bluuebunny/crossref_metadata_2025 huggingface dataset:
Reliability assessment of Buckling Strength for Battened Built-up Columns steel considering shear deformations
Authors: Tran Ngoc-Long , Nguyen Trong-Ha , Phan Van-Phuc
Published: July 2020

Battened built-up columns are widely used in steel construction especially when the effective lengths are great and the compression forces light. The buckling strength of this structure depends hugely on the material properties, geometry dimensions and also the flexural deformations both of the chords so the battens must be considered in order to derive the shear stiffness. The input parameters are potentially random sources. This research presents an assessment of the safety for Buckling Strength for Battened Built-up Columns steel considering shear deformations. Reliability of the structure is evaluated using Monte Carlo simulation method. Effects of input parameters are also investigated.
Granular material pressure to reinforced concrete walls of cylindrical slender silos: Analysis and Experimental studies according to Eurocodes
Authors: Tuan Trung Nguyen , Truong Thang Nguyen , Tung Vo Manh
Published: July 2020

Silos act as storage structures used for containing granular materials. The solids-induced loads acting on the walls and internals of silos are not easily determined, and inconsistent between commonly used design codes. This paper presents principles and a brief description of Eurocode standard to determine the solids-induced loads acting on reinforced concrete (RC) walls of cylindrical slender silos. That code is being considered as the most complete and modern standard for silo design up to now. A calculation example is provided to clarify the procedure. An experimental program was conducted to determine the friction coefficients between some granular materials and RC walls. The experimental results show that the values introduced in Eurocode can be used reliably.
Nonlinear integro-differential equations of bending of physically nonlinear viscoelastic plates
Authors: Indiaminov Ravshan , Butaev Ruslan , Isayev Nurbek , Ismayilov Kubaymurat , Yuldoshev Bakhtiyor , Numonov Akhrorbek
Published: July 2020

An important feature of real materials is the nonlinear nature of the relationship between stress and strain. Taking into account such features of deformation of structural materials in the calculation allows us to bring theoretical forecasts closer to their real behavior. Physical nonlinearity is due to the calculation in the calculation of the nonlinear dependence between the components of the generalized stresses and strains characterizes the work of the structural material in the elastoplastic region. Many structural elements of modern technology are made in the form of plates of various shapes. The widespread use of plates is explained by their high strength, considerable rigidity and relatively low weight, which, along with the manufacturability of manufacturing, distinguishes them among other structural elements. A constant trend in the development of technology is an increase in the intensity of dynamic effects, accompanied by an increase in the level of vibration.
Stress-strain state of expansive soils when soaking from above
Authors: Yarkin Viktor , Lobacheva Nataliia
Published: July 2020

The article proposes a method for determining additional vertical stresses at any point in the massive of expansive soil, which arise from the weight of unmoistened soil outside the soaking area. A comparison of the results of research stress-strain state of expansive soils when soaking from above, obtained by the proposed method, the finite element method and in accordance with current regulatory documents. The proposed regularity of the distribution of additional stresses from the weight of unmoistened soil outside the soaking area in horizontal sections of the flooded zone is confirmed by the results of numerical studies by the finite element method. For a vertical line passing through the center of the flooded zone, the proposed method gives results that are almost identical to the current regulatory documents. The application of this method allows more accurate determination of the swelling surface, taking into account the unevenness of the geological structure, the shape of the flooded zone and stress fields, and determining the forced displacements of the base or equivalent loads when calculating structures interacting with expansive soil. The conditions are determined under which it is advisable to simulate the impact on the building from the side of swelling soil by equivalent loads acting from the base.
Numerical investigation of the aerodynamic coefficients for the steelmaking shop
Authors: Tusnina Olga , Kolyago Alexey
Published: July 2020

The wind load on the building depends on its shape and size, type of terrain, climatic region and a number of other factors. In accordance with Russian standards for buildings with a high level of responsibility, it is required to determine the wind load either experimentally in a wind tunnel, or using numerical simulation by solving three-dimensional problems of fluid dynamics. The article presents the results of the numerical determination of aerodynamic coefficients for the building of the steelmaking shop, made using the Abaqus software package. The steelmaking shop has a complex shape in plan and uneven in height, it is a particularly dangerous production facility and refers to structures with a high level of responsibility. The aerodynamic coefficients on the walls and roof of the steelmaking shop obtained by CFD analysis are represented. The different meshes are analyzed. Regulatory method to calculate aerodynamics coefficient also may be adopted for this building. The values of the coefficients by regulatory procedure are on average greater than those numerically obtained. The wind load does not have a significant effect on the framework of the steelmaking shop, since the efforts from the wind load are not more than 10% of the maximum total effort in the elements, while the efforts from the crane load are up to 45% of the total effort, and from the technological loads up to 50% of the total effort. So, using the regulatory procedure for bearing capacity analysis of framework of the steelmaking shop is also possible.
A simplified approach in determining the c and φ for asphalt mixtures
Authors: Van Phuc Le  , Hung Nguyen Van , Phuc Nguyen Quang
Published: July 2020

