Introduction. The series of recent earthquakes that have taken place on the territory of Russia has once again clearly shown that this natural disaster is characterized not only by its unpredictability, nature, and direction, but even by a significant duration, as was the case, for example, in Kamchatka in 2025. It is possible to resist the elements only with the use of reliable and proven earthquake-resistant construction constructive solutions, to these include multicommunicated systems made of precast reinforced concrete structures, among which bulk-block structures form a special group. The effectiveness of their operation significantly depends on the presence of additional damping elements in the system. The article presents an analysis of some of these solutions, which is necessary to understand how structures work during earthquakes.

Aim. To show the features of structural solutions of three-dimensional block buildings in the presence of damping elements in them in the form of friction bonds that ensure continuous energy dissipation during the entire exposure period.

Materials and methods. The analysis of existing structural solutions of three-dimensional block buildings with the inclusion of damping elements in the form of friction bonds is carried out.

Conclusions. Additional computational and experimental studies are needed to substantiate the possibilities of the considered solutions for three-dimensional block buildings with friction elements.

Seismic isolation technologies are becoming increasingly widespread in earthquake engineering. The technology, known since ancient times, has been developed in the modern world. The effectiveness of various used seismic protection technologies has been repeatedly confirmed after strong earthquakes in many countries of the world, including Russia. That is why scientific engineering does not stop working to improve the seismic protection of buildings and structures. Today seismic isolation systems are variety of devices. It is beneficial to apply different approaches to seismic isolation for different structural solutions of buildings and structures, different climates and different seismic hazards. The systems developed and used in Russia currently have economic and social efficiency, making it possible to achieve, in comparison with traditional structures, an increase in the seismic reliability of structures, a reduction in the cost of anti-seismic measures, a reduction in damage from earthquakes, and more accurate assessments of investment and insurance risks. The paper presents the huge experience of devices and their combinations using not quite traditional approaches to seismic isolation of buildings and structures, seismic supports made of concrete, seismic protection based on geometrically nonlinear systems, combinations of various devices.

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 examines and analyzes the main historically established methods used to reduce the effect of seismic effects on buildings and structures used in world practice.

Aim. The main purpose of this work is to classify the main, historically established methods used to reduce the seismic impact on buildings and structures. Scientific research methods used in the article: theoretical. Materials and methods. The research was conducted on a theoretical basis, as a result of which the authors proposed the main, historically established methods for reducing the effect of seismic effects on buildings and structures. The relevance and novelty of the article is due to the systematization of historically obtained and new data on seismic effects on buildings and structures and methods used to reduce the effect of this impact, as well as the use of modern literature sources by both Russian and foreign authors.

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 scientific novelty and significance of the ongoing scientific research lies in its focus on the development of the regulatory framework in terms of establishing and updating scientifically based technical requirements for ensuring fire safety of buildings and structures, aimed at guaranteeing the life and health of citizens without taking into account the risks of loss of property, which will create conditions for reducing the cost and timing of the creation of capital construction projects.

Aim. Development of recommendations for determining the fire resistance limits of building structures of buildings and structures of various classes of function al fire hazard, necessary to guarantee the life and health of citizens without taking into account the possible risks of property losses.

Materials and methods. An analysis of an array of results for calculating evacuation time and data from official statistical records of fires and their consequences in buildings of various classes of functional fire hazard was carried out.

Conclusions. Based on the analysis, an assessment is made of the possibility of changing approaches to the technical regulation of fire resistance requirements for buildings and structures, based on the conditions for ensuring the life and health of citizens without taking into account the risks of property loss, and factors influencing the use of this approach in the development of regulatory documents on fire safety are identified.

Currently, seismic isolation technologies are becoming increasingly widespread in earthquake engineering. The technology, known since ancient times, has been developed in the modern world. The effectiveness of various seismic protection technologies used has been repeatedly confirmed after strong earthquakes in many countries of the world, including Russia. That is why scientific engineering does not stop working to improve the seismic protection of buildings and structures. The article presents the main conceptual seismic protection systems, examines existing design solutions for the implementation of seismic isolating devices, taking into account the peculiarities of their operation during earthquakes, since the reliability of the operation of seismic protection systems largely depends on the characteristics of the seismic impact, its frequency component, direction, intensity, etc. The systems developed and used in Russia currently have economic and social efficiency, making it possible to achieve, in comparison with traditional structures, an increase in the seismic reliability of structures, a reduction in the cost of anti-seismic measures, a reduction in damage from earthquakes, and more accurate assessments of investment and insurance risks.

