bluuebunny/crossref_metadata_2025_split huggingface dataset:
Investigation of glued in bars strength and deformability indexes within framework of research of wood reinforcement with cable reinforcement
Authors: Koscheev A A , Lukin M V , Roshchina S I 
Published: December 2019

Abstract
The increasing demand for the low-height housing construction frame technology keeps current the issue of saving timber in building construction. The method of reinforcing beams with reinforcing steel is a promising direction of research in the field of ensuring the gain in strength and the cost indexes reduction of structures. In 2017 as a graduate student of the Department of building structures of VlSU Koscheev A.A. proposed for the investigation a new type of reinforcing wooden beams by the steel cable reinforcement in solid wood along the original curvilinear trajectory. As of today, a number of numerical investigations in this area was carried out and the process of the full-scale experimental investigations was launched. This research article is devoted to the first cycle of the experimental analysis in this area: investigation of the influence of the steel wire rope strength characteristics on the behaviour of the adhesive interlayer of the epoxy composition when conducting tensile tests – pulling out a straight bar from the solid wood. On the basis of the data obtained, conclusions on the applicability of the rope reinforcement in solid wood constructions were drawn and the main directions for further research were determined.
Calculation for stability of centrally compressed rods of steered stiffness in existence of linearly deformable connections
Authors: Grebeniuk G I , Liuft N A , Nikolskii A V 
Published: December 2019

Abstract
The authors consider one-parameter problems of calculating the stability of centrally compressed rods of step stiffness with linearly elastically compliant support constraints. The problem of calculating the stability is set as bifurcation. Euler’s exact solutions are obtained for different variants of the design scheme of a rod of two-stage rigidity. An iterative algorithm for calculating the stability beyond the limit of proportionality is proposed, based on the concept of the conditional flexibility of rod sections, using the experimentally obtained diagram σ - ε and the table of coefficients ϕ. Numerical examples illustrating the proposed methods and algorithms are considered.
Numerical simulation in diagrams for concrete deformation in computations of strength of reinforced concrete elements in deformation model
Authors: Eryshev V A 
Published: December 2019

Abstract
The paper establishes correlation between the integral parameters of nonlinear diagrams for concrete deformation in the versions of Russian and foreign regulatory documents applied to computation of strength of the reinforced concrete elements in the deformation model. It is recommended to use the fragments of the areas boarded by the branches of diagrams, as well as the coefficient of the diagram completeness as integral parameters of the diagrams for concrete deformations. The diagram area with the predetermined values of the element curvature is equivalent to the value of the ultimate strain in the compressed zone of concrete in the bendable elements under off-center compression, and the geometry of the stress diagram corresponds to this diagram. The study offers analytical expressions establishing the connection of strength and deformation parameters for the classes of concrete, which have standard values of deformation and stress in the reference points of curvilinear diagrams. The article presents the results of the computation and establishes the interconnection between the parameters of diagrams obtained by analytic correlation between stresses and deformations in the considered regulatory documents. There are recommendations for defining standard integral parameters of diagrams in calculating the strength of reinforced concrete elements using the deformation model.
Transformable structures
Authors: Gnedina L Y , Dolgusheva V V , Danko V V 
Published: December 2019

Abstract
This research explores different types and forms transformable structures as an integral part of any building or construction. The structures, which are capable of changing its spatial position or geometric shape, become an individual branch of architecture and design. However, with all diversity of known structural shape-shifts, there is no comparison of its types with existing buildings. Thus a purpose of this research is studying about worldwide experience in development of transformable structures. Another goal is comparison of known classifications with examples of shape – shifts in built projects based on following study. The internet search along with the review of related literature references was done. By the completion of survey the authors matched given examples with the classification of transformable structures by methods of realization and approaches to motion arrangement. The scissor – structures category is derived into separated stratification as well. The study showed that the structures that can rearrange its shape have a great potential as kinematic objects of architecture and engineering.
Time of dynamic impact to elements of RC frame at column buckling
Authors: Fedorova N V , Savin S Yu 
Published: December 2019