In this study, using the Mohr-Coulomb failure theory, a simplified method was proposed to determine the cohesion (c) and internal friction angle (φ) for asphalt mixtures based on direct tension (DT) strength and indirect tension (IDT) strength or unconfined compressive strength (UCS) and IDT strength. The direct tension (DT) strength, superpave indirect tension (IDT) strength and unconfined compressive strength (UCS) were conducted to verify this method using three asphalt mixtures. It was found that the determination of c and φ values have mean absolute errors of 5.2% and 1.8%, respectively in comparing two methods indicating that the c and φ can be estimated from DT strength and IDT strength or IDT strength and UCS. Further study is recommended to verify using different binder grades and mixture types.
Mathematical Model of Mass Transfer Processes in Biological Corrosion of Cement Concretes
Authors: Fedosov Sergey , Rumyantseva Varvara , Konovalova Viktoriya , Loginova Svetlana
Published: July 2020

Timely protection of underwater concrete and reinforced concrete objects from biofouling will significantly reduce the economic damage from the effects of corrosion damage, improve the reliability of structures operated in high humidity conditions, and reduce the likelihood of accidents. Despite the abundance of ways to protect against fouling, there are still no radical methods of struggle. It is expedient to find a solution to the problem of predicting the durability of concrete and reinforced concrete structures in biologically aggressive liquid media from the point of view of the theory of mass transfer. The model of mass transfer in an unlimited two-layer plate is considered for the first time in the form of a system of partial differential equations of parabolic type with boundary conditions of the second kind at the interface between concrete and liquid and the fourth kind at the interface between concrete and biofilm, which describes diffusion processes in the system of «cement concrete – biofilm – liquid». The proposed physical and mathematical model takes into account the properties of the solid and liquid phases, as well as the kinetics of growth, reproduction and death of microorganisms. The results of calculating dimensionless concentrations of «free» calcium hydroxide over the thickness of the concrete structure and biofilm are presented. The application of the obtained solutions will allow timely monitoring of the biocorrosion destruction of underwater structures and select effective protection methods.
Penalty function method for imposing nonlinear multi freedom and multi node constraints in finite element analysis of frame systems
Authors: Bich Quyen Vu Thi , Ngoc Tien Dao , Nhu Dung Nguyen , Quoc Khanh Cao
Published: July 2020

This paper focuses on the treatment of nonlinear multi-freedom and multi-point boundary condition in finite element analysis of frame systems. The treatment of boundary constraints is required to produce modified system of equations based on master stiffness equations considering nonlinear constraints. For imposing nonlinear multi freedom and multi point constraints, the Penalty Augmentation method and Lagrange Multiplier Adjunction method are better in many applications. In present paper, the Penalty Augmentation method is using for implementation of nonlinear boundary constraints. The nonlinear relationship considerably increases the difficulty in constructing and solving the modified system of equations. The Newton Raphson method, have been the most powerful and popular method for solution of nonlinear equations, is used for solving studied problem. Using the Newton Raphson technique, this paper develops the incremental-iterative algorithm to solve the nonlinear modified system of equations. Based on the presented algorithm, the paper proposed calculation procedure and established programs for determining internal forces and displacements of frames having nonlinear multi freedom and multi point constrains boundary. The numerical test results using the proposed method show the efficiency and reliability of proposed algorithm.
Joint work of layers of different strengths in reinforced concrete multi-layered construction at compression
Authors: Berlinov Mikhail , Berlinova Marina
Published: July 2020

Currently, a lot of attention in the construction industry is given to the issues of ensuring the reliability of reinforced concrete structures at all stages, both manufacturing, design and operation. In this regard, this article conducted a study of the reliability and durability of multi-layered structures with a monolithic connection of layers in order to reduce the own weight of such elements and the cost of construction and repair. The method of determining the average strength in the section of the element is presented, which allows the forecast of the durability of multi-layered reinforced concrete structures and allows to determine the overall work of each component, regardless of their number and the moment connection time, as well as defects in the manufacture and damage caused during operation, various physical-mechanical and reological characteristics of materials of layers of multi-layered structure, actual tense-deformed multi-layered parts as they work together. The presented method of calculation is based on the fundamental dependence of stresses and deformations in concrete, applied to a compressed multi-layered element.
Impact of the idle run of a rotating easily dumped structure on pressure in the room
Authors: Gorev V A , Korolchenko Anton
Published: July 2020

