bluuebunny/crossref_metadata_2025_split huggingface dataset:
Moment redistribution in concrete statically undetectable systems with FRP
Authors: Simakov O 
Published: January 2020

Abstract
Currently, engineers use, as a rule, the mechanics of elastic systems or take into account the inelastic properties of reinforced concrete without external reinforcement when performing calculations and designing the reinforcement of normal sections of reinforced concrete structures. It should be recognized that there is currently no model that takes into account the inelastic properties of normal sections of reinforced concrete elements with FRP. In this regard, an important issue is the evaluation of the influence of FRP on the redistribution of bending moments in a statically indeterminate system through a change in the stiffness of normal sections. This article analyzes the changes in the stiffness of normal sections, as well as the redistribution of bending moments in a statically indeterminate two-span beam on the basis of the existing model of inelastic deformations reinforced with external reinforcement sections with a model built on the basis of experiments (the actual stiffness of external reinforced normal sections).
Work flange connections of structural elements of an open profile on high-strength bolts
Authors: Shafray K , Shafray S 
Published: January 2020

Abstract
Design solutions of flange assemblies and their elements’ features for open structure rods of building structures are discussed in the article. The distribution of contact stresses both, between flanges and under bolt washers is obtained as a result of a numerical experiment. It is established that the nature of contact stress diagrams and the location (eccentricities) of lever forces depend on the ratio of flanges’ and bolts’ stiffnesses. The dependence of the bending moment in a flange on the magnitude of lever forces is revealed. High-strength connection bolts can work for eccentric tension, depending on the ratio of flanges and bolts stiffnesses.
Performance evaluation of the effectiveness of the use of core drivers in the construction of base plates
Authors: Chunyuk D Yu , Selviyan S M 
Published: January 2020

Abstract
This article is an example of the calculation of a foundation monolithic slab using void formers during the construction of an apartment complex consisting of three buildings located on one stylobation. In this example, we consider several options for calculating multi-hollow foundation slabs in order to determine the most cost-effective design. At the same time, a multi-hollow foundation slab should have the same rigidity and load-bearing capacity as usual.
Multi-factor analysis of technological operations of extinguishing exterior walls with a heat-insulating layer from concrete of low heat conductivity
Authors: Kustikova Y O 
Published: January 2020

Abstract
Improving the manufacturability of the construction of external walls in monolithic housing construction is achieved due to new structural and technological solutions. The main advantages of the technology of erecting monolithic external walls using concrete with low thermal conductivity in the heat-insulating layer are the reduction of the organizational and technological stages of erecting the external walls with the elimination of the technological gap between the stages, the absence of the need to attract specialized performers to erect the heat-insulating and enclosing layers of the wall, eliminating additional installation work and dismantling scaffolding during the construction of the facade, as well as reducing the number of manual processes and the nomenclature of building materials and products, the use of which is limited by the seasonality of work or requires additional costs to ensure their design physical and technical characteristics. To assess the significance of factors, a multivariate analysis technique was used.
Increase of fire protection and strength of wooden structures by modification in a thin surface layer by nanodispersion composites
Authors: Pokrovskaya E N 
Published: January 2020

Abstract
Currently, the industrial construction of multi-storey houses of wooden structures (DK) is increasing. In world practice, multi-storey buildings from a recreation center are being built in Austria, Great Britain, Norway, and Canada. In Russia, 9-13 storey buildings are being designed using a recreation center. High-rise construction using a recreation center for earthquake-prone areas is especially relevant. For modern multi-story building from a recreation center, effective surface fire protection should not increase the weight of structures. At the same time, their strength should increase. The solution of complex issues of DC fire protection in thin layers with a simultaneous increase in its strength is an unresolved problem.
Account of the force resistance in the calculation of reinforced concrete structures
Authors: Borovskih A V , Gorbachevskii V P , Pachomova L A 
Published: January 2020

Abstract
The aggressiveness of the environment of their placement has a direct impact on reinforced concrete structures. This work is aimed to present the method for constructing fundamentally modified equations of the force resistance of concrete and reinforcing steel. The results of this work present the method for the constructing quasi-linear equations of the force resistance of concrete and reinforcing steel for use in the calculation of reinforced concrete structures. The sequence for producing a quasi – linear equation of the force resistance of concrete and reinforcing steel, as well as the diagram of the stress – total relative deformations is presented.
Methods for subsoil modelling under dynamic impacts and multicomponent damping in SCAD FEA software with geophysical monitoring
Authors: Nuzhdin Leonid V , Mikhaylov Victor S , Voskresenskiy Mikhail N 
Published: January 2020