The article briefly shows the main provisions of the 1st edition of the
draft National standard: «Anti-Seismic and Seismically Isolated Construction
Design Code. Design rules». National standard is presented in the Russian
Federation Ministry of Construction. As a result of its using, on a voluntary
basis, compliance with the Federal Law «Technical regulation on safety of
buildings and structures» is provide. The draft National standard prepared EERC
TsNIISK of «Open Joint Stock Company - Research Center of Construction» in
accordance with the Technical task for the development of the document. The
draft National standard was developed 

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.

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.

As a result of the release of GOST 34028-2016 «Reinforcing bars for reinforced concrete structures» the manufacturability of new kinds of reinforcing bars, taking into account the needs of different areas of construction were increased. The materials of the present study prove the ability of reinforcement with a multi-row (six-row and screw four-row) arrangement of transverse ribs on its surface to maintain adhesion with concrete even at the stage of exceeding the limit values of deformation. This factor, as well as high endurance at cyclic dynamic effects, possibility of connection using couplings of four-row screw reinforcing bars and anchoring it with nuts, expands the possibilities of using the new valves not only in earthquake engineering, but also in nuclear power, transport and other types of construction. The new reinforcing bars of domestic production are able to gain a leading position not only in the domestic but also in foreign construction markets.

To meet the safety requirements in the design of reinforced concrete structures in seismically hazardous areas, it is important to ensure the dissipation of seismic input energy in structures when their progressive collapse is included. For this purpose, plastic deformation of the calculated sections of reinforced concrete structures with the opening of cracks in reinforced concrete is allowed much higher than the maximum permissible. These conditions can be met, when a number of design requirements are met. These requirements are reflected in regulatory documents for the design and manufacture of building structures and materials, including reinforcing bar. The article present a comparative analysis of the requirements that have recently been published at normative technical documents, namely the SP 14.13330 and the standard of the organization «Earthquake engineering», and also requirements of the state standard «Reinforcing bar for reinforced concrete design» in relation to design for seismically dangerous areas are stated and explained. So, as one of the possible options, the authors consider the advantages of using screw fittings, for connecting rods with screw fittings it is recommended to replace welded joints with screw couplings.

Experts of TSNIISK named after. V.A. Koucherenko JSC “RCC”, IPE RAS, АIIS and workgroup members have prepared and passed the first drafting project of changes and addendums SP 14.13330.2014 in FСS of the Ministry of Construction of the Russian Federation for accommodation on site for public discussion.

The article presents the results of dynamic tests on earthquake resistance of full-scale fragment of building with seismic isolation. Tests performed by Laboratory of aseismic constructions and innovative methods of seismoprotection EERC TSNIISK Named After V. A. Koucherenko on fragment which manufactured by developers of construction system in Tomsk. Tests were carried out in the framework of research complex for development and launch production technology used for construction of 12 storey apartment buildings at sites with increased seismic activity 7–8 points.

Results of experimental studies of fragments of reinforced concrete walls at action of the static and dynamic loadings modeling nature of seismic influence are given. Comparison of theoretical results of calculation on a distortion of fragments of walls with experimental data is given.

In the article demonstrated the results of experimental studies of seismic ­stability of building fragment with walls with aerocrete blocks. All works were conducted on base of EERC TsNIISK named after V.A. Kucherenko of «Joint Stock Company – Research Center of Construction».

The article briefly shows the main provisions of the 1st edition of the draft National standard: «Anti-Seismic and Seismically Isolated Construction Design Code. Design rules». National standard is presented in the Russian Federation Ministry of Construction, as a result of which, on a voluntary basis, compliance with the Federal Law «Technical regulation on safety of buildings and structures».

The draft National standard prepared EERC TsNIISK of «Open Joint Stock Company — Research Center of Construction» in accordance with the Technical task for the development of the document. The draft National standard was developed for the first time as a new document.

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The paper presents the basic provisions of the Federal Target Program “Increasing stability of residential buildings, basic facilities and life-support systems in seismic areas of the Russian Federation for 2009-2018”. The research tools for the integrated seismic safety monitoring of the Russian Federation’s territory, the proposals and supplements for updating of the current regulatory documents are formed within this program.

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The paper presents the test results for masonry specimens from ceramic products of Slavyansky Kirpich JSC, the Krasnodar Territory. The tests were conducted within the framework of studies in strength and deformability of wall masonry from hollow aerated brick and stone to substantiate a possibility of their use in the Russian Federation’s seismic areas.