bluuebunny/crossref_metadata_2025_split huggingface dataset:
On the crack-tip asymptotic fields
Authors: Kuznetsov Sergey 
Published: July 2020

Abstract
Analytical expression between the vectorial stress intensity factor (SIF) and displacement discontinuity intensity factor (DDIF) is derived for an arbitrary shaped plane crack with a smooth crack boundary. The crack is placed in an elastic anisotropic medium with monoclinic symmetry (syngonium). The analysis is based on constructing the outer and inner asymptotes for the corresponding surface stress and displacement discontinuity fields at the crack boundary. The closed form operator of the class -1 in Hörmander 1/2-space of the theory of cracks along with the associated amplitudes and symbols are constructed. Both strain and displacement fields assumed to be infinitesimal.
Moisture content and its influence on glued timber structures
Authors: Ermakov Valentin , Stepanova Ekaterina 
Published: July 2020

Abstract
The glued timber structure is well-known worldwide engineering product nowadays. Extensive knowledge of wood structure behavior has been as important basic to create new design projects. This paper presents the issue of determining moisture content (MC) in load-bearing glued wood structures, depending on a value of indoor relative humidity and temperature. There are two ways to study timber moisture content – calculation (manual or in programs) and measurement methods. this ways complement each other. Each of methods is more or less suitable for monitoring of structural elements or not suitable at all. Graphs, tables or 3D models of timber moisture content distribution in structure are can received using these methods. Two simple equations to determine timber moisture content are given in the paper. Besides, effect of timber moisture content on durability properties of wood structure is describes there.
Surface Rayleigh-Lamb waves in stratified substrate
Authors: Avershyeva Anna 
Published: July 2020

Abstract
Propagation of Rayleigh - Lamb waves has shortage of theoretical studies and demands in deeper analyses. Understanding the process of propagation of Rayleigh-Lamb waves depending on the geometrical and acoustical properties of the individual layers within the Earth’s crust is of great importance for the NDT of Earth exploration and development of seismic protection of buildings and structures. Propagation of these waves in the Earth’s crust upper layers is studied by analytical methods. A mathematical model for analyzing Rayleigh -Lamb waves propagating in stratified media is worked out. The analytical solution is constructed using Cauchy complex formalism and the method called Modified Transfer Matrix (MTM). As an example a multilayer system modeling the Earth’s crust, consisting of sedimentary rocks, a layer of granite, basalt and mantle, is considered. Equation for dispersion relations is derived. Fundamental modes of the dispersion curves for a stratified media are obtained.
Rapid reliability control of products in construction
Authors: Chiganova Nadezhda 
Published: July 2020

AbstractThe paper considers the method of rapid control of the reliability of construction products, based on the approximation of the mathematical expectation and variance of the process of changing the technical parameters of products over time by linear functions. When constructing the method of rapid reliability control in the normal mode, we will proceed only from an analysis of the external manifestation of the product wear process, that is, an analysis of the nature of the change in the technical parameters of the products over time. Therefore, we restrict ourselves to considering such methods of preliminary tests, which involve measuring the values of the technical parameters of each product of a sample of volume n at some points in time t. The order of preliminary studies and rapid control is considered as an example of a special case when the change in the technical parameters is approximated by a random process with a normal distribution density. A criterion is proposed by which at the stage of preliminary tests the question of the applicability of this control method to a specific type of product is solved. Formulas are found for calculating the characteristics of the rapid control plan for construction products for given risks of the supplier and customer.
Modeling the fracture behavior of Ultra - High Performance Fiber Reinforced Concrete slabs under contact Blast Loading
Authors: Hoa Pham Duy , Le Ba Danh , Thang Nguyen Cong , Tu Tran Huu 
Published: July 2020

Abstract
This paper presents a fracture behavior modeling of Ultra-High Performance Fiber Reinforced Concrete (UHPFRC) slabs under contact blast loading using the finite element method. The UHPFRC is supposed to be brittle material and follow the Johnson–Holmquist-II(JH-2) model. The steel rebar is modeled using the elasto-plastic model. The Emulsion Explosive has been used and modeled by the SPH method. UHPFRC slabs with the dimensions 1000mm of length, 800mm of width and 120mm of thickness is considered. The steel fibers with a volume fraction of 2% is used. The UHPFRC material is fabricated in laboratory using the material available in Vietnam. The concrete crater and spall damage of UHPFRC slab under contact blast loading are considered. The numerical results are compared with experiment. These results allow to evaluate the resistance against blast load of UHPFRC fabricated in lab.
Use of Reengineering in Construction
Authors: Sborshchikov Sergei , Lazareva Natalia , Kochenkova Elizaveta 
Published: July 2020