Abstract
In this paper, an integrated technology for performing finite element calculations in SCAD Office FEA-software and identification of dynamic characteristics of Soil-Structure Interaction models with the use of geophysical hardware REGISTR and SINUS is proposed.
Optimization of plane frame structure with consideration of semi-rigid connections
Authors: Van Tran Thi Thuy , Quyen Vu Thi Bich , Thuy Nguyen Le 
Published: January 2020

Abstract
Beam-column connections play an important role in the load capacity of frame structures. In Vietnam, in the current design calculation standards for steel frame structures, to simplify calculations, the beam-column connections in the frame structures is considered as the two idealized extremes of either rigid connection or pinned connection. The actual behavior of beam-column connection is neglected. The paper presents the optimization calculation of steel frame structure taking into account the semi-rigid beam-column connections. The optimization problem is solved by Genetic algorithm method and the calculation procedure was implemented by Matlab programming software. Some numerical examples are conducted and from there the conclusions and recommendations of calculations and design of steel frames will be proposed.
Comprehensive assessment of fire protective intumescent paint “terma”
Authors: Eremina T Yu , Korolchenko D A , Kuznetsova I N 
Published: January 2020

Abstract
Fire protection of steel structures is aimed at increasing their fire resistance, the indicator of which is the fire resistance limit. The paper presents a calculation approach to solution of the problem of critical heating time determining for building structures with intumescent compositions. Methodological approach for assessment of heating layers of intumescent fire protective coating for different types of steel structures is developed. The applied approach allows taking into account the influence of the basic thermophysical parameters of the fire protection composition on its efficiency. The paper presents the calculations for a particular coating, which allow to determine the dependences of the thicknesses of dry layers on different reduced metal thicknesses and to obtain relevant correspondences between the calculation results and experimental data.
Limit state of steel reinforced concrete round plates in the operational stage
Authors: Razzakov S R , Razzakov KH S , Razzakov J S 
Published: January 2020

Abstract
The results of the study of round thin reinforced concrete thin reinforced concrete and steel concrete slabs with external sheet reinforcement at short and long operational load are presented. According to the results of theoretical and experimental studies, the behavior of thin plates at various stages of the stress-strain state and also the possible fracture patterns, taking into account the flexibility of the contour structures of the changing properties of the materials and the duration of operation, are revealed.
An analytical solution to the problem of bending-torsional vibrations of a thin-walled rod
Authors: Ibragimov A 
Published: January 2020

Abstract
The article provides a brief overview of the works devoted to the stability and bending-torsional vibrations of thin-walled rods. The problem is formulated and an analytical solution to the problem of bending-torsional vibrations of a thin-walled rod is given. The analysis of the obtained solutions is given.
Seismic barriers: mathematical foundations and dimensional analysis
Authors: Ilyashenko A V 
Published: January 2020

Abstract
The concept of a vertical barrier embedded in soil to protect from seismic waves of the Rayleigh type is discussed. The principle idea for such a barrier is to reflect and scatter wave energy by the barrier, thus decreasing amplitude of surface vibrations beyond the barrier. Numerical FE simulations of a plane model are presented and discussed.
Simulation of Wireless Network Throughput in Providing the Monitoring of Building Structures
Authors: Grigoreva S V 
Published: January 2020

Abstract
The article shows the feasibility of using wireless networks in the field of construction monitoring. It is established that there is a need to increase the data transmission rate over the network in order to collect readings from distributed sensors in order to timely detect defects in building structures. An experiment with predefined parameters for the size of the transmitted packets was conducted using a software implementation of a model of network throughput assessment.
Towards Building Information Modelling for diagnosis, assessment and rehabilitation automation for existing buildings
Authors: Garyaev N A , Ayoub F 
Published: January 2020

Abstract
While building information modelling (BIM) developed for new buildings, the majority of existing buildings needs to be maintained, rehabilitated or reconstructed. The promising benefits of BIM motivate the researchers to extend the BIM functionalities for existing buildings. This paper presents a BIM-based computer application that we have developed for diagnosis of concrete structural elements based on a knowledge base acquired from multiple references and the opportunities of BIM technology.
The impact of hydro-wear parts of pumps for operational efficiency of the pumping station
Authors: Mamajonov M , Bazarov D R , Uralov B R , Djumabaeva G U , Rahmatov N 
Published: January 2020

