bluuebunny/crossref_metadata_2025_split huggingface dataset:
FRP-Strengthening of Stretched Parts of Structural Elements by Cascade Multilayer Method
Authors: Danilov Alexander 
Published: November 2019

Abstract
The purpose of research is the analysis of applicability and effectiveness of cascade type multilayer models in design of structural elements strengthening by gluing on their surfaces fiber reinforced polymers (FRP). Materials and methods: variants of using the FRP-reinforcement for stretched and bent elements with application of FEM simulation and analytic approach. A number of diagrams and tables represent the results. Design examples include the analysis of the adhesive joints application to attach FRP elements. Results are: justification of an efficient and cost-effective method of strengthening the stretched and/or bent elements to increase their bearing capacity reserves, the features of the bonded joint behavior, the equations and formulae for analysis and design. Analytical expressions are obtained and presented for designing the cascade strengthening schemes. Conclusions: the expression “cascade” reflects the features of the proposed strengthening layout, the reinforced (base) element unloading progress gradually along its length with each successive reinforcement element (strengthener) attached. The results suggest the possibility of effective use of adhesive joints to strengthen rather strong, including steel, elements. The cascade method allows to diminish the strength level of applied materials, thereby reducing the cost of reinforcement structures and increases the safety level of the reinforcement structure.
Optimization of Atrium Geometry in an Office Building in Terms of Daylighting - a Case Study
Authors: Iringova Agnes 
Published: November 2019

Abstract
The importance of daylighting in the design of microclimate for work and living spaces. Legislation and legislative requirements for daylighting and combined lighting of workspaces in Slovakia. Theoretical analysis of physical determinants affecting the function, geometrical design, and location of atria in buildings in terms of optimizing the light comfort in work and relax spaces. Exterior atria and their dimensions considering the boundary conditions of the site. Optimizing atria geometry depending on its function and location in terms of daylight distribution. Influence of the atrium height and self-shading on the daylight distribution in workspaces. Daylight intensity and evenness in the offices with windows facing exterior atria - model solutions. Designing atrium geometry for an office building considering microclimate optimization and light comfort in spaces for work and relax in terms of safety and energy efficiency - a solution example.
Determination of Stress Concentration Coefficient in Anchors’ Area of Composite Span Structures of Road Bridges
Authors: Mironov Andrey , Garanzha Igor , Vershinin V. 
Published: November 2019

Abstract
The article presents the results of analysis of the stress-strain state of a five-span composite structure of a road bridge, made on a beam unbroken circuit. The calculation is performed in the LIRA program complex under the elastic work of materials on the action of shearing and tearing forces. The main purpose of the work was to determine the coefficient of stress concentration coefficient (SCC) in the zone of rigid anchors for concrete slabs of the roadway. For this purpose, a section of a plate with a metal beam and unifying elements was modeled, broken down into small volumetric and lamellar bodies. This allowed us to analyze in detail the nature of the distribution of normal stresses along the height and length of the span structure. The obtained coefficient can be used when calculating the existing designs for endurance and strength, and also when determining the residual life of bridge structures to predict their service life.
3D Finite Element Stress Analysis of Reinforced Double-Tapered Glulam Beams
Authors: Sabouni-Zawadzka Anna Al , Gilewski Wojciech , Pelczynski Jan , Skowronska Malgorzata 
Published: November 2019

Abstract
The paper is dedicated to the stress analysis in reinforced double-tapered glulam beams within 3D computational model of orthotropic linear elasticity theory. Standard Eurocode design recommendations are the reference data to the finite element results. The results are presented for beams with a single and double line of reinforcement and compared with a non-reinforced beam. 3D elasticity model is an underestimation in comparison to the equivalent 2D model. Qualitative as well as quantitative analysis of the influence of reinforcements for the stress state of the beam is possible within a 3D finite element model. The proposed technique is especially recommended to estimate reduction of perpendicular to grain stress for a double line reinforcement in glulam beams.
Experimental Methods of One-floor Steel Constructions’ Seismic Stability – Analysis of Results
Authors: Olfati Rahmanuddin , Alekseev Sergei , Obodnikov Vyacheslav 
Published: November 2019

