#2-2022
#2-2022

#2-2022

DOI: 10.37153/2618-9283-2022-2

№2-2022

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Authors:    Shamil A. Khakimov    
Rubric:     Anniversaries   

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On the need for coordinated actions of designers, manufacturers and installers of structures when changing solutions during construction

Authors:    Vedyakov Ivan I.    Mihail R. Uritskiy    Oleg V. Korzhov    Evgenia A. Kolosova   
Rubric:     Technical regulation and design standards development   

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This article is intended to draw attention to the inadmissibility of delineating the areas of responsibility of designers, manufacturers and installers, since changing design decisions requires careful re-examination of the issues of installation, design, manufacture and calculation. This issue is most acute for buildings and structures with an increased level of responsibility. According to p. 10.5 GOST 27751-2015 "Reliability of building structures and foundations" for buildings and structures of KS-3, scientific and technical support of objects at all stages of building construction, starting from design and ending with monitoring during operation, should be provided.

This article discusses the precedent of making changes to the design documentation, which entailed

the destruction of structural elements. The bearing capacity of the mounting joints of the struts of the frames of the football arena covering was studied on full-scale samples of structural units. According to the test results, the causes of the destruction of part of the structures were established.

 


Problems of updating seismic norms in the conditions of application of new structural systems of residential and civil buildings

Authors:    Shamil A. Khakimov    
Rubric:     Technical regulation and design standards development   

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The article considers the issues of the need to update certain provisions of seismic norms for the design and construction of new types of structural systems of residential and civil buildings, as well as adjustments to the parameters of seismic hazard.


Accounting of Random Factors in the Design of a NPP for an Aircraft Impact

Authors:    Birbraer Adolf N.    George D. Kostrov   
Rubric:     Theoretical and experimental studies   

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The article is devoted to taking into account random factors when an aircraft impact is included in the design basis of a nuclear power plant (NPP). The fall of transport and high-speed military aircrafts in cases of unintentional (emergency) and deliberately organized (terrorist act) crash is considered. It is shown that in case of an unintentional fall, the impact of an aircraft into structures of ordinary sizes can be ignored due to the too low probability. Two methods of probabilistic setting of design loads on building structures are proposed. A technique for probabilistic setting of floor response spectra (FRS) is proposed, by means of which dynamic loads on technological equipment are calculated. It is shown that the probabilistic approach can significantly reduce the design loads while maintaining the safety of NPP. The procedure for determining the coefficients of combinations for summing up of the same name internal forces, calculated by three components of the FRS, is de­scribed


Peculiarities of behavior of cross-laminated timber (CLT) under static and dynamic loads simulating seismic impacts

Authors:    Alexander A. Bubis    Ilnur R. Giziatullin    Alla N. Khvorova    Ilya Yu. Petrov   
Rubric:     Theoretical and experimental studies   

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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.


Research of strength and elastic characteristics of russian-made cross laminated timber slabs

Authors:    Mikhail A. Filimonov    Pavel N. Smirnov   

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the current state and experience of foreign researches of cross-laminated wood as products for the construction industry are analyzed. The basic principles of production of CLT material and its design features, as well as the advantages of CLT structures in comparison with traditional structural materials are given. The reasons limiting the use of this material in the Russian Federation are indicated. The results of research work are presented, the purpose of which was to study the strength and elastic characteristics of a new structural material made of CLT by conducting experimental studies to determine the bearing capacity of structures made of CLT, as well as the development of modern standard test methods for determining the bearing capacity of structures made of CLT, as a bimodular orthotropic material. Information is provided on the test methodology used and the results of experimental studies to determine the floor slabs bearing capacity in bending out of the plane of the sheet; wall panels load-bearing capacity in compression in the plane of the sheet and determination of the wall panels rigidity  in shear in the plane of the sheet for samples with different grades of wood, the number and layuot of outer layers. The data of experimental tests of CLT samples to determine the floor slabs bearing capacity for bending and wall panels for compression and their rigidity in compression are presented, the nature of deformation and destruction depending on the design features of the CLT material is studied. The prospects for using the results of the work in the development of normative-technical and organizational-methodical documents are determined.


Experimental studies of a kinematic type seismic isolation system

Authors:    Vladimir A. Lapin    Boris N. Kim    Daugavet V.   
Rubric:     Theoretical and experimental studies   

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The results of studies of the dynamic characteristics of a three-storey fragment of a frame building made according to the SBK-SCF system "Prefabricated frigless frame with seismic-insulating kinematic foundations" are presented. Magnetic dampers are used at the support level.The building fragment was tested by loading the system with a horizontal static load using a stationary winch with subsequent load relief. It is established that the value of the oscillation period varies within 1.8-2.1 seconds depending on the amplitude of the impact.


Issues of ensuring seismic resistance of the building of the airport complex in the city of Yelizovo

Authors:    Alexander A. Bubis    Ilya Yu. Petrov    Alla N. Khvorova   
Rubric:     Design, building and reconstruction of a seismic constructions   

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Many regions of the Russian Federation are located in seismic areas. Therefore, one of the most important issues of ensuring the mechanical safety of buildings and structures being built in seismically active areas is its seismic resistance. Special methods of seismic protection are becoming more widespread, the use of which allows you to adjust the dynamic response of buildings during seismic impact. In this paper, an approach is considered to ensure seismic protection of the terminal building in the city of Yelizovo in the form of a hydraulic damper.

Research methods: constructive solutions of the building were analyzed in terms of ensuring the seismic resistance of the building. A comparative analysis of the calculations of the building for seismic impact with and without seismic protection elements was carried out. The calculation for the seismic effect was carried out in the time domain using direct integration of the equation of motion, while the damper operation was modeled by an element with hysteresis work. The analysis of the efficiency of seismic protection was carried out.

Results: The results of scientific and technical support are presented within the framework of which the calculations of the spatial model of the terminal building in the city of Yelizovo were carried out for seismic impact with an estimated intensity of 9 points on the SSI-2017 scale [3]. The method of seismic protection in the form of devices regulating the dynamic response of the building (hydraulic damper) is considered. The selection of a seismic protection system was performed and the decrease in accelerations and forces in the main load-bearing structural elements under seismic action was shown.


Modelling of damping devices in the seismic analysis of an airport terminal structures

Authors:    Valery N. Simbirkin    Yuriy V. Panasenko    Victor V. Kurnavin   
Rubric:     Design, building and reconstruction of a seismic constructions   

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An analysis of the efficiency of using damping devices to increase the design seismic resistance of the projected building of one of the airport terminals is presented. In this case, an anti-seismic system use is the only way to implement architectural and space-planning solutions on a site with a more than 8th seismic intensity level in the design project. Models of hydraulic viscous dampers in which the reactive force depends non-linearly on the velocity of movement of the rod, linear viscous dampers and elastic-perfectly plastic elements are considered. 

The methods considered in the paper are implemented in the STARK ES software and are available for a practical use in structural design and research.