Introduction. The analysis of foreign studies of seismic resistance of frame-sheathing partitions with a frame made of cold-formed galvanized steel sections with a frame made of cold-formed galvanized steel sections and sheathing panels made of gypsum-based sheet materials is performed. The relevance of the study is shown and the problems of standardization limiting the widespread use of frame-sheathing partitions in seismically hazardous areas are identified. This article is the first in a series of articles devoted to the study of seismic resistance of frame-sheathing partitions with a frame made of cold-formed galvanized steel profiles and sheathing panels.

Materials and methods. The designs of the samples were adopted based on the stated goal and objectives of the experimental studies and the results of the review and analysis of modern scientific, technical, regulatory, and methodological literature. The experimental samples reproducing the most common design solutions for frame-sheathing partitions used in construction practice were taken as a basis. Experimental studies included testing of frame-sheathing partitions with a frame made of cold-formed galvanized steel sections, sheathed with plasterboard panels, under the action of quasi-static alternating cyclic loads simulating seismic effects.

Results. Within the framework of this work, experimental studies of the seismic resistance of frame-sheathing partitions with a frame made of cold-formed galvanized steel sections and sheathing panels made of gypsum-based sheet materials were carried out.

Based on the results of experimental studies, destructive loads were determined, damage and failure patterns of samples were established, limiting values ​​of distortions were determined, and the nature of sample failure under alternating quasi-static loads simulating the stress-strain state of the partition arising from seismic effects was established.

Conclusions. The test results confirm the seismic resistance of the tested structures of frame-sheathing partitions. The obtained data can be used for the development and updating of regulatory and technical documents, as well as for the design and construction of frame-sheathed partitions with a steel cold-formed galvanized profile frame and sheathing panels made of gypsum-based sheet materials in seismic regions.

Introduction. The article considers the behavioral features, identifies the advantages and disadvantages of steel-timber composite floor structures based on multilayer cross-laminated timber panels. The relevance of the study is shown and the problems limiting the widespread use of steel-timber composite floor structures in seismically hazardous areas are identified.

Materials and methods. A systematic review and analysis of domestic and foreign studies of the seismic resistance of steel-timber composite floor structures based on multilayer cross-laminated timber panels was performed. The article uses systematization, structural, comparative and contrastive analyses, theoretical generalization of materials obtained from the analysis of domestic and foreign regulatory and technical documents, as well as literary sources containing information on the results of studies of the seismic resistance of steel-timber composite floor structures based on multilayer cross-laminated timber panels.

Results. The article reviews and summarizes the results of experimental studies of seismic resistance of steel-timber composite floor structures based on multilayer cross-laminated timber panels. Current achievements, current problems and promising areas for further research are demonstrated. The analysis results confirm that steel-timber composite floor structures based on multilayer cross-laminated timber panels provide a competitive and effective solution for the construction of buildings in seismically hazardous areas. The study results confirm that the effective interaction of steel beams and multilayer cross-laminated timber panels provides an optimal balance between rigidity and ductility of the combined steel-reinforced concrete metal-wood floor structure, which is especially important for resisting seismic loads and ensuring the reliability and mechanical safety of the building. However, the lack of regulatory documents governing the design of steel-timber composite floor structures based on multilayer cross-laminated timber panels for buildings erected in seismic zones limits their widespread implementation in construction practice.

Conclusions. The need for theoretical and experimental research, development and improvement of regulatory and technical documents is confirmed, which will expand the use of steel-timber composite floor structures based on multilayer cross-laminated timber panels, ensuring the reliability and mechanical safety of buildings erected using them, including in seismic zones.

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.

In compliance with amount of works on monitoring of dynamic behavior of buildings and constructions in seismodangerous areas the CREE TSNIISK named after V.A. Kucherenko carried out of installation work of station of dynamic monitoring in Kamchatka region. During operation of stations there was one earthquake measuring 7,7 and epicenter in the 200th kilometers from the settlement of Nikolskoye.

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, as well as the application of wavelet transform methods.

Results. The results of dynamic monitoring of a base isolated building of a sea terminal located in Petropavlovsk-Kamchatsky city during an earthquake of 04/03/2023 with a magnitude of Mw =6.6 and an intensity at the site of the building equal to 7 points on the MSK-64 scale are presented. An analysis of the response and dynamic parameters of the building was performed, as well as a visual inspection of structures, as well as the building's seismic isolation systems.

Conclusions. Analysis of the dynamic monitoring results made it possible to identify the natural vibration frequencies of the building, as well as to trace their changes during seismic impact. The maximum displacements of the building indicate minor shear deformations of the lead rubber bearing corresponding to the zone of their elastic operation. Both the rigidity of lead rubber bearing and the dynamic parameters of the building (frequencies (periods) of natural vibrations and the logarithmic damping decrement of the building) change depending on the intensity of the seismic impact and the shear deformation of the bearings, respectively. After the earthquake, widespread cracks and peeling of the plaster wall were observed with partial exposure of the layer of insulating material in the zone of filling with elastic elements the gaps between the strapping beams of the seismic isolation system and the structures of the building partitions at the level of the seismic isolating layer, which did not affect the operational reliability of the building. 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.