The work addresses the alternative use of window sashes as an easily dumped structure (EDS) with window casement rotation to ensure gas release from the room and pressure venting. The paper focuses on the use of the option with one outside rotating casement as EDS while the other part of the window sash can be opened inside or be immobile. The work records equations for the movement of a swivelling safety structure and changes in pressure in a dimensionless form with identified dimensionless complexes, which equivalence ensures the likeness of aperture opening. The study is limited to the idle run period. It was demonstrated that with small room volumes, the idle run must be taken into account and its impact on a pressure growth must be reduced. The work shows ways to reduce the idle run time.
Silos and warehouses complexes in five locations in Tanzania – case studies
Authors: Maria Kulczycki Paweł
Published: July 2020

In the end of 2016 National Food Reserve Agency of Tanzania (NFRA) ordered from Polish company FEERUM S.A. implementation of grain silo projects, production of designed silos, ensuring their transport to Tanzania, assembly and commissioning. Structure design of silo complexes was ordered from the design office, the subcontractor – TEK Projekt. The paper describes various aspects of data acquisition, design and execution of foundation works from the point of view of Central European contractor in Africa. In general it ends up with a kind of wake-up call to open designers eyes for situation of different countries and people, improving general knowledge about world problems.
Computer simulation of fracture dynamics in a fiber-reinforced composite
Authors: Abdukadirov Sagdulla , Buriev Abdulaziz , Ayzenberg-Stepanenko Mark
Published: July 2020

Calculation models are developed to examine dynamic stress concentration and fracture in a plane elastic fiber-reinforced composite sheet. The sheet consists of a regular system of alternating extensible fibers and pliable adhesive layers. In calculations, special algorithms are built preventing or minimizing parasite distortions caused by the mesh dispersion. Two engineering models of the adhesive are considered: (i) inertionless bonds of constant stiffness, and (ii) an inertial medium perceived shear stresses. Clarified solutions of the problem are obtained in the case that the sheet pre-stretched along fibers.
Behaviour and Calculation of Polymer Pipelines Under Real Earthquake Records
Authors: Nishonov Nematilla , Bekmirzaev Diyorbek , An Ekatirina , Urazmukhamedova Ziyoda , Turajonov Kodirjon
Published: July 2020

The effect of real records of several earthquakes on polymer pipeline vibrations are studied and analyzed in the paper. Longitudinal vibrations of straight end section of the underground pipeline are considered using the Kelvin-Voigt model. To solve the equation, the method of finite differences of the second order of accuracy is used. An algorithm has been compiled and on its basis a software product has been developed for the numerical calculation of an underground polymer pipeline under the effect of real seismograms recorded in different cities of the world. The stress-strain state (SSS) of polymer pipelines is determined under various boundary conditions.
The dynamic effect in a structural adjustment of reinforced concrete structural system
Authors: Fedorova Nataliya , Kolchunov Vitaliy , Tuyen Vu Ngoc , Dinh Quoc Phan , Medyankin Mihail
Published: July 2020

Results of experimental and theoretical studies of the dynamic effect of reinforced concrete structural system of building in case of its sudden structural adjustment caused by special accident action in the form of hypothetical removal of one of bearing structures are given. A zone of possible local failure of the structural system is modeled by a fragment of the structural system adjacent to that zone. For such a fragment called a substructure, an analytical solution of the problem for determining the time of dynamic loading of fragment elements is obtained. Evaluation of theoretical solution for determination of dynamic parameters of frame structural system at the considered action is performed by comparison of theoretical results with data of experimental studies of the fragment of a reinforced concrete multistory frame.
Rigid inclusion ground improvements as an alternative to pile foundation
Authors: Polańska Bernadetta , Rainer Jakub
Published: July 2020

The new buildings are very often planted in places where the soil is weak or unbearable. Their occurrence eliminates the possibility of shallow foundation. In such cases, it is necessary to make the ground stronger or to make a deep foundation. The paper presents a comparison of the method of the soil reinforcement with rigid concrete columns and deep foundation on piles. Features that combine both methods are presented, as well as advantages and disadvantages of both methods. The next part of the paper describes the basic calculation methods of the subsoil reinforcement with concrete columns. The work is finished with a case study describing an object located in southern Poland, where originally designed foundation piles in CFA technology were replaced by rigid columns made in the same technology.
Optimization of the duration of the pioneer construction period
Authors: Oleinik Pavel , Kuzmina Tatyana , Zueva Diana , Balmashnova Mariya
Published: July 2020