Abstract
The article discusses several particularly significant questions related to seismic stability of steel frames. The tests produce the result of steel frame endurance under different loads, implying the condition of structure’s weakening. The paper presents the study of natural seismic noise indices fluctuations, displacement amplitude, noise decrease under various designs and implication of the dynamic loads. The issue of the impact made on the dynamic characteristic of changes are represented in the article’s sections, as well as the review of possible experimental methods of determining the endurance of the frames under seismic loads. The paper represents the empirical study of artificially damaged steel frames performance under the dynamic load, calculation of the extent of steel frame joints displacement, the degree of changes under natural and artificial seismic noise with load implication. The work aims at objective conclusion of frame performance, and states that loads and artificial damages modeling produces ineffective results for estimating the performance of frames in real/natural conditions, due to the fact that the effect made by frame’s connection nodes and the base was not taken into consideration. The paper implies further research in the area, with regard to the joint functioning of the foundation base and the frame under the dynamic load.
Building Model of Behaviour of Concrete Under Load
Authors: Varlamov A. A. , Rimshin V. I , Norec A. I. , Davydova A. M. 
Published: November 2019

Abstract
The proposed new theory “theory of degradation”. The theory allows to define a curve of the behaviour of concrete. Conducted experimental research with the aim of charting the concrete for comparison with a new theory. The paper presents analysis of experimental data. Diagram of concrete is built according to
εb.short
= εb.el
+ εb.pl
+ εc.el

. Experiments for each part of the equations has been treated and constructed statistical dependence. The dependences obtained were the basis for building graphs and comparing them with charts of the theory of degradation
Selected Problems of Heat Transfer Measuring by Hotbox Apparatus in Climate Chambers
Authors: Ponechal Radoslav , Juras Peter 
Published: November 2019

Abstract
Hotbox measurements are used for obtaining U-values of homogenous or non-homogenous samples in climate chambers for some time. With constant increase of the thermal resistance and lowering the thermal loss arise the problem of these measurements. This is caused by the limited minimal wattage of the hotbox. This paper deals with the measurement in climate chamber, which purpose was to made calibration of the chamber and various measurements equipment. The calibration was made with usage of sample with high thermal resistance, extruded polystyrene. Described problems are chamber and hotbox limitation, sensors accuracy and high thermal resistance of the sample.
Stress-strain Analysis of Reinforced Concrete Beam Strengthened with Carbon Fibre
Authors: Panfilov Denis , Zhiltsov Yuriy , Pischulev Alexander 
Published: November 2019

Abstract
The paper presents results in experimental studies of a reinforced concrete beam strengthened in the upper and lower zones as well as with carbon fibre-based composite material. The authors consider the current practice of using carbon fibre as part of strengthening concrete structures, the current regulatory documents of using carbon fibre in the Russian Federation, regulatory documents containing information on strength and stress-strain properties of carbon fibre. The paper provides information on loading scheme, beam support conditions, the geometry of a reinforced concrete beam, physical properties of concrete and reinforcement of a sample; technical specifications of elements strengthened with carbon fibre. The results are presented by a curve of structural deflection under load in the conditions where the beam is tested without cracks and with cracks before reinforcement, and also with reinforcement. The studies presented in the paper show that the use of carbon fibre as reinforcement of bending structures allows us to increase the bearing capacity, rigidity and crack resistance of bending reinforced concrete elements.
Variant Design of Metal Dome Frame
Authors: Alpatov Vadim , Saharov Andrey 
Published: November 2019

Abstract
There are proposals for a reasonable choice of a cost-effective version of the metal frame of the dome. The selection is made from a limited number of alternative designs. Variants of designs differing from each other in the framework scheme. Evaluation of the economic efficiency of the options is made according to the cost of construction. Total cost is defined as the sum of the cost of manufacturing the structure and the cost of the materials from which the structure is made. The cost of manufacturing the design has been proposed to be determined according to the method of Professor Ya.M Likhtarnikov’s. The results of the calculation of the labour-consumption and cost of manufacture for the three variants of metal domes are presented. The definition of cost for three options of projects is presented and their comparison is made. A method for choosing the most effective option is presented.
Research of Road Pavement Survey Process Using Georadiolocation
Authors: Dormidontova Tatiana , Filatova Anastasia 
Published: November 2019

Abstract
The authors of this paper carried out a survey of road pavement and analyzed the need for such survey. The research was conducted using an operating facility as an example. In this paper, the decisions are grounded, the survey stages are described. Mobile methods of non-destructive control for road structures diagnostics are of particular importance at the moment. As a part of this research, the tasks related to determining the thickness of structural layers, the uniformity of materials, and the detection of voids under the auto-road surfacing were solved. The results of diagnostics and quality control of road-building works, as well as georadiolocation (GPR) technologies, are considered in detail. The results of tests of different GPR models and the economic efficiency of their use in road industry are described. The test results are illustrated with radarograms. The result of the GPR study of an auto-road section is presented. The results of the work showed that GPR research methods as a part of the survey allow reasonably planning and carrying out measures to eliminate and prevent various types of subsidence and road surfacing destruction, as well as to assess the nature and extent of the negative processes development. With the timely elimination of these problems, major damage and subsequent costly repairs can be avoided. Having compared the most significant factors, the authors make the conclusion that the method under research has got advantages, which are high efficiency and high capacity.
Design of Base and Foundation for the Earthquake-Resistant Building
Authors: Barmenkova Elena 
Published: November 2019

