bluuebunny/crossref_metadata_2025_split huggingface dataset:
An investigation of the influence of the reduced elasticity modulus on strength of pultruded frp members in bending
Authors: Kuznetsov Ivan , Salakhutdinov Marat , Shakirzyanov Farid , Khaydarovand Lenar , Aripov Daler 
Published: August 2020

Abstract
The polymer composite known as Fibre Reinforced Polymer (FRP) has several advantages over conventional materials. It has been slowly incorporated into civil infrastructures, because the general regulations have not yet been officially introduced. Pultruded FRP manufactures have internal standards of organizations and Guidelines. Therefore, the design identifies issues that require clarification. This study presents influence of the reduced elasticity modulus on strength of pultruded FRP members in bending with a symmetrical cross-section. The position of the neutral line and calculation of strength and deflections with and without reduced modulus of elasticity are determined in the study. Comparison of the results of calculations showed that when taking into account the reduced modulus of elasticity, the deformability is reduced by up to 15 %. The significance of the results obtained for the construction industry consists in the possibility of a refined calculation of the flexural pultruded FRP members taking into account the reduced modulus of elasticity in order to effectively use the strength reserves and reducing material consumption.
Wind impact on low-rise buildings when placing high-rises into the existing development
Authors: Mironova Juliya 
Published: August 2020

Abstract
As height of new development rises, there is an increase in pressure from the windward side and in eddy flows from the leeward side of a high-rise building. This pressure affects not only neighboring high-rises, but also it has an impact on low-rise existing ones. The purpose of the study is to model wind flows to determine maximum aerodynamic wind effects on multi-storey buildings and their surroundings. It also aims at improving the expression for defining maximum wind load depending on the building height and the distance to it. In this study numerical experiments on modeling the distribution of wind flows in a virtual wind tunnel for an existing low-rise building have been carried out. Based on their results, an increasing coefficient in the expression for determining the wind load depending on the height of a multi-storey building and the distance to it is proposed. The results obtained can be used in determining wind loads during the reconstruction of low-rise buildings and their verification calculations when placing multi-storey and high-rise buildings in existing buildings.
Efforts redistribution in statically indeterminate bar systems based on scaffolding by force limiter
Authors: Lenar Khaidarov , Gennady Shmelev , Marat Salakhutdinov 
Published: August 2020

Abstract
Scaffolding structures are commonly statically indeterminate and therefore the load-bearing capacity of the elements is not fully used, and the load-bearing capacity of the structure is limited by the most loaded element. It is important to redistribute the forces in the structure elements to make the most efficient use of their load-bearing capacity. It is suggested to introduce force limiters into the most loaded elements that allow shifts inside the element when the force limit value is reached. Due to this displacement the forces inside the element are reduced and redistributed to the adjacent elements. A numerical analysis has been carried out on the example of wall construction to assess the impact of the force limiter on the load-bearing capacity of the structure. The article presents the design of a force limiter designed for vertical diagonal. Laboratory test of the force limiter as part of scaffolding assembly was carried out.
Stress-strain state of the connection node of translucent structures with the load-bearing frame of the facade system
Authors: Antonov Anatoliy , Shmelev Gennady , Khaidarov Lenar 
Published: August 2020

Abstract
The article presents the results of studying the stress-strain state of the elements of the connection node of translucent modules with a load-bearing frame as part of a standard post-and-crossbar facade system. The research is aimed at studying the initial stresses and deformations of the system node elements in its design position without applying external loads. At the initial stage, experimental studies were conducted to determine the elastic modulus of rubber inserts, which are the main elements that transmit forces from translucent modules to the supporting frame of the system. Based on the results of the tests, an approximated graph of the dependence of stresses on deformations of rubber inserts was obtained, which was exported to the software package, for modeling their actual work when calculating by finite element methods. At the stage of numerical studies geometrically and physically nonlinear problems of contact interaction of elements were solved, the resulting picture of the stress-strain state of the node in position before the application of loads and impacts was created, the value of compression of the external pressure profile to the load-bearing frame was set.
Subgrade vertical deformations of a building in the zone of a deep pit influence
Authors: Mirsayapov Ilizar T , Aysin Niyaz N 
Published: August 2020

