bluuebunny/crossref_metadata_2025_split huggingface dataset:
Analysis of bending plates with mixed boundary conditions using generalized equations of finite difference method
Authors: Gabbasov Radek , Filatov Vladimir , Dao Ngoc Khoa , Quyen Hoang Thi Linh 
Published: September 2020

Abstract
Currently, plates with characteristics of high thermal insulation, sound insulation and strength are sufficiently and widely used in structural engineering. To describing the connect of the plates with other elements, it is possible to give many calculation schemes on the different views. In this paper, it is considered the problem of rectangular plates, each side of which are fixed with hinged support or fixed support. This paper deals with the discontinuous points of boundary conditions with the use generalized equations of finite difference method. The obtained results of the analysis of stress state in discontinuous area of boundary conditions are compared with the results of work of Smirnov V.A.
Flexural buckling of a revolving bar in a rigid pipe with a gap exposed to axial force and dead weight
Authors: Yazyev S B , Ivanova P V , Konoplev Yu G , Yazyev B M 
Published: September 2020

Abstract
The article proposes a solution to the stability problem of a revolving bar loaded with axial force and inserted into a rigid pipe with a gap by the Bubnov-Galerkin method. Two options as the deflection coordinate functions are considered. When calculating, the dead weight of the bar is taken into account. With a total load greater than the Euler load, lateral forces (reactions), touching the pipe wall, appear in the bar. At the end of the article, the formulas for determining the voltage after buckling are presented. The obtained formulas make it possible to determine the critical load of the system for each individual case, taking into account its dead weight and centrifugal forces from the revolving bar. The above-mentioned relations also give an opportunity to determine the reactive moment magnitude from the contact of the revolving bar and the pipe wall.
Approximation method for the characteristics class related to magnetic cleaning quality of reverse waters from ferrous admixtures
Authors: Bulyzhev E M , Menshov E N 
Published: September 2020

Abstract
A method for approximating the aperiodic characteristics class in the category of exponential polynomials has been developed. The advantage of this technique is that even though there is no strict regulation on these polynomials’ structure, it is possible to achieve adequacy with a smaller number of approximating summands and to include the additional systemic information on the technical object (technological process) to the model.
The interaction of high intensity seismic rayleigh and rayleigh – lamb waves with structures
Authors: Ilyashenko A V , Morozov N F , Rashidov T R , Bratov V A , Mardonov B M 
Published: September 2020

Abstract
The arrivals of high intensity seismic Rayleigh and Rayleigh – Lamb waves to the buildings and structures with a relatively large footprint are analysed. The most frequent cases of the foundation structures’ fracture and damage are discussed. The methods for seismic protection from the main types of surface seismic waves, Rayleigh, Rayleigh – Lamb, Love and some more peculiar evanescent (head) waves are considered. The analytical and numerical methods for modelling interaction of building structures with these types of surface seismic waves are analysed. The comparative analysis of the wave dynamic method and the methods based on the spectral decomposition is given.
The study on the magnetic separation efficiency of the reverse water technological liquids from scales in industrial production. Part 1. The problems’ analysis and solutions
Authors: Bulyzhev E M , Menshov E N 
Published: September 2020

Abstract
The causes leading to the technological equipment contamination of for rolling mills and consequently the environment are analyzed. The prospects of using the magnetic separators are substantiated. In order to reduce water consumption to a minimum by rolling production and to reduce the emissions of scale with oil products on its surface into a water body by ten times, high-quality treatment of reversed waterby permanent magnet separators with a fineness of 1–2 mkm is required. The mathematical modeling methods of the quality characteristics separation for monodisperse and polydisperse aqueous ferromagnetic suspensions are considered. It is shown that the required refinement can be achieved in multi-row magnetic separators.
The study on the magnetic separation efficiency of the reverse water technological liquids from scales in industrial production. Part 3. improving the magnetic separation technology
Authors: Menshov E N 
Published: September 2020