Abstract
A method for calculating the time of the dynamic additional impact to the elements of a reinforced concrete framing structural system under special impact caused by a sudden loss of stability of a compressed bearing element is presented. Using the discrete-linear moment-curvature diagram for reinforced concrete compressed-bended element, the analytical relationships for different stages of deformation of a reinforced concrete element before and after cracking are carried out. The obtained relationships for time of the additional dynamic impact to the elements makes it possible to determine the dynamic strength of concrete and reinforcement and the stiffness of the sections of reinforced concrete elements of structural systems under such impacts more accurately and consequently ensure more exact computational analysis to progressive collapse.
Strength and deformation property enhancement of compressed steel tube-concrete elements using super concrete and thin-shell structure
Authors: Narkevich M Yu , Sagadatov A I 
Published: December 2019

Abstract
The article analyzes the changes in the strength and deformation property of compressed steel tube-concrete elements when the quality indicators of the original concrete (strength class for axial compression) and the metal shell are changed. The methodology of testing for central compression of steel tube – concrete columns with a core of ordinary and super concrete with a thin-shell structure is described. Comparative dependences of the relative deformations in the axial and circumferential directions depending on the relative loading levels, destructive load values for samples from ordinary and super concrete are presented. According to the results of the research, it was determined that with an increase in the class of concrete, the efficiency ratio of the concrete is reduced by an average of 12%, however, the increase in bearing capacity remains quite noticeable. In addition, the use of high-strength concrete class C80 increases the deformability by about 10% compared with concrete class C40 steel-concrete columns, with significant savings in metal.
Modelling framework joints in ANSYS software complex
Authors: Buzalo N A , Alexeeva A S , Chernykhovsky B A 
Published: December 2019

Abstract
Modern methods of building design are largely based on the creation and analysis of a 3D model of a structure in a specialized CAE complex using the finite element method. The article describes the problem of designing the junctions of crossbars and columns in the metal frame of high-rise buildings. A computational model of a flange joint is created in the form of a solid three-dimensional model in the ANSYS software package, a visual display of equivalent stress fields was obtained, and the calculation results are analyzed. The method of strength analysis of junction points of frame systems using CAE systems makes it possible to more effectively take into account many options in the design due to the system of parametric values, and also analyze in more detail the stress-strain state of the calculated structure.
Construction of discrete analogs of differential equations for bending of plates and shells with discontinuous parameters based on spline approximation method
Authors: Katerinina S Yu , Voronkova G V , Rekunov S S 
Published: December 2019

Abstract
A new approach to the construction of discrete analogs of the differential equations of bending of plates with discontinuous parameters based on the two-dimensional spline approximation method is proposed. At its core, it is close to the Finite Element Method, since all constructions at the beginning are carried out for a single cell of a finite element, and then applied to the entire area surrounding the base node. The use of such a technique makes it possible to reduce the number of unknowns in each node of the grid area, and the introduction of parameter gaps into the resolving system makes it possible to take into account their effect on the stress-strain state of the structures. This approach to the construction of discrete analogs of partial differential equations allows developing a universal method for constructing discrete analogs of these equations. This technique will significantly reduce the amount of computation in the strength analysis of buildings and structures of various functional purposes using lamellar and shell elements.
Experimental investigations of composite wooden beams with local wood modification
Authors: Gribanov A S , Rimshin V I , Roshchina S I 
Published: December 2019

Abstract
The dynamic development of wooden structures is inherently connected with emergence of the new structural elements having high operating parameters, increased strength and rigidity. Composite wooden structures based on wood and reinforcing material made from glass, aramid or carbon fiber on a polymer matrix fully comply with the requirements. The complex stress-strain state that occurs in the reinforced wooden elements necessitates a plainly required experimental confirmation of the assumptions and suppositions taken as theoretical. Comparative analysis of the theoretical and experimental investigation of wooden beams reinforced with carbon fiber polymer composite and modification of the wood compressed zone has been performed as a part of the research. Test installation for testing beam structures is presented, “load-strain relation” and relative deformation diagrams in the cross section of wood-composite beams are constructed. The stress-strain state of the structures at various stages of loading is analyzed. Sufficient convergence of the results of the experimental and theoretical investigations is established. The discrepancy in the first group of limit states does not exceed 3.5%, in the second group does not exceed - 9%.
Stability of compressed sheathings of wood composite plate-ribbed structures
Authors: Labudin B V , Popov E V , Sopilov V V 
Published: December 2019