Abstract
The existing methods for calculating the settlements of the foundations of buildings are developed for the soil mass without defects and damage. It is also assumed that the physical and mechanical characteristics of the soil are constant throughout the life cycle of buildings and structures. But the mechanical characteristics of subgrade soils are unstable and continuously change under the influence of various factors. The use of existing methods of calculation leads to inadequate settlement estimates of the subgrade and foundations of buildings and structures. In this regard, this work has developed a method for calculating the settlements of bases and foundations of buildings, taking into account the formation and development of defects and damages in the soil structure in the zone of influence of a deep pit. This method allows you to take into account the influence of factors such as dilation, formation and development of cracks, hardening, changes in the friction angle, shear modulus and deformation modulus. The developed method was tested on a real reconstructed object. Geotechnical monitoring for one year confirmed the results of calculations using the proposed methodology.
Modified trilinear stress-strain diagram of concrete designed for calculation of beams with fiberglass rebar
Authors: Mirsayapov Ilshat , Apkhadze George 
Published: August 2020

Abstract
An improved technique for determining the strength of reinforced beams with polymer composite reinforcement based on a nonlinear deformation model using a three-line diagram of concrete deformation under uniaxial compression with an elastic, elastic-plastic zone and a concrete softening zone is considered and proposed. The features of the strength analysis of beams with fiberglass reinforcement are revealed. The calculation method presented in this article allows us to minimize the use of empirical coefficients to determine the height of the compressed zone of concrete and at the same time does not lead to labor-intensive calculated dependencies. The method is based on the use of the Euler – Bernoulli beam theory and the use of physical stress-strain relations for concrete. This calculation method allows you to set accurately the height of the compressed zone of concrete, and accordingly the strength of the beam elements in the normal section. Good results of comparison with experimental data were obtained.
Cement stone, modified by galvanic sludge
Authors: Stepanov Sergei , Krasinikova Natalya , Makarov Dmitry 
Published: August 2020

Abstract
The relevance of the research topic stems from the use of multi-tonnage industrial waste in cement systems. One such waste is the sludge resulted from electroplating aluminum alloy products. Galvanic (electroplating) sludge is pasty and unstable in moisture. For this purpose, it was previously dried and then grinded so it could be rationally used. Impact of sludge on technological properties of cement stone and strength properties of cement stone were studied according to standard normative methods. It is shown that galvanic sludge increases the water demand of cement paste. Therefore, the joint effect of naphthalene formaldehyde and polyester carboxylate-based sludges with plasticizing added was studied. Their efficiency depends on the way they are produced. The mixed use of galvanic sludge with plasticizing additives reduces the water-cement ratio by 20-40 %, increases the strength of cement stone within the early hardening time by 3 times and in 2 times in the grade age. The phase composition of the modified cement stone was studied using defective thermal analysis. It was established that using galvanic sludge together with plasticizing additives decreases portlandite.
The article can be useful for those recycling the waste in question.
Composite gypsum binder under introducing thermally activated clay as a pozzolanic component and adding ground limestone
Authors: Khaliullin Marat , Dimieva Alsu 
Published: August 2020

Abstract
The purpose of this article is to study the effect of ground limestone additives on the basic physical and mechanical properties of the composite gypsum binder. It includes portland cement and pozzolanic additive of thermally activated clay as hydraulic components to reduce the consumption of more expensive calcining components of the binder. Using standard methods of research building materials we have obtained dependencies that characterize the effect of adding ground limestone on the water demand of the composite gypsum binder, its density, strength, water absorption, and water resistance of artificial stone based on it. It was established that the introduction of limestone into the composite gypsum binder composition with specific surfaces 500-800 m2/kg in an amount of up to 5-10 % by weight causes an increase in compressive strength by 15 % compared to control samples. When introducing up to 10-15 % by weight of limestone with a dispersion of 300 and 500-800 m2/kg, respectively, the strength remains at the level of additive-free samples with the preservation of the softening coefficient corresponding to water-resistant binders.
Heavyweight Concrete Based on Hydromechanochemically Activated Binder
Authors: Pimenov Sergey 
Published: August 2020

Abstract
The results of the influence hydromechanochemical activation of the cement with superplasticizing admixtures, both individually and jointly, on the structure formation of cement stone, the physical and technical properties of heavyweight concrete. An analysis of the microstructure and chemical elements in the spectrum of the surface of a cement stone prepared with preliminary hydromechanochemical activation of the binder with superplasticizing admixtures is presented. The method of hydromechanochemical activation of cement with a superplasticizing admixtures can be recommended for the production of quick-hardening concrete and mortars. The production of quick-hardening concrete is especially important: monolithic concreting in winter, when it is necessary to gain critical strength in concrete in a short time; precast concrete production at precast concrete plants, where it is possible to reduce energy costs for steaming products; modern additive printing technologies using a 3D building printer, requiring the development of new effective quick-hardening mortars and concrete.
Cement stone, modified by chemical water treatment sludge
Authors: Krasinikova Natalya , Stepanov Sergei , Makarov Dmitry 
Published: August 2020