Abstract
The article presents the design of base and foundation for the earthquake-resistant 5-9-storey building of rigid structural system. The main technical idea is to exclude the most destructive components of seismic effects, which are transmitted to the lateral vertical walls of basements and foundations, and to reduce the interaction forces of the foundation soils on the foundation. The design of earthquake-resistant base and foundation includes a solid reinforced concrete foundation slab with criss-cross strips, freely supported on an intermediate sandy cushion, which separates the soils from the foundation slab, and the channels around the foundation.
Creep of Clayey Soil with Kinematic Shear, Taking into Account Internal Friction, Adhesion and Viscous Resistance
Authors: Ter-Martirosyan Zaven , Ter-Martirosyan Armen , Ermoshina Lyubov 
Published: November 2019

Abstract
The article presents the results of experimental studies of the ultimate shear resistance of clayey soil during kinematic shear (γ
1>γ
2>γ
3>γ
4), which are necessary for a quantitative assessment of the effect of shear rate on the magnitude of the ultimate shear resistance. It is shown that this effect is due to the viscous resistance of water-colloidal bonds between particles. Structural adhesion and Coulomb friction does not depend on the shear rate. A new rheological equation has been obtained, which makes it possible to describe the kinematic shear process at various compressive loads (σ) and shear rates (γ), with high accuracy, including the dependence of the ultimate shear resistance on the logarithm of the shear rate (Inγ). In this case, the shear resistance in the kinematic shear process grows more slowly than when describing the shear using the Maxwell model.
Bentonite Grout Backfill Technology for Underground Structures
Authors: Sokova Serafima , Smirnova Nadezhda 
Published: November 2019

Abstract
The article presents the basic methods of the most effective durable solution for the restoration of underground waterproofing of the structures in use, which are in impossible conditions for the application of outdoor protection. New types of resistance to aggressive environments of mineral waterproofing are considered, along with the technological scheme for the work. In addition, organizational methods have been developed for hydro protection of building structures. This technology can be applied from the basement of buildings in operation and be implemented at any time of the year. The proposed modern materials and technological solutions for the protection of underground structures of buildings were confirmed by the authors using an analysis carried out using the mathematical apparatus. Creating protection of premises against leaks from the mineral composition allows to increase the durability of the building itself, to ensure the normal operation of equipment and monitoring devices of the stations, as well as comfortable conditions for staff. Technological maps for the device of a new type of filling waterproofing have been developed, allowing to carry out and monitor all technological processes for operations.
Heat-resistant Binders Synthesis with Application of Alumina-containing and High-alumina Waste
Authors: Alexey Khlystov , Vladimir Shirokov , Dmitry Isaev , Vyacheslav Suldin 
Published: November 2019

Abstract
The article presents various methods for producing mixed heat-resistant binders able to harden in air at normal temperature. The processes of binders synthesis based on hydraulic cements and inorganic refractory industrial waste: aluminium-chromium petrochemical waste and expanded clay dust are considered to create high-temperature heat-resistant binders and concretes based on them. Light concretes with porous aggregates are offered to obtain a highly porous refractory material of air hardening.
Features of the Heat Engineering Calculation of the Enclosing Structures Industrial Buildings Operated in a Variable Thermal Conditions
Authors: Vytchikov Yury , Saparyov Mikhail , Kostuganov Arman 
Published: November 2019

Abstract
In recent years’ special attention has been paid to energy conservation. The need to reduce the consumption of mineral raw materials and fossil organic fuel is primarily associated with a reduction their reserves and, consequently, a constant increase in the cost. Therefore, a very actual task is to reduce the energy costs for heating and ventilation of industrial enterprises. The use of on duty heating during the non-working period can significantly increase the energy efficiency of an industrial building. On the basis the thermal regime of an industrial building, considered in the article, is shown the need to develop an engineering method for calculating the process of non-stationary heat transfer in buildings operated with a stand-by heating mode. This article presents the method of heat engineering calculation of building enclosing structures used in buildings with variable power of the heating system, which allows to determine the minimum allowable thickness of insulation from the condition of limiting the heating time of the outer wall. An example of the design calculation of the wall sandwich panel an industrial building is considered. An assessment of the specific energy consumption for heating external walls was made. A study conducted by the authors, allows to determine the range of thickness the enclosing structures, operated in conditions of a variable thermal regime.
Value Engineering in Construction as Synthesis of Methodology of Investment Flows Management and Price Formation
Authors: Lazareva Natalia , Kochenkova Elizaveta 
Published: November 2019