Abstract
The magnetic coagulation process mechanism features occurring in magnetic separators are disclosed. Magnetic coagulation occurs only at the threshold concentrations of ferro-particles in aqueous ferromagnetic suspensions. The basis of convergence (aggregation) mechanism of ferro-particles in a gradient external field is the difference in the ferro-particles’ speed with different masses. Based on mathematical modeling, it was found that during coagulation, the residual concentrations of ferro-impurities cannot exceed certain limit values, and mathematical expressions are obtained for calculating the distributions of the dispersed composition of aggregated particles. The combination of optimization procedures for the magnetic separators’ geometric parameters and the cleaning characteristics taking into account magnetic coagulation makes it possible to ensure the high levels of cleaning efficiency of finely dispersed ferromagnetic suspensions while reducing the cost of magnetic separators up to two times at the design stage.
Numerical methods for determining the stressed-deformed state of the electric transmission lines supports
Authors: Sabitov L S , Maylyan L R , Ziganshin A D , Gatiyatov I Z 
Published: September 2020

Abstract
The study examines the influence of the docking nodes reinforcement geometric, mechanical and structural parameters on the stress-strain state of the overhead power lines supports structure taking into account the supports concreted base interaction with the surrounding soil. The steel supports of the overhead power lines, which are thin-walled shell-rods of a closed profile, are modeled by the finite elements of the Tymoshenko-type shell. The concrete base of the support and the surrounding soil are sampled by three-dimensional finite elements of a continuous medium with the corresponding physical and mechanical properties. The influence of the kinematic conditions options for securing the support and taking into account the contact interaction of the concrete support and soil on the VAT design calculation is studied. A methodology for calculating the structures of steel supports and their docking catches was implemented as a part of the ANSYS 14.5 numerical simulation software package. Based on the proposed methodology, a computational experiment was conducted, during which the analysis of the stress-strain state of the overhead power transmission towers fixed in the ground for various types of the docking nodes reinforcement.
The generalized load statistical parameters’ assessment on the building structures
Authors: Pshenichkina V A , Glukhov A V , Gritsenko B S , Sidorova N Yu 
Published: September 2020

Abstract
The distribution laws’ composition of the permanent, long-term temporary, snow and wind loads acting on the structure of buildings and structures is estimated. The following load distribution laws are respectively adopted: normal, logarithmically normal, Gumbel and Weibull. The calculation of the four main central statistical moments was carried out, the approximate distribution law for the generalized load was established by the expansion method in a Gram-Charlier series, as well as the magnitude of its statistical variability. The characteristics of the load variability are compared with the approximate solution of A.N. Dobromyslov. The results obtained are intended for the practical solution of the problems of assessing the safety and residual life of buildings and structures using the reliability theory methods.
On the heterogeneous rock mass stress condition at the unsteady temperature condition
Authors: Frolova I I 
Published: September 2020

Abstract
The unsteady thermoelastic problem of the rock mass stress state in the vicinity of a spherical cavity in the temperature field presence is considered. The temperature field around the cavity, partially filled with coolant, is calculated by the explicit difference scheme. Such tasks arise during the creation and operation of the underground cavities for the various products’ long-term storage. Moreover, the tendency to self-heating of the stored substances leads to the appearance of high-temperature fields, which in turn can cause the significant temperature stresses’ occurrence. A feature of the work is to take into account the two-dimensional heterogeneity of the massif material, which is due to both the fracture of the rock and the dependence of the deformation characteristics on temperature. In the article, the problem of thermo-elasticity is solved as quasi-stationary. Obtaining analytical solutions in the problems of thermo-elasticity of inhomogeneous bodies is associated with great difficulties. Such solutions are obtained, as a rule, for the case of one-dimensional heterogeneity of an object’s material. The obtained temperature field was used to solve the problem of determining the stress state of the array, and the finite element method was used. The results obtained indicate the need for calculations and design of underground cavities to take into account the real properties of the rock mass materials, as well as their change under the influence of various physical processes.
Optimization of steel frames with the choice of materials’ grades with restrictions on general and local stability, strength and stiffness
Authors: Serpik I N , Averin A S 
Published: September 2020