Abstract
The article discusses the use of the methodology of reengineering in the investment-construction. The goals, tasks, various options for their solution, application areas of reengineering in construction are identified, as well as its basic principles and development directions are formulated in the article. In this regard, it is assumed, that practical use of reengineering methodology will contribute to the creating of the comfortable and safe living environment, as well as competitive advantages of the building construction organizations, aimed at the reduction of cost and terms of works realization, increase of productivity and production quality. Works of foreign and domestic scientists are used as initial materials on the research issues, and functional and structural analysis are taken as cognition methods. In this regard, a retrospective of reengineering is investigated, a definition of this concept and its qualifications (“capital construction facility reengineering”, “business process reengineering”, “technological process reengineering”) are given, and directions for use in the investment-construction activities are established. At the corporate level, there are three types of reengineering: business processes, technological processes and capital construction facility. The article presents the distribution of these types of reengineering on the timeline of the investment-construction, as well as the distribution of participants by types of reengineering, the volumetric nature of reengineering is noted. It is shown, that a specific type of reengineering is the reengineering of territories and buildings and possible directions of its impulse are presented. Considering the sectoral level as the highest level in the hierarchy, the possible options for initiating reengineering “top-down” and “bottom-up” are established, and factors influencing this process are identified.
Management of the organization of production of building materials and products
Authors: Tikhonov Anatoly 
Published: July 2020

Abstract
the article describes the main stage of technological techniques and methods of automation of technological objects for the production of building products for the formation of structural schemes of organizational (manufacturing and implementation) control systems. A static characteristic of demand for construction products and a system of coordinated decision-making between the technical services of production and sales of products are developed. A generalized block diagram of the supply and demand management system for building materials and research is given. The functional dependence of the amount of profit on the quantity of produced building materials and products at the enterprises of the construction industry is formulated. Key words: production of building materials and products; management systems for the production and sale of building materials and products; demand, price and supply of products in the market; decision-making bodies of the organization of production and distribution of products; static characteristics of the demand for the product, its prices and profits from sales; feedback principle; adaptive (with fuzzy logic) control system; external disturbances; mismatch signals between supply and demand.
Management Model for Nuclear Power Station Project in Vietnam
Authors: Tuan Hai Dinh 
Published: July 2020

Abstract
Vietnam’s economy has been increasing quickly since 1986 to increase for several times. This leads to an increase in energy demands to satisfy for actual requests. To overcome future shortages of electricity, the Government of Vietnam has been preparing for its nuclear power plants during the past 20 years with many issues and matters must be considered seriously. One of them is which management model is mostly suitable and how to select best models. Good selection can help the Government of Vietnam goes straight forward to final completion of the project on time, cost and quality as well as specific requirements of safe issues, country security, economic enhancement, etc. This paper has an objective to discuss several common management models for construction projects applied in both Vietnam and the world. Later, it will propose a most suitable model of construction management for the first nuclear power plants in Vietnam. The Government of Vietnam can use in considering on its selection process of its nuclear power plants planned to build in the future.
Decision-making theory methods as a tool for choosing construction technology
Authors: Cherednichenko Nadezhda , Kuzmina Tatiana , Efimov Vladimir 
Published: July 2020

Abstract
The article discusses the problem of choosing the construction technology, which arises due to many factors. To find the optimal construction technology, it is proposed to divide the task into four stages. As a result, we come to the conclusion that it is necessary to consider this problem with the help of decision-making theory methods under conditions of uncertainty. Possible criteria for choosing the optimal construction technology are considered. The optimal production option is determined according to each criterion. Since each criterion has its own system for choosing the optimal construction technology, some sitework options do not fit on any of the criteria, therefore, according to the Paretto principle, these options can be discarded. Then, using linear convolution, one optimal construction technology is selected for each criterion. A tool for determination of the best construction technology using the methods of decision-making theory was obtained.
Efficiency of ultra-high-performance concrete applications on bridge construction
Authors: Binh Tran Duc , Tan Tran Van 
Published: July 2020