Abstract
Chemical treatment of municipal and industrial wastewater is becoming increasingly common in the world, resulting in sludge formation. But only a small fraction of the waste is disposed of. Therefore, the issue of the potential use of these wastes in making construction materials is vital.
This paper examines the possible use of multi-tonnage industrial waste, in particular, sludge of chemical water treatment (SHVO) produced by combined heat and power plants in cement systems. Sludge of chemical water treatment is a pasty mass unstable in moisture. For this purpose it is advisable to pre-dry this waste until it becomes a fixed-mass, and then grind it. The impact of SHVO on the technological properties of cement paste and strength properties of cement stone was studied. The article shows that the introduction of SHVO into cement paste increases its water demand. The joint effect of naphthalene formaldehyde and polyester carboxylate-based sludge with additives was studied. Their efficiency depends on the way they are produced. The use of sludge with superplasticizers reduces binding agent consumption by 7.5% without loss of strength properties and reduces porosity of cement stone.
It was established that the introduction of SHVO into cement systems changes the physiography of newgrowths.
Guaranteed management of the prevention, detection, and proof of offenses in socio-technical construction using a geoinformation system
Authors: Mironov Aleksey , Mironova Anna , Burlov Vyacheslav 
Published: August 2020

Abstract
In the conditions of narrow departmental management, the administrative practice integrity in socio-technical construction is being destroyed by a lack of completeness and authenticity of administrative offense proceedings within a reasonable time. The timely application of the geoinformation system in order to prompt prevention, reliable revealing and proper proving of offenses ensures a preventively guaranteed efficiency and security of socio-technical construction. This paper proposed a synthesis of the administrative practice management model in construction, based on the natural-scientific approach to the adoption of managerial decisions. The condition for the existence of guaranteed management, which relates the characteristics of processes and performance indicators, is concretized by the Kolmogorov-Chapman equations system. Network models of interacting processes of the revealing and proving of offenses, the origin and identification of violations, their neutralization through the managerial impact on the limited resources of administrative practice in construction and of geoinformation system are built. Based on the simulation results, the requirements for the geoinformation system that ensure guaranteed management and maximum security to the socio-technical construction within a reasonable time are determined.
Classification of construction work types considered with worn of main production assets
Authors: Ludmila Kokliugina , Alexei Kokliugin , Ruslan Ibragimov 
Published: August 2020

Abstract
The main results of the research consist in comparing the terms of construction work during the period of reconstruction or major overhaul in various normative documents and generalization to single result. Methods are proposed for resolving contentious issues, avoiding unnecessary costs and appealing to arbitration courts.
It is established that in recent years, the methods of organization and construction management have undergone significant changes.
It was revealed that normative documents of various institutions allow different interpretations of terms and concepts, which lead to controversial situations related to the classification of these works by tax authorities. The given problems arise at the stage of completion of construction work, when the adjustment in the design and contract documentation is practically impossible to execute.
An example of construction and installation works implementation during the overhaul of an industrial building is considered and analyzed. Discrepancies in terms are revealed in terms of performance of construction work during the reconstruction or overhaul period.
Cold water concreting technology using thermoactive formwork
Authors: Imaykin Dmitriy , Ibragimov Ruslan 
Published: August 2020

Abstract
The paper presents the study results of temperature and strength indices of structures while performing isothermal warming in thermoactive formwork. The effectiveness analysis of thermoactive formwork panels warming in the freezer with complex additive was also carried out. Thermoactive formwork is a box-shaped structure consisting of 20 mm thick panels of laminated plywood with built-in wires. The total size of the thermoactive formwork for concrete construction was 200×200×200 mm. Concrete mixture was laid in thermoactive formwork in layers and caked by rodding. Then concrete mixture was warmed up using heating wires. Samples were placed in the freezer at a temperature of 18 °C for 1, 3, 7, 28 days. However, the samples were kept in a positive temperature of about 16 °C during the first ten hours while the concrete mixture was stored in the freezer.
According to the experiment results it was established that the lowest temperature was in the center of a formwork, which proved that this formwork could be used at an ambient negative temperature. It was revealed that heavy weight concrete with complex additive had a compressive strength higher by 57 compared to the control sample.
Modeling the process of biodeterioration of cement compositions
Authors: Shakirzyanov Farid , Shakirzyanov Rashit , Kayumov Rashit , Stroganov Viktor , Sagadeev Evgeny 
Published: August 2020

