувимович Stavnitser Leonid R.
Dr.Sci. (Engineering), professor, сhief specialist of
the NIIOSP named after N.M. Gersevanov of JSC RCC. Moscow, Russian Federation 


Publications

Power and energy spectra as criteria for the intensity of technogenic, dynamic and seismic impacts
Issue: #6-2022
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Power and energy spectra are considered as additional criteria for the intensity of technogenic, dynamic and seismic impacts. Analyzing the consequences of a number of destructive earthquakes, it was revealed that the intensity of seismic impacts, in addition to ground acceleration, directly depends on the spectral characteristics of the energy and power of external influences. When calculating the design of dynamically tenacious systems, it is necessary to take into account the power and energy spectra in addition to the acceleration spectrum.

The use of the principle of seismic isolation in the structures of seismic protection of buildings on permafrost soils
Issue: #5-2022
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The active development of the Arctic zone, Siberia and the Far East in Russia in the last decade has prompted the authors to return to the problem of construction of structures in areas that may be affected by a number of natural phenomena during construction and operation. In the article, the authors narrow down the identified problems and analyze only options for the construction of earthquake-resistant buildings on permafrost soils, the situation most common in the territories of the so-called permafrost. The review and analysis of the existing and most frequently used construction options on permafrost soils according to the I and II principles are presented and the possibility of using special seismic protection systems at such facilities is assessed. The requirements for the characteristics of backfills in the case of construction according to principle I, variants of structural solutions of pile foundations during construction using principle II are given. The analysis of constructive solutions applied more than 40 years ago in the construction of residential blocks of buildings of the 122 series in Severobaikalsk, well-proven during the past earthquakes. The authors give examples of various variants of seismic protection devices when implementing the principle of seismic isolation, the implementation of which is carried out in the usual way by introducing various malleable support elements into the foundation part of the building. In the conclusions based on the results of the study, recommendations are given for the construction of earthquake-resistant buildings for the conditions of the Arctic zone.

Experience of dynamic monitoring of a base isolated building of a marine station located in Petropavlovsk-Kamchatsky city
Issue: #5-2022
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Introduction. The problem is considered and the relevance of studying the behavior of buildings and structures with seismic isolation systems using lead rubber bearing under real seismic impact, as well as assessing their technical condition after the earthquake, is emphasized. The experience of studying the behavior of base isolated buildings under real seismic impact abroad and in Russia is given.

Materials and methods. The dynamic parameters seismic isolation of a reinforced concrete building using lead rubber bearing are investigated. Registration of seismic vibrations of the building was performed by a stationary station for dynamic monitoring. The results of processing the records were obtained based on the interpretation of monitoring data, including harmonic analysis, determination of the power spectral density and signal transfer functions, as well as the application of wavelet transform methods.

Results. The data of dynamic monitoring of the seismically isolated building of the sea station located in the city of Petropavlovsk-Kamchatsky for the reporting year 2021 of monitoring are presented. The analysis of the reaction and dynamic parameters of the building during the most intense seismic events for the reporting period was performed.

Conclusions. The analysis of the results showed that the system of seismic isolation of the building during earthquakes of low intensity operates in the area of the initial rigidity of the seismic isolation supports, and the dynamic parameters of the seismically isolated building depend on the intensity of the seismic impact. It is concluded that the time-frequency analysis using wavelet transform methods has advantages in the analysis of dynamic monitoring data of buildings and structures with seismic isolation systems over the Fourier transform. The methods for analyzing dynamic monitoring data described in this article can be effectively used to assess dynamic parameters and then analyze their changes during the operation of base isolated buildings and structures. The study presented in this article shows that with the help of dynamic monitoring of buildings and structures, one can get a more complete and detailed understanding of their dynamic behavior, identify damage in the structural system of a building, and detect their undesirable or specific reactions that could not be taken into account when designing.

Earthquake Resistance of NPP Soil Base
Issue:
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The method of calculating local stability of the slab foundation base under a specified seismic impact has been developed. The method of predicting accumulation of irreversible foundation settlements during the service life of a structure is offered with consideration of the earthquake recurrence.