Abstract
Ultra-High-Performance Concrete (UHPC) is a new building material with many mechanical and technical features that are outstanding comparing with traditional concrete (Normal Concrete-NC). This has been proved by many studies in the world but mainly on technical point of view, and only a few researches have been mentioned the economic-technical efficiency of this new material. This study compared two alternatives of bridge design and execution, one using the UHPC girders and another using the NC girders, the case study of An Thuong Bridge project in Hung Yen city, Vietnam. The economic-technical efficiency of UHPC is considered in many aspects such as technical, economic, environmental and social aspects. Four research methods were used to assess the efficiencies of UHPC, the method using integrated criterion, estimation method, life-cycle cost, and life-cycle assessment method. Through expert surveys and analysis of each alternative design, the final result shows that using UHPC is more efficient than using NC. Indeed, the alternative using UHPC has a lower cost and less environmental impact than the NC alternative. However, these conclusions are only true in the case An Thuong Bridge project. For the other cases, the replacement of NC by UHPC should be considered according to particular situations before implementing it. This research is useful for bridge construction managers, construction material production enterprises, bridge construction investors, etc.
State Support of Building Complex through Mortgage Rate Reduction: Prospects and Risks
Authors: Kostrikin Pavel 
Published: July 2020

Abstract
In February 2020 the Russian government decided to develop public incentives for the mortgage rate reduction at least to 8%. What is the supposed economic effect of this decision? Can implementation of the new state program trigger another large-scale crisis on the market? The author makes an attempt to answer these extremely relevant questions by tapping into the experience of creation, development and a relatively recent failure of similar programs in the United States. The research done has revealed that the Russian government’s urge to harness the priming of economy through the support of mortgage lending, which was used in developed markets long ago, gradually gives rise to the same alarming symptoms that proved to be the forerunners of the world financial crisis in 2008-2009. Already available in Russia is an increasingly bulky and non-transparent system of mortgage loan securitization, a rapidly growing number of approved loans, mortgage rate reduction vigorously stimulated by the Russian government that brings about the gradual easing of claims on the quality of mortgage loans issued by retail banks in the backdrop of stiffening competition between banks and, as a consequence, the bank margin reduction. Thus all factors of the possible future collapse are on hand. The author comes to the conclusion that in order to prevent the situation getting out of control, the urgent development and adoption at the state level of scientifically grounded methodology is needed, whereby the development of real estate and contiguous sectors (banking infrastructure, in the first place) is to be put in sync with mechanisms of state support for the building complex.
Methods of computer modeling of cost models for buildings
Authors: Tyurin Ilya 
Published: July 2020

Abstract
The current methods of computer modeling of cost models created at the development stage of a building construction project are presented in the paper. The paper considers the world and Russian experience on the use of automation technologies in order to accelerate the formation of cost models for capital construction objects. The current approach to model formation is visualized, indicating the necessary components of the process.
Determining the Reasonable Degree of Specialization of Russian Companies Participating in NPP Construction Abroad
Authors: Grabovy Peter , Berezka Vitaly 
Published: July 2020

Abstract
NPP construction projects are distinguished by long construction periods (5-7 years), huge investments (up to 30 billion US dollars), and exposure to negative factors affecting the entire commissioning period and project cost. The complexity of the project management of such mega-project requires a set of special techniques and strong analytical and methodological support of decision-makers. The article discusses the practical aspects of identifying a reasonable degree of specialization of participating contractors. For an assessment of the contractor’s specialization level, the process specialization degree (DS
p
) indicator used. It describes the share of key types of works in their total volume, performed on their own. Construction company’s specialization considered as a vehicle ensuring the fullest application of state-of-the-art achievements of the construction science and technology in order to achieve the best technical and economic performance indicators of specialized entities, including improved labor productivity, reduced cost of works, maximized profit. The optimum specialization level and a degree in case of construction of major power complexes were assessed using the example of Belarus NPP chosen as a representative facility. The proposed approach to the determination of a reasonable degree of specialization allows construction entities to plan this parameter for short-term or long-term periods, to assess the economic efficiency of the specialization, subject to its increasing degree. As the achieving of the specialization degree is conditioned, the reasonable DS
p
delimitation is essential not only in economic but also in social terms. This article will be useful for the management of engineering, design, and contracting companies planning their participation (or already involved) in the investment and construction project in foreign countries.
Damage classification in concrete, mortar and cement-paste beams under bending by Acoustic Emission Technique (AET)
Authors: Nguyen-Tat Tam 
Published: July 2020