Abstract
The paper studies the problem of developing the theoretical foundations of the processes of diffusion biodegradation of mineral building materials (cement composites) under the action of aggressive microorganism vital products. The impact of the aggressive environment of microorganisms on the material is taken into account on the basis of Fick’s 2nd law. The resulting equation is solved by the finite difference method. Some experimental and theoretical studies of influence of the aggressive environment of microorganisms on the strength characteristics of the samples of cement composites have been carried out. The mathematical regularities of influence of the exposure time to the aggressive environment of microorganisms and the diffusion coefficient on the strength characteristics of composites have been established.
Construction technology of fixed formwork and quality control
Authors: Evstigneeva Yuliya , Ibragimov Ruslan 
Published: August 2020

Abstract
The main results of the research are to find numerical solutions for selecting effective fixed formwork material for columns and analysis of technological operations. The use of fixed formwork of glass-magnesite sheet allows improving quality and stability of the structure, increase fire resistance, which helps to extend the life of the concrete structure.
Based on numerical and experimental studies, a model of the formwork fastener for a round column of 3 m high, with a diameter 500 mm was developed. A calculation model was created and the design of the formwork made of glass-magnesite sheet was calculated. So, for the diameter of the concrete column from 300 to 600 mm, the thickness of the glass-magnesite sheet varies in the range: 7-23 mm.
A workflow has been developed for the installation of fixed formwork and for concreting columns with the determination of the required amount and type of work, with the determination of the complexity; a workflow for the quality control of work has also been developed. Such periods as: accepting of elements of fixed formwork, installation of fixed formwork elements, accepting of timbering construction operations must be monitored.
Reprofiling of objects with monolithic reinforced concrete frame
Authors: Topchiy Dmitriy , Bolotova Alina , Vorobev Aleksey , Atamanenko Alevtina 
Published: August 2020

Abstract
The actual issues of improving the quality of the organization of production processes in the monolithic construction. The efficiency of the construction production is significantly affected by organizational and technological reliability. The main factors affecting the rate of organizational and technological reliability of monolithic construction. This index takes into account the statistical characteristics of efficiency and organizational risks that arise in the process of functioning of objects of monolithic construction. Revealed and substantiated the necessity of development of recommendations and methods that will allow assessment of the overall organizational and technological reliability of monolithic construction and make a rational decision on the adequacy of the selected preventive measures with correction of the calendar plan of construction in terms of technical risk. Study and analysis of functional efficiency of monolithic construction operations suggest that faulty organization of production processes creates the risk of noncompletion of a construction stage as scheduled, deterioration of the quality of works, and, consequently, a reduced structural reliability of the monolithic construction project.
Technology for reinforcing strip foundations of reconstructed brick buildings based on computer modeling
Authors: Galiev Ilyas , Ibragimov Ruslan , Ashrapov Azat , Radaykin Oleg 
Published: August 2020

Abstract
When resolving the issue of the foundations strengthening and reconstructed buildings foundations, it is necessary to consider the ground part of the building or structure as a whole. The foundations are the soil foundation under them. It is necessary to solve simultaneously the problem of reducing the sensitivity of a building or structure to uniform precipitation of foundations and to restore the spatial rigidity of the building.
In order to study this issue, a numerical experiment was developed-modeling and calculation of the reconstructed brick building bearing capacity based on varying the thickness of the brick wall.
The analysis of stress-deformed state portion of the structure revealed that the greatest deformation of the elements is obtained in the overlapping area bearing elements and the edge beam in the location area. The relative displacements study of the finite elements nodes showed convergence with field observations of the foundation beam deformation at the object.
Buildings energy consumption modeling methods
Authors: Aimagambetova Zaure , Bektemyssova Gulnara , Ibraeva Zhanar 
Published: August 2020

Abstract
The tasks of improving energy efficiency are one of the main parts of the project in the process of its implementation. The present paper discusses methods of mathematical modeling of heat transferring processes taking into account climatic factors of the city of Turkestan of the Republic of Kazakhstan. Using a one-dimensional model of the equations of heat conduction, a nonlinear equation is compiled regarding the temperature of the material on an open surface. Methods for solving the nonlinear equation are applied, numerical calculations are carried out. The accuracy of the obtained mathematical methods should increase with the use of computer modeling and the improvement of mathematical devices of calculations, which requires further study of the obtained calculations. The results of numerical calculations are presented in graphical form. The analysis of various modeling methods helps in choosing the right solutions for a particular case. Nowadays, environmental problems, climate change, more than ever, require modern tools and technologies to improve the energy efficiency of buildings, such as energy modeling, mathematical modeling of the microclimate.