Abstract
During the work considered questions of the occurrence of cavitation in hydro abrasive flows, which can lead to a rather complex phenomenon that is difficult to understand the essence of this process. Today, the wear of the working bodies of centrifugal and axial pumps, depending on the mode of their operation has not been learned much, and there has been developed a technique for selecting operating modes, taking into account the wear of their parts. Also, the results of complex laboratory and field studies on the intensity of wear of the flow elements of centrifugal and axial pumps are presented. It has been established that the alternating, pulsating load leads to an increase in the force of interaction of the hydro abrasive flow with the camera surface and increases its wear by 10 %, and also reduces the capacity of the pumping unit to 9%.
Search for optimal methods for calculating atypical spatial structures on the example of a climbing wall
Authors: Tarasov A V , Loktev D A , Deordiev S V , Petuhova I Y , Tarasov I V 
Published: January 2020

Abstract
The article presents an analysis of approaches to solving non-standard spatial structural schemes with the use of modern modeling and calculation tools, by the example of the construction of the climbing wall of a complex spatial shape.
Prediction of compatibility of polypropylene and modified basalt fibers
Authors: Galitseiskii K B , Matseevich T A , Askadskii A A 
Published: January 2020

Abstract
The compatibility of polymer structures was forecasted using the calculation scheme proposed by one of the authors for the analysis of polymer compatibility. The forecast was made for composite materials based on secondary polypropylene (PP) and short-chopped basalt fibers (BF). To verify the accuracy of the prediction, BF was treated with CCl4 vapors in a flow reactor in order to replace oxygen atoms with chlorine atoms. Next, the chlorinated surface was treated in a stream of CH4 to replace chlorine with hydrocarbon groups. Composites contained from 5 to 20% BF; each composite was heated at temperatures of 500, 650 and 750°C. The chemical structure of hydrocarbon groups most compatible with PP was determined by calculation using the Cascade computer program (INEOS RAS). IR studies, microanalysis, and X-ray fluorescence analysis showed the presence of such groups on the surface of BF that are chemically bonded to silicon atoms. The surface treatment performed by BF improves the mechanical properties of the composites. The modulus of elasticity reaches 2120 MPa with a BF content of 20% (for secondary PP this module is 705 MPa). The strength is 44,5 MPa (for secondary PP, the strength is 26,5 MPa). The specific impact strength reaches 18,3 kJ/m2 (for the initial secondary PP, this value is 14,4 kJ/m2).
An analytical solution with a given accuracy for a nonlinear mathematical model of a console-type construction
Authors: Orlov V , Kovalchuk O 
Published: January 2020

Abstract
On the basis of the results obtained for one of the variants of the mathematical model of the console-type construction with sudden application of the load described by a nonlinear differential equation, an analytical approximate solution with a given accuracy is constructed. The results of the numerical experiment are presented. The proposed mathematical approach allows on the basis of analytical solutions to calculate for any point the coordinates fracture during bending of the beam.
On the theory of constructing a numerical-analytical solution of a cantilever beam bend nonlinear differential equation of the first order
Authors: Orlov V , Chichurin A 
Published: January 2020

Abstract
We consider a first-order nonlinear differential equation with a movable singular point. For this equation, we built an analytical approximate solution of the special form. The theorem allowing obtaining an a priori estimation of such solution is proved. To illustrate theorem and our constructive approach we give the example. The given method may be generalized to nonlinear differential equations of the higher orders.
Arrival Probability Based Parking Algorithm for Elevator Group Control Systems
Authors: Ciflikli C , Tartan E O 
Published: January 2020

Abstract
A main concern in elevator group control system (EGCS) is quality of service in terms of average passenger waiting time. If no parking algorithm is applied, when an elevator enters an idle state, it remains at its current floor. An additional enhancement for the system can be using parking algorithms and sending idle elevators to park floors to reduce passenger waiting times. In elevator traffic, passengers are considered in three groups according to their travel intentions as incoming, inter-floor and outgoing passengers. Traffic components representing the ratios of these groups are major factors in determining traffic pattern. Overall passenger arrival probabilities can be described by weighted sum of incoming, inter-floor and outgoing arrival distributions with corresponding traffic components. Then, arrival probabilities can be used to obtain a general adaptive parking algorithm. In this study we propose a parking algorithm for EGCS based on arrival probabilities and investigate average waiting time under varying traffic conditions.
Finite element modelling of unbonded post-tensioned simply supported beam
Authors: Barkaya T R , Gavrilenko A V 
Published: January 2020

Abstract
This paper describes an experience of designing of some finite element models of unbonded post-tensioned simply supported concrete beam. It was purposed to evaluate a bending moment capacity, crack resistance, increment of pre-stressing force in reinforcement and deflection of models. Their behaviour under gradual loading was in the spotlight as well. There is short information about preliminary performed experimental study of beams. Parameters of physical models of beams obtained from experiment were used as initial data while finite element models were being created. Discussion of results obtained is listed. Their comparison with an experimental data is done.
Investigation of Phase Portraits Belonging to Polynomial Dynamic Systems in a Poincare Disk
Authors: Andreeva I A , Efimova T O 
Published: January 2020

