Ilnur R. Giziatullin
head of the Structures calculation sector of LSSIMS, TSNIISK named after V.A. Kucherenko of JSC RCC. Moscow, Russian Federation
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.
Structural building systems using cross-laminated timber (CLT) are steadily gaining popularity due to their huge advantages over traditional technical solutions. The lightness of the material, the pliability of the mechanical joints of the panels provides a potential high seismic resistance of buildings made of CLT, despite irreversible damage to the wood panels in the joints. As a result of the inherent competitiveness of cross-laminated wood, their use is gradually increasing worldwide. The article presents a brief review and analysis of existing domestic and foreign regulatory and technical documents and the results of studies performed in the field of calculation and design of buildings based on CLT panels erected in earthquake-prone areas. The results of experimental studies aimed at studying the features of the operation of CLT panels with different numbers and arrangement of lamella layers under the influence of static and dynamic loads simulating seismic effects are presented. The results of recent achievements in the field of experimental studies of CLT building structures under seismic loads are reviewed and summarized to demonstrate current progress, problems and future directions of research.