The construction of facilities in hard-to-reach and underdeveloped areas is an extremely difficult task, the solution of which largely depends on the quality and timely development of the construction area. Significant reserves for reducing the territories pioneer duration are in the combination of the pioneer construction and preparatory periods. To this end, on the basis of a generalization of practical experience, a methodology for linking work is proposed, based on the found equations of communication between the scope of work, the intensity of consumption of labor and technical resources, and the duration of work. The options for changing the scope of work: from the minimum size of the work area per team to the full work area for the whole process are examined and the conditions for rational combination of the pioneer construction and preparatory periods are disclosed.
Resource provision of the capital construction facility reengineering
Authors: Sborshchikov Sergei , Lazareva Natalia
Published: July 2020

The article is devoted to the identification of the need in material, technical, labor, information resources at the stages of life, their effective use as a part of the capital construction reengineering. In this regard, the issues of the formation of resource provision of the capital construction facility reengineering indicators, their documentary presentation, the stages of this business, the distribution of the resource provision functions between the investment-construction participants are established. The relevance and adequacy of the connection between resource supply structure and composition and current construction standards are shown. The basic theoretical aspects of the presentation of the resource provision of the capital construction facility reengineering as aggregate investment flows are stated. The efficiency of the resource supply of the capital construction facility reengineering is established to be connected with the solution of three main tasks: optimizing the composition and structure of resource provision, rational allocation of resources and works, quality assurance. The result of solving the problems may be: a decrease in the cost and duration of reengineering, an increase in the quality of capital construction object. An integrated solution to these problems may lead to a synergistic and multiplicative effect. The close correlation between the reengineering resource supply, scientific and technological progress achievements and development of the construction standards and information management and analysis systems is summarized.
The place of virtual structures in design of engineer process
Authors: Slavina Anastasiia , Tereshenko Diana , Fomina Anastasiia , Rukosueva Ekaterina
Published: July 2020

In this article the content and essence of the remote work in design of engineer processes is discussed. Design is one of the key stages of life cycle of construction, so it defines the most important parameters of personnel work. Virtual structures in project production have the role of structural units formed by the developed methods, which strive to complete the maximum number of qualitative projects in the shortest time. This method contributes to the empowerment of all independent members, united by a single goal in a working group, what improves the result and quality of the final product. Such progress is due to the improvement of working conditions, because with the creation of virtual structures, it became possible to perform assigned tasks outside the workplace.
Algorithm for the development project’s technology portfolio formation
Authors: Borozdina Svetlana , Dement’eva Anastasiya
Published: July 2020

The article presents the results of a study on the portfolio of technologies formation upon implementation commercial real estate projects. The aim of the study was to investigate the strategies and optimization of forming technology portfolio at the pre-investment stage. The relevance of the article the problems that arise in the interaction of the project organization and the developer. The article proposes a methodology for portfolio formation based on the use of multifactorial space. As a key indicator of decision-making, a priority coefficient has been developed. An algorithm for the formation of a technology portfolio during the implementation of a project at a conceptual stage has been developed; testing was carried out on the example of facade system solutions. The proposed algorithm can complement the existing quality control systems for the stages of design, construction and operation of an investment construction project.
Practical Health and Safety Road Map of Global Coalition as a Main Policy for Reduction of Accident Rate in Construction Industry of Uzbekistan
Authors: Sultanov Takhirjon , Nurimbetov Ravshan , Zikriyoev Aziz , Zokirova Nilufar
Published: July 2020

Modern construction industry still remains high risky economic sector in the world. Human factor mainly conceded working at hazardous conditions which caused various disease and accidents. But age of modern science and technology it is proved globally can be solve in effective way. Main purpose of the article is clarifying international health and safety practice standards and its prospective effects and implementation in Uzbekistan construction industry. Main outcomes of the paper work can be presented as best solution for creating safety climate and environment in building industry and increasing professional management system for developing human factor in Uzbekistan. As a conclusion international cooperation on development program on safety regulation and enforcement is directed increasing on social and economic effectiveness of construction industry.
Evaluation of investment efficiency in cyber-physical systems and technologies in the construction industry
Authors: Bilenko Pavel , Artamonova Iuliia , Kolesnichenko Alexey , Osipov Daniil
Published: July 2020

