bluuebunny/crossref_metadata_2025_split huggingface dataset:
Complete diagrams of strain under axial tension of steel-fiber reinforced concrete with different fiber types and content
Authors: Krasnovsky Rostislav , Kapustin Dmitriy , Korotkikh Dmitry , Efishov Luka 
Published: January 2021

Abstract
The work provides the results of experimental investigation of strain properties of steel-fiber reinforced concrete with high-strength cement-sand matrix and various content of fiber (up to 6% by volume). The work demonstrates influence of the type and content of steel fiber over changes of characteristics of complete diagrams of strain under axial tension. It shows that introduction of fiber gives elastic properties to the matrix that (properties) in a greater degree depend upon the type of fiber than upon percent of fiber reinforcement.
Principle of computer synthesis of network polymers possessing a specified interval of glass temperatures
Authors: Askadskii Andrey , Zhdanova Tatyana , Matseevich Tatyana 
Published: January 2021

Abstract
For the first time, the model and the principle of constructing a corresponding computer program for the electronic synthesis of polymer networks with a given glass transition temperature range have been proposed. A repeating network fragment is synthesized from the smallest basic fragments that are connected to each other using a steering matrix of interactions. As an example, 10 cross-linked points, 16 basic fragments for constructing inter cross-linked chains and 5 repeating fragments of polymer networks are presented, the glass transition temperatures of which are within the specified range from 450 to 480K.
Seismic resistance estimation of existing turbogenerator foundation structures under ductility level earthquake impact by nonlinear static method
Authors: Zubritskiy Maksim , Ushakov Oleg , Sabitov Linar , Bambulevich Maksim , Akhtyamova Leysan 
Published: January 2021

Abstract
The article considers the multimodal nonlinear static method as a seismic resistance estimation method of existing turbogenerator foundation structures. The object of research is the turbogenerator foundation on the Tom-Usinsk State District Power Station. The article proposes a modified algorithm for the characteristic point search by the nonlinear static method. According to the calculations results, the existing foundation structures after a partial equipment replacement and the construction site increased seismicity are operational.
Studying the influence of taking into account the elastic-plastic behavior of strut elements on the retaining system equilibrium
Authors: Ter-Martirosyan Armen , Sidorov Vitalii 
Published: January 2021

Abstract
Currently, there is a rapid compaction of urban areas, which inevitably leads to the need for more active and integrated use of the underground space. In conditions of dense urban development, for the construction of underground structures or underground parts of buildings, it is necessary to design and realize deep excavations with vertical walls under the protective of the retaining structures, including supporting systems. The most common support is a system of metal elements -distribution beams and pipes (struts). The article deals with the calculation of the real excavations, taking into account the elastic and elastoplastic behavior of the support elements, the influence of this factor on the resulting internal forces and the stability of entire retaining system. Questions about the correctness of calculations by elastic models for structural elements used in geotechnics, are raised.
The influence of the human factor on the safety of operation of the industrial buildings and structures
Authors: Gvozdev Evgeniy 
Published: January 2021

Abstract
The article examines the results of the determining the indicator of the influence of the human factor on the safety of operation of industrial buildings and structures, their reliability to ensure the technological process. The purpose of the study is to provide a rationale for the occurrence of failures in the functioning of physical objects, after defects, which are associated with the human factor. To determine the indicators of the influence of the human factor on the safety of the operation of the buildings and structures, it is proposed to assess the risks not only taking into account technical factors, but also to supplement the scenarios of the occurrence and implementation of events associated with the human factor, shortcomings committed at various levels of the organization of public administration. To solve the problem, it is proposed to use the parameterization of the dependencies between the indicators of the occurrence of emergency events based on the human factor to the total number of all events that have occurred. The consistent theoretical description of the formulas is presented, which makes it possible to establish a relationship between the safety margin of the buildings and structures, the probability of its destruction under the realized influences associated with the human factor. The innovative approach is described, indicating the need to integrate the errors of the personnel operating the facility into the overall structure of risk assessment.
Analysis of the seismic stability of foundations according to laboratory soil tests
Authors: Ter-Martirosyan Armen , Sobolev Evgeny 
Published: January 2021