Abstract
In concrete, AET has been used to characterize the different fracture modes in flex-ural beams by RA method (described in RILEM TC 212 ACD recommendation). In this study, three-point-bending tests have been conducted on cement-based specimens (concrete, mortar and cement-paste) to promote tensile mode and/or shear mode in these specimens. Acoustic Emission (AE) raw data were filtered to remove noise from signals. Then, k-means algorithm, as a Pattern Recognition Analysis (PRA) method, was used to identify the similarities within the recorded signals and to classify the filtered-signals into groups. Clustering results by k-means according to a proposed process have proven efficiency in providing information on RA, AF, Rise-time, Duration and Absolute Energy (ABEN) related to mode I and mode II. Then, two damage classification techniques were used, in which RA method was applied to filtered signals. By these techniques, the proportion of mode I and II was specified and the location of demarcation line also fixed.
Optimal location of an intake at a reservoir prone to salt diffusion
Authors: Krutov Anatoly , Norkulov Bekhzod , Artikbekova Fotima , Nurmatov Panji 
Published: July 2020

Abstract
There are two main factors which prompt to look for an alternative to traditional approaches to the provision of drinking water. They are climate change and population growth.
Climate change and its increasing scale are no longer in doubt. It tends to increase the frequency and intensity of droughts. Changes in average water availability in most Central Asian river basins are estimated to be drastically big for the next 30 years. And, groundwater recharge may also be affected with a reduction in the availability of groundwater for drinking water in some regions.
Water use has been increasing worldwide by about 1% per year since the 1980s, driven by a combination of population growth, socio-economic development and changing consumption patterns. Global water demand is expected to continue increasing at a similar rate until 2050, accounting for an increase of 20 to 30% above the current level of water use, mainly due to rising demand in the industrial and domestic sectors.
These obliging to redefine the strategy for the use of water resources to ensure sustainable drinking water supply forcing the use of all available water resources even those that were not previously taken into account, for example, off stream storage reservoirs.
Research, development and innovation play an important role in supporting informed decision-making. Therefore, further scientific and engineering studies are also needed for the development of financially affordable, safe and efficient infrastructure services in the areas of drinking water supply, sanitation and hygiene and its components.
The article considers a particular reservoir the bottom of which is composed of saline soils operating in regular filling and emptying and subject to significant wind effects. The research conducted allowed to find a place of water intake location which provides a minimum salt content in the water abstracted.
Fundamentals of developing and designing portable weirs for farmlands
Authors: Choriev Jamshid , Muslimov Turavoy , Abduraupov Ramz , Khalimbetov Azat , Abdurakhmonov Sarvar 
Published: July 2020

Abstract
The article reveals the fundamentals of engineering and designing mobile weir with rectangular opening for farmlands, applicable for measuring discharge in interfarm and temporary canals. It includes the fundamentals of choosing most efficient structural solutions for the weir, choosing material for fabrication of its main elements, performing the static design for weir horizontal beams according to marginal states of providing reliability and stability of weir main elements. Results of calculations of diameter of steel bar for rectangular weir with B=25cm showed that the diameter needed is 6mm. The diameter is small enough for the weir to be called a thin plate weir. Thus, using 6mm bar is reasonable enough from the point of view of stability and the by the requirements for a thin plate weir.
Forecast of temperature and filtration regime of melt dams with liquid coolers
Authors: Aniskin Nikolai , Antonov A 
Published: July 2020

Abstract
The article discusses a joint temperature and filtration problem in relation to soil dams with seasonal liquid coolers operating in permafrost conditions. The problem is solved using the finite element method in a locally-variation formulation. A numerical model of the temperature and filtration regime of the “dam-base” system has been developed. Studies have been carried out with consistent consideration of the main operating factors. The results of the study of the temperature and filtration state of the structure, taking into account the factors of heat and mass transfer and phase transitions, showed that the use of liquid coolers is well suited for creating a monolithic frozen curtain at the stage of the start of the structure operation. The obtained regression equations can be used at the initial design stage (feasibility study) or for the analysis of the temperature regime of existing ones.
Evaluation of thermal cracks in mass concrete structures during construction
Authors: Aniskin Nikolay , Nguyen Trong Chuc 
Published: July 2020

AbstractDuring construction, the problem of temperature crack formation in mass concrete structures is really an important issue that needs attention and research. This paper provides an overview of the current criteria for evaluating the possibility of forming thermal cracks. At the same time, the concrete block under certain construction conditions was considered to predict the temperature field and thermal stress. Besides that, the numerical method has been implemented with the help of Midas software for structural analysis. The results obtained allow us to assess the risk of thermal cracking and compare it with the criteria used in actual construction practices.