Currently, cyber-physical systems and technologies are being actively implemented in the international practice of developing technology companies. The theory and methodology of their implementation are devoted to the works of various scientists who have studied both the technical and economic problems of their implementation. The article focuses on the issues of economic evaluation of the effectiveness of investments in cyber-physical systems. A system of economic indicators for evaluation has been formed, these indicators are gathered into five groups for analysis. The costs of their implementation are structured in six groups and become the basis for the development of a performance evaluation calculator. Also, an assessment of the risks was made, these risks affect the results obtained from the technology implementation. Five organizational steps are proposed for the digital development of an industrial company, which have become the basis for determining its digital maturity. The proposed methods can be used in the implementation of cyber-physical technologies in production of building materials
Integrated project program management in the nuclear-power engineering as a driver for the interindustrial development of export-based contractors of the Russian Federation
Authors: Voronkov Ivan , Muñoz Catalina
Published: July 2020

Modern approaches to implementation of nuclear power plant construction projects all over the world are based on a symbiosis of project and process-based management, which are transformed within the conditions of information economy into integrated management that increases the efficiency of the project by combining capabilities and interests of all participants in the investment cycle. In the world market of nuclear power plant construction leading positions of the State Atomic Energy Corporation «Rosatom» create an environment for a highly efficient technology transfer, and also determine fundamentally new opportunities that offered for all high-tech domestic companies. It should be noted that in the context of globalization, participants number limitation of nuclear power plant construction projects’ integrated project management exclusively by structures of the owner, designer and contractor, which often included in «Rosatom» State Corporation, transforms project into an isolated system that does not have the potential for strategic interindustrial development. Under present circumstances, it seems appropriate to consider the process of managing a projects program in the field of nuclear power plant construction, which allows synchronizing strategic activities of domestic high-tech export-based contractors in order to achieve a common synergistic effect and ensure high economic competitiveness and technological leadership of each participant.
Modern methods of increasing the level of resource saving in construction
Authors: Aleksanin Aleksandr
Published: July 2020

The problem of increasing the level of resource saving and reducing the formation of the amount of construction waste is relevant in the construction of any buildings and structures. The solution to this problem will improve the quality of construction and installation work, reduce the time and cost of construction of facilities, as well as reduce the impact on the natural environment. It is possible to reduce the volume of construction waste generation during the construction of buildings and structures at the stage of development of project documentation, since one of the reasons for the generation of construction waste at the construction site is poor design documentation. The article identifies and analyzes the reasons for increasing the amount of generated building waste and reducing the level of resource conservation at the stages of both the development of design documentation and the implementation of construction and installation works. To solve this problem, it is proposed to use information modeling of buildings and structures, mobile information devices, robots and unmanned vehicles to control the work.
Capital construction projects management based on Bayesian networks integrated into the complexity model
Authors: Panteleeva Margarita
Published: July 2020

This article presents the author’s results of the developments to assess the likelihood of problems when managing capital construction projects based on Bayesian networks. The research aim was to study the management decision-making procedure in framework the implementation of investment and construction projects, as complex models. The article relevance arises in connection with an increase in the percentage of capital projects that have not been fully implemented. As a rule, the main reasons for canceling or suspending construction projects are the lack of constant investment, delays in preparing design estimates, problems with connecting ready-to-use facilities to engineering systems, and the lack of a clear technology for developing and monitoring contracts. The article proposes an approach for occurrence probability predicting of problem situations in the framework of capital construction projects, based on the integration of the project complexity model and the method for assessing problem areas using Bayesian networks. The developed approach for analyzing the future project state on the basis available statistical data on analog facilities was tested on the example of construction a hotel chain.
Modern approaches to assessing the efficiency of urban development projects in the context of the formation of a comfortable urban environment
Authors: Bovsunovskaya Maria
Published: July 2020

Nowadays, authorities at various levels, urban planners, architects, residents are rethinking and forming new approaches to urban planning in the context of sustainable development and the pursuit of a high-quality urban environment. The paper discusses the main methodological approaches to assessing the efficiency of urban development projects at the present stage. Attention is paid to the documents of strategic and territorial planning, methodological documents in the field of urban development assessment in the context of creating a comfortable urban environment, the main technical and economic indicators for substantiating urban development projects are given. The efficiency of urban development projects in the context of the formation of a comfortable urban environment is proposed to be considered in three areas: commercial, budgetary and socio-economic. The paper systematizes the characteristics of the types of efficiency and their criteria, provides formulas for calculating the indicators of commercial efficiency (income and expenses), the composition of costs and revenues of budgetary efficiency, describes the social effects in the implementation of urban development projects.
Ensuring financial statement accuracy through adjusting the value of reserves in construction organizations
Authors: Zaslavskaya Irina
Published: July 2020

This paper substantiates the need to create reserves for reducing the value of material assets in construction organizations in order to comply with the requirements for the reliability of financial statements. The issue of creating reserves is considered from the standpoint of the features of the construction organization activities. The necessity of creating such reserves for construction organizations conducting warehouse accounting is proved.