Abstract
The paper describes especially developed research methods and results for some original study of a broad dynamic systems’ family, which is characterized with the reciprocal polynomials in the right parts of differential equations which compose a system. The goal of this work is to obtain and analyze all the existing (and different in the topological meaning) phase portraits in a Poincare disk, as well as to indicate the criteria of each topological type of phase portraits appearance. Poincare methods of sequential transformations and displays have been successfully used along with a whole set of new research techniques developed for the purposes of this study. Over than 250 of different portraits were obtained and depicted eventually for different subsystems belong to the dynamic systems’ family under consideration. All portraits were described up to each the so-called invariant cell of the phase portrait, a boundary of it, and features of a phase flow in it, including it’s a source and a sink. Results of dynamic systems’ behavior research are useful for a wide spectrum of applications such as the mathematical modeling of physical processes, vital problems of civil engineering, for example, in the consideration of seismic stability of buildings etc., computing and producing systems, biological phenomena, and of sociological events.
About applicability of semi-Markov models of operation
Authors: Khayrullin R Z 
Published: January 2020

Abstract
The methodology is proposed for assessing the applicability of stationary semi-Markov models for the problems of efficient operation of control and measuring equipment. The methodology is based on the Euler method of construction a fundamental system of solutions for a system of ordinary differential equations with constant coefficients. The methodology is founded on the calculation of all eigenvalues (spectrum) and eigenvectors of the matrix of the system of differential equations. It is shown that for the classical model of operation of measuring equipment for a typical range of variation of the main parameters of the model (probabilities of failure, false failure and undetected failure), the characteristic equation of the system has two invariant eigenvalues and four eigenvalues that can be considered us functions of the model parameters. A qualitative analysis of the dependence of the spectrum of the matrix on the parameters of the model is carried out. The dependence of the non-invariant real eigenvalue, which plays a key role in the convergence of the solution of the dynamic model to the solution of the stationary semi-Markov model, on the parameters of the model is investigated in detail. The results of mathematical simulation are presented.
Modeling of subsidence of anthropogenic soil containing ice lenses
Authors: Bord E G , Shevchenko A A , Lavrov S N 
Published: January 2020

Abstract
The paper considers the possibilities of modelling of cyclic thermal effects on clastic water-saturated soil anthropogenic origin containing permafrost soil and ice lenses. In the formulation of the problem, there is uncertainty in the description of the structure of the layers, permeability coefficients, heat capacity and thermal conductivity. It is shown that the soil model allows the simultaneous implementation of filtration and convection modes depending on the degree of water cut in the layer. A formulation of the inverse problem is proposed, allowing an adequate interpretation of the log data.
Features extraction from non-destructive testing data in cyber-physical monitoring system of construction facilities
Authors: Kats V , Volkov A 
Published: January 2020

Abstract
Current paper presents a features extraction method when analyzing the acoustic emission (AE) control data of the technical condition of construction facilities as a part of decision support in cyber physical monitoring system. A set of statistical parameters that describe local properties of AE time series in time and frequency domains has been proposed. Furthermore, a features calculation method based on utilizing sliding windows with overlays in two time scales was introduced. Presented method has been pilot-tested during the technical diagnostics of the oil tank containing defects of different hazard classes.
Modeling of water permeability through the polymer nanocomposites
Authors: Matseevich Tatiana 
Published: January 2020

Abstract
The influence of chemical and physical parameters of polymer nanocomposites on the water permeability is analyzed. The chemical structure of the matrix polymer and the polar groups grafted onto the surface of the nanoparticles lead to the greatest influence. A large influence is exerted by the concentration of nanoparticles, their shape and size distribution. The direction of the penetration front in the nanocomposite sample has a lesser effect.
Mathematical modelling in cyber-physical construction systems
Authors: Titarenko Boris , Titarenko Roman 
Published: January 2020

Abstract
This paper deals with the problem of mathematical foundation for information block of cyber-physical system (CPS). CPS requires the involvement of a variety of information technologies. Their effectiveness is related to methods of data processing of contaminated data sets. The robust estimation means minimizing asymptotic bias of the estimates in the presence of contaminating observations. In the contrast to the approach of P. Huber and J. Tukey, where robustness is minimizing of the asymptotic variance of estimates, minimax asymptotic bias method is based on the maximum likelihood approach assuming an arbitrary contaminating distribution. Examples of this approach for the most common probability distributions and the ways of applying this approach are also given.