Abstract
Wood composite plate-ribbed structures working under the conditions of lateral bending in coverings and floors in buildings of various purposes are considered. The results of studies of the influence of various parameters on the stability of the upper compressed sheathing of wood composite panels with bonded joints of sheathings and ribs (type of connections, coefficient of stiffness of the bonded joints, span size, width of panels and material of anisotropic sheathing) are presented. To implement the task, the Lekhnitsky theory of calculating the stability of anisotropic plates is used, in particular, the energy method for determining the critical force for a flat anisotropic plate loaded along the edges by tangential efforts. For describing the distribution function of tangential efforts on the edges of the sheathings, the Rzhanitsyn theory of calculating composite rods is applied. As a result of numerical studies, the coefficients of longitudinal bending, which can be used in the engineering calculation of wood composite panels with mechanical and glued joints are obtained.
Determination of stresses in truss rods: numerical and physical experiment
Authors: Kiychenko T S , Tabanyukhova M V , Kharinova N V 
Published: December 2019

Abstract
The paper presents the results of an experimental numerical study of the stress state of the rods of a flat truss. The values of internal forces and stresses in the truss model were obtained using the SCAD software package, as well as experimentally using the polarization-optical method. The finite element method (FEM) is used to calculate two plane truss models. In the first case, the truss was modeled by rod elements, in the second – by plates. The fields of normal, tangential and principal stresses are obtained. Based on them the longitudinal internal forces in the rods of the farm are determined. The captins of interference bands in the model of a flat truss are obtained by the method of photoelasticity. Stresses are calculated with their help. The quantitative and qualitative analysis of the stress state, described in the numerical and physical experiment, is carried out.
Use of monitoring system in Ekaterinburg
Authors: Avdonina L , Alekhin V , Shipulin E 
Published: December 2019

Abstract
The monitoring of buildings and structures condition, as well as the timely implementation of corrective actions aimed at the elimination of adverse factors, are the most important aspects that shall be addressed at the construction stage. The usage of monitoring systems makes it possible to monitor the building condition and above that to implement more efficient design solutions in the prospective projects using the results of the analysis of the acquired and design data. In this work the review of a monitoring system installed in a high-rise building located in Ekaterinburg is given. The paper describes the analysis of the natural oscillation frequency and the logarithmic decrement of fundamental tone acquired with the help of accelerometers, and compares the values with the acceptance limits. The process of converting data acquired by strain gauges for the determination of the stress-strain condition of the bearing structures is analysed. The process of comparison of data obtained by the monitoring system of a high-rise building is described. The necessity of the application of the monitoring system is analysed.
Phase composition of cement brick after different time of low temperature curing
Authors: Gnyrya A I , Abzaev Yu A , Korobkov S V 
Published: December 2019

Abstract
The paper presents a study of the quantitative phase composition of cement brick using the Rietveld method, after the different time of its isothermal hardening at 40 °C. With a high degree of reliability, it is established that Ca6H2O13Si3 and Ca3HO9Si3 are major phases of cement brick. The presence of hydrogen atoms is taken into account in the specified lattices. X-ray diffraction measurements and the mass fraction of these phases provide the theoretical calculations of their contribution to the integrated intensity. It is shown that the lattices of the studied phases are in a highly stable state, and their binding energy tends to increase with the increasing time of curing. One can observe spatial redistribution within the lattice stability and variation in the number of atoms in the unit cells. The lattice stability interval allows a certain spatial redistribution of Ca, H, O and Si atoms inside the lattices.
Designing of organizational and technological solutions for construction in constrained urban environments
Authors: Chebanova S A , Polyakov V G , Azarov A V 
Published: December 2019

Abstract
The article substantiates the need to improve the quality of design work on the construction site in the context of the existing urban development taking into account specific criteria and gradations. The features and problems of the main periods of construction are investigated. To improve the quality of the design documentation, in particular, of the construction work program in constrained urban conditions, the authors conducted the research of the influence of a complex of constraint factors affecting construction preparation activities. Recommendations of construction site organization in the current conditions are given. The results are presented and further research stages of technological processes in constrained urban conditions are outlined. We show the expediency of a systematic approach to improving the quality of construction’s process. We are taking into account the assessment of environment state and the need to reduce the negative impact of construction and assembly works on nearby already built-up areas. The need to take into account the above factors for developing a project of works execution is justified.
Innovative assembly line for building and major repair of main pipeline
Authors: Akhmedov A M 
Published: December 2019