Subject of the study: features of accounting for inventories in construction organizations and their reflection in the financial statements in accordance with the principles of reliability.

Objectives: to justify the need to create reserves for reducing the cost of inventories in construction organizations.

Materials and methods: the question of creating reserves is considered from the point of view of the requirements of Russian accounting standards and international standards in relation to the valuation of stocks in a warehouse.

Results: the reasons for creating reserves for reducing the value of material assets are formulated, the features of stock accounting in construction organizations are studied.

Conclusions: the degree of reliability of the financial statements significantly increases when reflecting the value of inventories in the balance sheet in a net assessment, taking into account reserves for reducing the value of material assets.
Landscape architecture spatial management for urban construction implementation of main streets, case study in Bacgiang city
Authors: Thi Lan Phuong Nguyen
Published: July 2020

In the process of development, management of urban space is always a key task to ensure the urban face and identity of each urban area; it is always expressed through urban accents, the main roads and route of the urban area, which is also the landscape architecture on both sides of the main urban transport route. The transport system attached to the efficient use of land on both sides of the road is a product of urban space management to express the urban image and increase urban attractiveness and competitivesness index of the city. This paper adopts a pilot study on a number of major roads in Bac Giang city – a type II urban area and an administrative and political center of Bac Giang province to introduce and propose suitable management tools for managers to control the construction and development process of urban area in Bac Giang city in particular and in big cities in Vietnam in general.
Analysis of the efficiency of works at capital repair of civil buildings
Authors: Korol Oleg , Kustikova Yuliya , Antoniadi Valeriia
Published: July 2020

The operation of buildings is the longest stage of the operational cycle of buildings. Repair and construction work is carried out at regular intervals to maintain the normal technical condition of real estate. Their effectiveness depends on a number of factors and may be improved due to the developed system of measures.
Reconstruction of Kropotkin city in Krasnodar Region in medium term perspective
Authors: Kasyanov Vitaliy , Marchenko Ivan
Published: July 2020

Present article provides an overview for the organization of reconstruction in Kropotkin city of Krasnodar Region in the medium-term perspective. During the research we’ve considered particular features of real estate development and conditions of the urban environment at the present moment. This study is relevant due to presence of city problems in the field of urban planning and reconstruction. In this regard, purpose of this article is to formulate recommendations to overcome above stated problems. Analysis and synthesis were the main methods used in the research article. As a result of the research recommendations were developed to address some of the problems in urban development and reconstruction of the Kropotkin city.
Unified informational statistical base as a tool for monitoring energy efficiency of industrial facilities
Authors: Taskaeva Natalia , Meshcheryakova Tatiana , Shchepkina Natalia
Published: July 2020

Sustainable development of the global and national economies requires special attention to optimizing the structure of the energy balance by creating effective energy saving tools and improving energy efficiency of those types of economic activities that are the largest end-users of energy resources - industry, population and transport. The article defines the problems of energy policy in the industrial sector of the economy. Of key importance in the study are the prerequisites for the formation of a methodology for assessing the energy efficiency class of industrial facilities. The article provides information on the dynamics of energy intensity from 2010 to 2018 and information on the planned indicators of reducing the energy intensity of the national economy. The comprehensive plan of measures to improve the energy efficiency of the economy of the Russian Federation, approved by the Government, contains a link to the rating system of industrial enterprises planned for development, which confirms the relevance of the research topic. An analysis is made of public information about industrial enterprises, on the basis of which problem areas are identified for the formation of a unified information statistical database, proposed as a basis for monitoring energy efficiency indicators of Russian industry and identifying priority issues for the implementation of specialized state programs.
Conceptual basis for the development of Methodology for assessing the energy efficiency classes of industrial facilities
Authors: Solopova Natalia , Meshcheryakova Tatiana , Shchepkina Natalia
Published: July 2020