Abstract
Seismically hazardous areas are widespread on the territory of Russia. These are the North Caucasus, Altai, Sayan, Eastern Siberia, Kamchatka, Sakhalin. The issues of earthquake-resistant construction in difficult engineering and geological conditions, design in new earthquake-prone zones and construction in already developed territories are important aspects of the increasing intensity of development. Against this background, the problem of assessing the dynamic stability of soils becomes a priority task of modern soil dynamics and geotechnics. The article focuses on highlighting the main stages of the analysis of the dynamic stability of the foundations of structures of increased responsibility, taking into account complex geological conditions. The work contains the theoretical foundations of the methodology for assessing stability under dynamic loads, a description of laboratory equipment and test methods, the process of processing the experimental results. The study uses the results of assessing the dynamic stability of foundations obtained in the course of practical activities of the Scientific and Educational Center “Geotechnics” of the Moscow State University of Civil Engineering..
Polyspast -personal fall protection equipment. Features of certification and certification tests
Authors: Zherdev Kirill , Korolchenko Olga , Gadzhiyev Ragim 
Published: January 2021

Abstract
In the paper there was considered polyspast system as a means of personal protective equipment against falling from height. The structural place of these products in the classification of protective equipment, their functional purpose in ensuring the safety of work at height is analysed. The issue of statistics of accidents at work at height is touched upon. The relevance of the issue of continuous work on safety in this sector of work is shown. There are similarities in the need for safety and rescue operations in both the sports and industrial sectors. The purpose of this work is to form competent recommendations on various aspects of certification and certification tests of polyspasts to improve the safety of users, athletes (including children) and rescuers when performing various tasks and work at height. Within the framework of this work, the procedures for forming technical requirements for certified products, the totality of interaction of the main technical requirements of the technical regulations with the lists of standards specified in the Appendix to the technical regulations are considered. The analysis of two examples of polyspasts, certified in the market of the Eurasian Customs Union. The weak points of their certification due to the problems of the normative and technical state of the main documents in this area are shown. The conclusions provide a brief analysis of the problems of certification and certification testing of polyspast systems. Recommendations of both structural and local nature are formulated to improve the safety of certified products.
Reinforcement of brick partitions of buildings located in seismic areas with composite materials based on carbon fibers
Authors: Kabantsev Oleg , Simakov Oleg 
Published: January 2021

Abstract
Brick masonry is one of the most commonly used materials for creating internal partitions of buildings, including those located in seismic areas. The codes of a number of countries, including Russia, prescribe design requirements for strengthening partitions with external discrete steel reinforcement. At the same time, this solution is both labor-intensive in the production of works, and increases the seismic load on the partition (increasing the mass of the partition). This article explores the option of replacing the steel external reinforcement of partitions with composite roll materials – grids and tapes on an epoxy basis. The analysis of the strength values obtained in the course of experimental studies is carried out, and the result of calculations of the load-bearing capacity of characteristic partitions of real buildings with and without external reinforcement is given.
Finite element analysis of a frame connection of a girder with a rack under beyond design basis impact
Authors: Chernykhovsky Boris , Evtushenko Sergej , Alekseeva Anastasia 
Published: January 2021

Abstract
Over the past decade, the number of accidents in steel-framed buildings has been decreasing thanks to advanced approaches to cause analysis. In the presented article, a brief overview of the existing common design solutions of frame joints of the rack with the crossbar is made. A finite element design model of the structure under consideration has been made in accordance with the most common design solutions based on the experience of designing construction design organizations. The analysis of the local buckling of a steel structure element, which had cases of collapse in real life, was carried out. The results of the structural analysis of the structure without the presence of any defects were assessed, and the dependence of the bearing capacity of the structure on the presence of defects and the degree of their development was presented in a graphical form. The presence of a sensitive parameter of the structure under study was determined and the direction of further research of the frame connection of the rack with the girder was determined.
Assessment of translate-ability of “green” standards requirements into a machine-readable format for automated verification
Authors: Rybakova Angelina , Makisha Elena 
Published: January 2021

Abstract
Application of BIM methods gradually extends to all stages of life cycle of construction object, including the stage of expert review when compliance to mandatory state standards is evaluated. Moreover, there have been recently recommendations established related to the environment impact of a construction object, or so-called “green” standards. Their wide implementation requires verification of information models not only for compliance with mandatory state standards, but also to recommend “green” standards in the framework of certification. A necessary condition for organizing this process is the translation of the relevant requirements of the “green” standards into a machine-readable format. In this viewpoint, it is important to assess this possibility and develop corresponding approaches. The purpose of this study was to assess the requirements of existing “green” rating systems for the ability to translate into a machine-readable format for further automated verification of information models. To achieve this goal, an analysis of existing “green” certification systems was performed. As a result, according to a set of criteria, the “green” systems were identified, the translation of the requirements of which is appropriate and promising. For these standards, the possibility of translating their requirements into a machine-readable format was evaluated and recommendations were made to improve it.
Determination of the amount of internal heat input in the office space
Authors: Frolova Anastasia 
Published: January 2021