Abstract
Due to modern worldwide practice and investment construction and price formation analysis the necessity of application of value engineering methods is becoming as never justified at all the hierarchy levels of construction. The purpose of the work is to get a theoretical base of value engineering, which means to work out some quality model of running an investment-construction project cost-effectively, corresponding to the internal and external influences on the investment-construction activity and ensuring the ideals of the sustainability through the balance of the investment flows in the investment-construction field. Literature sources analysis are carried out to implement the goal. Methods of the system analysis and management, comparison, expert evaluation are used. Sufficient methodical base is presented in the article. The investment-construction structure is described with modern scientists’ works, the connections and correlations between the planning, financing and pricing subsystems are presented, the influence of these subsystems on the building construction subsystem is set out in the article. The investment flows are described through the structure and developed balance of the investment flows in the investment-construction field with a mathematical model. In the conclusion the necessity of application of the value engineering methods in the investment-construction field is justified and a mathematical model of synthesis of price formation and investment flows management, which is considered a theoretical base of value engineering, is formed.
Choice of the Rational Option of the Organizational and Technological Decision, Taking into Account the Exposure of Random Factors
Authors: Sborshchikov Sergey , Maslova Lyubov , Lazareva Natalia , Shinkareva Galina 
Published: November 2019

Abstract
Nowadays with investment lack and degradation of the traditional contracting form of construction the use of project-based management allows to implement investment and construction projects under the fixed time and cost constraints using the development of rational management decisions. The use of method of limited resources distribution based on priority of works and costs to compensate the negative impact of random factors during scheduling and feasibility studies of investment projects contributes to a more efficient use of allocated resources for the construction of units and more accurate planning of expenses. The authors give necessity evaluation of the implementation of comprehensive engineering support of investment and construction projects throughout the life cycle with maximum responsibility of the construction company to the customer under the highest concentration of managerial authority.
Influence of Geometrical Parameters of the Cross Section, Strength and Deformability of the Materials Used on Stress-strain State of Three-layered Reinforced Concrete
Authors: Tho Vu Dinh , Korol Elena Anatonievna 
Published: November 2019

Abstract
New concrete materials and their structures are increasingly diverse, so it requires extensive methods of calculating reinforced concrete structures, including multi-layered reinforced concrete structures. For usage in the practice of modern construction of multilayer structures made of concrete with different physic-mechanical characteristics, it is compulsory to conduct numerical studies of the stress-strain state of these structures under different types of loading. This paper analyzes the effect of cross section and concrete materials for the stress-strain state of three-layered reinforced concrete with light weight concrete in the internal layer and heavy concrete in the external layers. The analysis was carried out on three-layer beam samples with thickness 250mm, external layers of heavy concrete B12.5, B15, B20, B25 and the thickness from 40mm to 120mm; and internal layer from lightweight concrete - polystyrene concrete B0.5, B0.75, B1 and B1.5. The results of the study indicate that when the height and material of the extern layer changes, it greatly affects the stress and deformation state of the three-layer beam under the different loads. The obtained scientific results enable to determine rational parameters about geometric cross-section and materials used for various structural solutions of multilayer reinforced concrete structures. This would limit the number of actual test samples, increasing the efficiency of the experiments and practical production of three-layer structures.
Formal Expert Examination of Materials and Structures in Order to Assess the Possibility of Their Re-use
Authors: Bocharov Alexey Yu. , Gordeeva Tatiana E. , Spirina Ekaterina S. 
Published: November 2019

Abstract
The re-use of materials, structures and their elements in the construction of buildings and structures of various responsibilities is dictated by the need to reduce the cost of the final product. Quite often, the end consumer (that is the owner) does not even realise that re-used materials were apploed for the construction of the object. The global task in this case is the established possibility of such application through a safety perspective. This requires the examination of materials and structures in order to assess the possibility of their re-use. In this study, the authors develop a methodical approach to such examinations, based on the existing normative-technical regulations. They also take into account their experience in inspection of materials and structures of re-used pipe piles in building construction.