The lack of developed methodological solutions for determining the energy efficiency class of economic entities limits the ability to achieve the goal of the State program of the Russian Federation “energy Efficiency and energy development” to reduce the energy intensity of the gross domestic product. To solve the set state tasks aimed at reducing the energy intensity of the national economy, it is necessary to develop a Methodology for assessing the energy efficiency classes of industrial facilities. The development of the Methodology will become a prerequisite for the implementation of measures to ensure energy-efficient policies of energy-intensive enterprises. The methodology will ensure effective planning of budget funds allocated for energy-saving measures, as well as a systematic reduction in the energy intensity of the national economy. The aim of the study is to create a Development Concept for a Methodology for assessing the energy efficiency classes of industrial facilities, defining the goals of its creation, the most important problem it is aimed at solving, identifying the methods and approaches that it relies on, reflecting its development plan, as well as expected results. The proposed Concept for developing a Methodology for evaluating the energy efficiency classes of industrial facilities, presented in the form of the model, will identify the basic elements that should be taken into account when developing it, and assess how harmoniously they are combined. The practical significance of this concept is that it creates a fundamental basis for the development of Methods for evaluating the energy efficiency classes of industrial facilities, taking into account the specifics and scale of their activities.
Using AHP technique to evaluate the situation of construction e-procurement institutionalization
Authors: Tran Quangdung , Anthony Stewart Rodney , Drew Steve
Published: July 2020

This study focuses on evaluating the situation of e-procurement institutionalization in the construction industry under three perspectives including internal organization, operational clusters, and industrial supports. Data collected by in-depth structured interviews with key managers from within a sample of 31 Vietnamese construction firms was analyzed to assign weights to measures through the AHP technique. The results can be used by business managers to build an effective action plan toward e-procurement sophistication and by government policy makers to formulate targeted supportive programs for e-procurement in the Vietnamese construction industry.
The Investment and Construction Activities Transformation at the Modern Development Stage of Russia
Authors: Yaskova N , Kolosova T
Published: July 2020

Global changes related to demographic and migration processes, technological revolution, anthropological shifts call for quality changes in the capital fund structure. Their qualities, purpose of uses, location and other aspects are determined by the readiness of the investment and construction activities to solve crucial issues in the country’s social and economic development. It requires the transformation in the investment and construction activities. The methodology. Taking into account the country’s economic condition, the project approach to development will affect all the industries and spheres of the national economy. The necessity of applying systemic, structural and projective methods for investment and construction activities analysis is being updated. Systemic and dynamic modelling of evolutionary trends in various types of construction activities will require the development of ways to bring them into mutual conformity, as well as the adoption of approaches for the territorial localization implementation, which together will make it possible to give methodological tools an expedient nature, as well as justify not only “points of increase”, but also the negative trends’ “break points”. The results and their discussion. The debatable perspective for specification of goals and measures for the construction development currently mainly deals with housing development sector, the creation of the environmental amenity, relocating the citizens from the failing housing stock, as well as digitalization. Particular types of the construction activities, infrastructure construction, and organizational, economic, technical and technological aspects of the investment and construction activities are still left beyond the scope of the National Projects and Development Programs. The conclusions. Following the established line of research, the development of new objectively sought-after investment and construction activities characteristics shall provide for its target mode and give national economy capital funds development the sustainable anti-crisis nature.
Determination of Collapse Load of Engineering Structures using Iterative Node-based Smoothed Finite Element Analysis Method
Authors: Tran Van Phuc , Hoang Vu Le , Nguyen Cong Duc , Pham Ngoc Tien
Published: July 2020

This paper presents an iterative limit analysis scheme modeled within a three-node node-based smoothed finite element framework incorporating a so-called modified elastic compensation method to determine the ultimate bearing capacity of ductile structures. More explicitly, the approach iteratively reduces those elemental Young’s modulus associated with a high-stress intensity such that the inelastic behavior of the elastic-perfectly plastic material model is taken into account. The approach provides good accuracy and convergence of solution through a series of standard linear elastic analyses that make possible the application in large-scale engineering structures, even the one with complex geometric configurations, and hence eminently accessible to structural engineers. As a result, complex inelastic analyses are eliminated and computational cost is significantly reduced. Several benchmark examples, one of which reported, illustrates the efficiency and robustness of the iterative limit analysis approach in tracing the load multipliers of in-plane ductile structures from the beginning until convergence of collapse load solution or failure state occurs. The yield areas at the ultimate state gradually appear in the graph of elastic modulus distribution.
Hydrotransport of river sediments in hydroelelators
Authors: Arifjanov Aybek , Rakhimov Kudrat , Abduraimova Dilbar , Babaev Askar , Melikuziyev Sarvar
Published: July 2020