Abstract
A feature of office buildings is the presence in them of constant internal heat inputs during working hours, which, in accordance with the current standards for thermal protection of buildings [1], are not taken into account when determining the required value of the heat transfer resistance of the building envelope. However, they perform an important role in the choice of thermal protection of a building and directly affect the energy consumption of systems for maintaining the internal microclimate of premises [2-20]. The purpose of this study is to confirm the presence of internal heat gains (technological and household) during the day and year at a level close to the studied level [2-4] and the correctness of maintaining a given temperature regime in office premises, in which internal heat gains are known during the working day.
Determination of stiffness parameters of reinforced concrete structures using the decomposition method for calculating their survivability
Authors: Fedorova Nataliya , Kolchunov Vitaliy , Tuyen Vu Ngoc , Iliushchenko Tatyana 
Published: January 2021

Abstract
A method for determining the generalized stiffness of reinforced concrete structural systems of monolithic buildings using the decomposition method is presented. The secondary calculated scheme for determining dynamic additional loading in the frame of a monolithic building is adopted in the form of a substructure isolated from the frame of a building in the zone of possible local failure under a special action. For such a system, generalized stiffnesses are defined, depending on the angular stiffness of the support restraints and the stiffness of the overlying floors (adjacent structural elements). Analytical dependencies and a method for determining the overall stiffness of reinforced concrete substructures with specified boundary conditions are proposed. The influence of boundary conditions on internal force factors of the substructure is investigated. Recommendations are given for improving the survivability of the considered structural systems of monolithic buildings, as well as suggestions for their protection from progressive collapse.
Seismic responses of multi-story building isolated by Lead-Rubber Bearings considering effects of the vertical stiffness and buckling behaviors
Authors: Nguyen Van-Tu , Nguyen Xuan-Dai 
Published: January 2021

Abstract
Elastomeric isolation bearing is one of the most commonly efficient devices and widely applied for protecting constructions in the earthquake regions. Its significant lateral deformation during operation, however, may affect its load-carrying capacity, especially the stability of the bearing. The current preliminary design method often focuses on shear behavior without effects of vertical stiffness and stability conditions that do not reflect the practical operation of devices. The paper presents the effect of vertical stiffness and buckling behavior on the seismic performance of lead-rubber bearing (LRB) used for seismic isolation in multi-story buildings. The effective parameters of LRB are estimated by the single-mode spectral analysis method, through a bilinear model, calculated by a typical target spectrum of Eurocode 8. A two-spring equivalent model is employed to study the effects of the vertical stiffness and critical buckling load that is varied as a function of lateral deformation. A set of time history nonlinear analysis is conducted to investigate the effects of vertical stiffness and critical buckling load on the seismic responses of building structures. The findings show the taking into account of the vertical stiffness and buckling behavior results in an increase of lateral displacements and a decrease of the lateral force and the floor acceleration of the isolated building.
Determination seismic effect of buildings and structures, taking into account changes model of external relations within the life cycle
Authors: Kabantsev Oleg , Sergeev Evgeny 
Published: January 2021

Abstract
This research paper discusses the problem of the strain state formation in the bearing system through its lifespan. It is demonstrated that in the general case the seismic events (being quite rare natural acts) can impact the structures which, by the time an earthquake hits, will experience strains developed during the period preceding the earthquake. Consequently, the accurate seismic load calculation for the bearing system in view of the seismic events shall account for the strain state developed in the structures prior to the seismic event. Analysis of the customary computational techniques used in seismic load calculations for bearing systems and employing the response spectrum method reveals, that in the context of a single-stage calculation method it is possible to introduce only one model of external relations that corresponds to either the long-term loading effect or to the short-term seismic loads. Such approach is not aligned with the true-life pattern of external relations, which is subject to changes through the life span. For the purposes of accurate prediction of seismic response in buildings, it is proposed to use a multistage calculation method with the stage-to-stage inheritance of the stress-strain state. At that, at any stage it is possible to modify the properties of external relations. Compared are the calculation results of the seismic impact test model employing the customary calculation techniques and the multistage calculation method with adjustment of the external relations model to correspond with the lifespan mode. The outcome of the research proves that the use of the customary single-stage calculation method leads to significant simplification of the bearing system strain model, as well as to inaccuracy of the seismic response prediction result. Based on the research outcome, the single-stage calculation method is advised. It permits to take into account developments in the external relations model through the building lifespan.
Transverse vibrations of an underground cylindrical structure
Authors: Abduvaliev A , Abdulkhayzoda A 
Published: January 2021