Abstract
The article proposes an innovative assembly line for pipe sections under field conditions excluding pipe layers. With the suggested assembly line the alignment of pipe sections can be done for welding works. Apart from this, the proposed line can help in insulation works, support of pipeline section, and laying of the finished pipe section onto a special supports along the trench. can be performed. The assembly line is equipped with hoists enabling to lift pipe sections and finished strings without lifting facilities used in conventional technique which will considerably improve environmental situation and cut financial expenditures. The offered assembly line will considerably improve the equipment of the repair and construction site as well as improve the working conditions of the personnel. The assembly line is fully electrically powered which makes it ecologically friendly. An innovative assembly line is treated in the article that is adapted to operate on the construction site. The line was developed as multi-functional one. With the help of this proposed line, there is the opportunity to fully automatize erecting and sheathing and laying works. The application of special anchor-type supports will make it possible to provide a spatial stability while performing the jobs.
Features of estimation of intangible resources of investment and construction activity in cyclic dynamic
Authors: Peshkov A V 
Published: December 2019

Abstract
The current level of development of the economy of the Russian Federation and in particular the construction industry requires the development of a system of management of material and intangible resources. The article reveals the nature of intangible resources in the investment and construction sphere. It is proved that a large reserve for the growth of economic efficiency of investment and construction activities is the use of intangible resources. As a result of the analysis of the value and characteristics of intangible resources of investment and construction activity, the target orientation of their reproduction in the process of construction projects implementation is determined. A new trend in the development of investment and construction activities, which is to accelerate the rate of expanded reproduction of intangible resources of the activity. In the analysed construction industry the development of a system of management of material and intangible resources plays an important role in ensuring the effective development of the enterprise. The author substantiates the need for the use of intangible resources depending on the types and phase of the investment and construction process. Each type of intangible resources has a set of specific features characteristic of each phase of economic turnover. In the future, this study will be relevant for the development of proposals for the expanded reproduction of intangible resources.
Development of new tool joint for modular systems made of cellular polycarbonate
Authors: Abramyan S G , Polyakov V G , Grunin A V 
Published: December 2019

Abstract
The paper discusses the use of solid and structural polycarbonate modular systems in energy efficient facades and roofs of unique modern buildings. Inferior to nearly all translucent materials by light transmission, cellular polycarbonate sheets offer a combination of important consumer properties, such as impact resistance, light weight, flexibility and chemical stability. At the current stage of construction development featuring cellular polycarbonate modules, the assembly (installation) fails to meet the constructability and work safety requirements. To address these drawbacks of cellular polycarbonate structural modules, a new butt joint is suggested consisting of two separate C and T shaped profiles, where one joint profile is placed inside the other one’s cavity after their fastening to a cellular polycarbonate sheet. To build a variety of most complex curved enclosures, the coupling parts can be rounded similar to existing ready-to-use cellular polycarbonate sheets with U-joints. The paper outlines the installation of cellular polycarbonate modules with the new joint profiles. To improve the constructability of vertical translucent enclosures, modular systems can be enlarged on special benches and installed using vacuum lifting beams. The reliability and safety of the new structures is ensured by extensive profile resting upon metal or other load bearing supports.
Emergency ventilation industrial premises of chemical industry enterprises
Authors: Zherlykina M N , Kononova M S , Vorob’eva Y A 
Published: December 2019

AbstractThe results of the study concentration field of chemical harmful substances in the entire volume of the room during the operation of emergency ventilation with a given air exchange are proposed. Explosion safety of production rooms is provided on condition of 10 % of the lower limit of flame spread on gas-air mixes and observance of equality of concentrations of harmful substance in the working zone and in the leaving air. Emergency ventilation is proposed, which provides uniform removal of air from the entire volume of the room to exclude the formation of stagnant zones and ensure explosion safety in chemical emissions. Emergency ventilation with a natural flow of air through the holes with variable aerodynamic characteristics with a volume-oriented arrangement of supply and exhaust holes to ensure uniformity of the flow and removal of air from the entire volume of the production room.
To assessment of heat saving in automation of buildings heating systems
Authors: Panferov V.I. , Panferov S.V. 
Published: December 2019

Abstract
The paper considers the problem of estimating the magnitude of heat savings in the automation of building heating systems. Its authors propose a fairly simple method for determining the relative efficiency of the heat losses of a building in various temperature regimes. The plausibility of the savings data available in the literature is analyzed. The research provides approximate estimates of the savings for real situations. The practical value of combined heating systems using, in particular, renewable and non-traditional energy sources is estimated. It is indicated that the cost of heat to maintain a given temperature mode is determined by the physics of the heat exchange process of the building, so they are the same with any heating system. As a result, the combined system has no advantages over other types of heating systems in terms of heat consumption.