The article considers the hydrotransport of river sediment in a cylindrical pipeline. To describe the nature of hydraulic phenomena, experiments were carried out for single-phase and two-phase flows. Based on the results of the experiments, the main hydraulic parameters of the suction pipeline of the hydraulic elevator were determined during hydrotransport of river sediment. Based on the processing of available data, as well as data from specially designed experiments, the dependences of the flow coefficient at the expiration of the slurry flow from the hydraulic elevator pipeline on the Reynolds number are valid, which are valid for certain limits of the change in Reynolds numbers. The design parameters of the hydraulic elevator are substantiated, calculation formulas are given for determining the characteristics of a hydraulic mixture consisting of a solid particle and a carrier fluid. The methodology for calculating the concentration distribution and the method for determining the bottom concentration are given. A calculation formula is proposed for determining the flow rate and flow rate of a hydraulic elevator slurry. As a result of the analysis of these experiments, the dependences of the concentration of solid particles on the relative pressure in the hydraulic elevator are established.
Dynamics of an earth dam with account for rheological properties of soil under dynamic effect
Authors: Yangiev Asror , Salyamova Klara , Turdikulov Khusanboy , Fayziev Xomitxon
Published: July 2020

The design, construction and operation of high earth dams in seismic regions of the republic require continuous improvement of the methods to calculate them on basic loads and special combinations of them, including seismic ones. The aim of this work is to improve the calculation methods for earth dams, taking into account the real physical and mechanical characteristics of structure and its foundation soil under various types of loads. Improved calculation methods make it possible to predict the stress-strain state of the most vulnerable points in the dam, which will lead to a reliable and safe operation of earth dams in seismic zones.
Distribution of turbidity in flow constrained by transverse dam
Authors: Bakiev Masharif , Yakubov Kuvonch , Choriev Jamshid
Published: July 2020

Construction of control structures in rivers allows to manage channel flow in required direction and artificially change its natural condition providing rational interaction of flow and channel. Redistribution of both liquid and solid flow occur under influence of control structures. The main goal of the given work is to set the distribution pattern of turbidity in flow constrained by transverse blind dam. For the first time the task is studied with the use of field research data from dam No.30 in Amudarya river. The location of section and verticals in choosing turbidity samples, the sections are set based on the hydraulic structure of deformed flow. Flow division scheme has been proposed for hydraulically homogeneous zones of weakly disturbed core, intensive turbulent mixing and backflow, as it is accepted in the theory of turbulent flow with mixture spreading in a confined space. For the verticals the samples were taken in two depth points 0.2H and 0.8H, and areas with shallow depth – at 0.6H. Turbidity distribution by depth in weakly disturbed core has the shape of a “boot” and μ 0,8H is 2-3 times higher than μ0,2H . The rest are close to logarithmic. The maximal turbidity at 0.8H is 3.6 kg/m3. Turbidity distribution in layout in the zone of intensive turbulent mixing is affine and comply with Shlihting-Abramovih’s theoretical relationship for starting point. The obtained results can be used in future to forecast interdam area sedimentation and new bank line borders.
The height of a damless water intake structure threshold
Authors: Ikramov Nazir , Majidov Takhir , Kan Eduard , Ikromov Ilhomjon
Published: July 2020

More than 80% of the annual water consumption in Uzbekistan comes from large transboundary rivers such as the Amu Darya and Syr Darya. The rest of the water is formed on the territory of the Republic. Almost all year round, the turbidity of the Amu Darya and Zaravshan rivers is 3÷5 g/l, reaching 15÷18 g/l during flood periods.in most cases, water from the rivers is taken into irrigation channels using damless water intake structures. In order to prevent the ingress of bottom sediments from rivers into channels, thresholds have been constructed at water intake structures, the height of which is set constructively. As a result, bottom sediments pass through thresholds and move along the bottom of channels, reducing their cross-sections, as well as filling the chambers of pumping stations and pressure basins of hydroelectric power plants with sediments. After getting into the flow parts of pipelines and hydraulic machines (pumps and hydraulic turbines), they lead to abrasive wear, as well as other negative consequences. A lot of work has been done to prevent sediment from entering through water intake structures, but so far none of these proposals has provided an effective solution. In the laboratory of the Tashkent Institute of irrigation and agricultural mechanization engineers, a series of experiments were conducted on a glass hydraulic tray to determine the height of bottom sediments, taking into account their heterogeneity. Based on experiments, the dependence on determining the height of the ridge is derived. Based on the obtained dependence, a method for determining the height of the threshold of a damless water intake structure is proposed. This technique was experimentally tested on a laboratory tray. Specifying the threshold height will lead to optimization of capital costs for the construction of the threshold of the water intake structure, as well as reduction of operating costs for cleaning channels from sediment and repair work of hydraulic machines from hydroabrasive wear.