Abstract
The transverse vibrations of an extended cylindrical underground structure under the action of concentrated forces changing according to a harmonic law are considered. The problem of transverse vibrations of a cylindrical rod interacting with an elastic homogeneous medium was solved by the Fourier method. Approximate solutions are obtained using the method of compensating loads. The influence of soil conditions and geometrical dimensions of the structure, the location of active forces on the amplitude-frequency characteristics of the object are analyzed.
Express-method of determining the water-yielding capacity of natural water sludge in modern dewatering technologies
Authors: Ryltseva Yuliya 
Published: January 2021

Abstract
Water treatment of surface sources for the purposes of public water service provision is impossible without waste build-up – sludge of water treatment plants. This kind of waste poses a considerable threat to the environment as it represents a complex organomineral structure with a high concentration of chemical reagents used for source water clarification and decolourization. In the present day, it is still international practice to discharge wastewater into surface water objects or onto the land surface, which causes severe damage to the natural environment. A tightening of environmental regulations encourages housing and utility services sector to undertake measures related to waste processing (waste dewatering). To implement these purposes mechanical machines (centrifuges, decanting tanks, filter presses, vacuum filters) are widely applied. An initial sludge quality, more particularly a filterability indicator – specific resistance to filtration – is a critical factor for the successful functioning of these machines. The higher the specific resistance to filtration, the worse the sludge gives away moisture, the more reagents and (or) mineral additives should be used before sending sludge for dewatering. Determining indicator of specific resistance to filtration using standard methods is quite a long process requiring the use of laboratory equipment. In this article, the author proposes an express-method enabling to determine within a short time span the water-yielding capacity of sludge based on the capillary suction speed of filtrate, standing out from its components. This method allows simplifying the start-up and commissioning of the modern sludge dewatering equipment as well as operation on the whole.
Planning organization of facilities for the municipal solid waste processing for use in the structure of small cities of Russia
Authors: Finogenov A 
Published: January 2021

Abstract
The range of problems, related to the environmentally dangerous accumulation of solid domestic waste (SDW) in Russian cities and settlements and the lack of effective ways of handling them, has been analyzed. The importance of this problem is substantiated for the difficult location conditions of geographically remote small towns and settlements of Russia, where the rational solution for solid waste collection conditions, transportation and processing still has not been found. The planning organization concept for small cities with the inclusion in their structure a modern system of objects for processing solid waste is proposed. A new methodological approach to the formation of functionally completed and environmentally friendly small residential agglomerations in the Russian regions is substantiated. The proposed methodology is focused on the use of advanced native technologies, using domestic waste as a renewable source of fuel for the production of electric and thermal energy. The new methodological approach is based on the complete exclusion of domestic waste landfill disposal in small towns in Russia and provides an effective scheme for waste collecting, advance preparation and container delivery for it complex processing with extensive use of the local railway transport network. The results of the study allow us to identify new directions in the field of small towns design and development in Russia, in relation to the requirements of a sustainable ecological environment ensuring.
Axisymmetric turbulent methane jet propagation in a wake air flow under combustion at a finite velocity
Authors: Hamdamov Muzaffar , Khujaev Ismatulla , Bazarov Orifjan , Isabaev Kasimbek 
Published: January 2021

Abstract
This article proposes a numerical method for solving the problem of an axisymmetric methane jet propagation in an infinite wake air flow. The dimensionless equations of the turbulent boundary layer of reacting gases in von Mises coordinates and the k-e turbulence model were used in modeling. The equations for N components of the gas mixture were reduced to two equations by introducing the Schwab-Zeldovich functions. To solve the problem in von Mises coordinates, a two-layer, six-point implicit finite-difference scheme was used, which provided the second order of accuracy of the approximation in coordinates. An iterative process was realized due to the nonlinearity of the equations for the conservation and transfer of substances. The effect of the radius of fuel nozzle on the indices of turbulent jet and flame was investigated. It was found that in an infinite wake flow of fuel with a decrease in the nozzle radius, the rate of chemical reaction and the highest temperature in the calculation area decrease, and the amount of unburnt fuel increases.