AbstractA computational scheme for the optimal design of steel flat frames made of thin-walled rods with closed cross sections has been developed. The structural elements’ total cost is minimized by searching for the materials’ grades and the rods’ cross sections sizes on the variable parameters’ discrete sets. The rods are separately grouped according to the condition of using one steel grade and the criterion for the cross sections’ identity. Active restrictions on the overall structural system’s stability, local stability of the rods’ walls, strength and stiffness are taken into account. The optimization process using a genetic algorithm using a mixed approach to the mutation procedure, a selection option that provides the inoperative design options, and a single-point crossing-over procedure for the simple exclusions from consideration is implemented. The deformable object stress-strain state analysis is carried out on the rod finite element model’s basis. The assessment of ensuring overall stability is carried out by checking the positive definiteness of the tangent stiffness matrix of a finite element system. Local stability using an analytical relationship for rectangular plates, generally subjected to compression-tension and bending in their plane is confirmed. The results of optimization of a three-span frame made of square pipes are presented. Steel grades and profiles were selected for the groups of the structural system’s rods.
The shear span influence on the crack formation and fracture features in the experimental samples in the external conditions of composite reinforcement presence or absence
Authors: Shilov A A , Shilov P A , Shilov A V 
Published: September 2020

Abstract
The results of the cracking and fracture process investigations in the inclined sections of the reinforced concrete beams, in the conditions of reinforcement presence or absence in the supporting areas with the triangular U-shaped carbon fiber clamps, are presented. The impact of a slice span of 1.5h0, 2.0h0 and 2.5h0 is estimated, as well as the presence of composite reinforcement, on the inclined cracks’ formation and development features.
Determination of the snow cover weight and altitude coefficient values in mountainous and poorly studied areas for assessing loads on buildings and structures
Authors: Adzhiev A Kh , Bekkiev M Yu , Kondratyeva N V , Yurchenko N V 
Published: September 2020

Abstract
The materials use in structures and calculations for buildings and structures in Russia is determined, inter alia, by the normative loads of snow cover on the construction site. An urgent task is to determine its significance for the unexplored areas. The results of determining the normative value of the snow cover weight and changes with the height of the snow weight terrain for the designed objects of the “Udokan” Mining and Metallurgical Combine at the altitudes from 600 to 2000 m are presented. To determine the estimated snow load on buildings and structures in the territory of the facility creation, we used the series of the water supply annual maximums in the snow cover obtained as a result of the snow-measuring route observations at high-altitude weather stations located close to the designed objects. Based on the data of weather stations, a regression linear model of the water supply dependence in the snow cover on the height above the sea level was built. The main calculation method for finding the coefficients of a linear equation is the least squares method. It was revealed that with an increase in the height above the sea level by 1 m, the water supply in the snow cover increases by about 0.1 mm.
Energy-efficient double-row masonry of the exterior walls in the buildings made of cellular concrete blocks
Authors: Suleymanova L A , Pogorelova I A , Marushko M V , Ryabchevsky I S 
Published: September 2020

Abstract
Ensuring the increased requirements for heat saving, environmental safety and comfort of residential and public buildings is one of the main directions of scientific and technological progress in construction. In particular, the cellular concrete products’ use in building envelopes is aimed at solving these problems. Cellular concrete blocks perform the wall-forming material functions and insulation simultaneously due to their thermophysical and strength characteristics. However, the factor reducing the energy efficiency of aerated concrete masonry is the filling of masonry joints with adhesive or cement-sand mortar, which are the thermometer bridges, and the use of polyurethane adhesive, which has lower thermal conductivity compared to adhesive mixtures, as an aggregate of vertical and horizontal joints is unacceptable due to its high deformability and low shear stiffness. The authors examined the systems of building envelopes made of cellular concrete blocks used in civil engineering, and identified their shortcomings that affect the energy efficiency of the entire building. The authors have developed an energy-efficient two-row masonry of cellular concrete blocks, the device of which allows to reduce the masonry thickness and facilitate the installation of the enclosing structure with equal masonry thermal conductivity.
The effect of a polymer material coating on the stress state of plate building structures with holes
Authors: Koryagin S I , Velikanov N L , Sharkov O V 
Published: September 2020

Abstract
Polymeric materials, in particular reinforced coatings, are widely used for the repair of worn and damaged plate building components of various types. Coatings made of polymeric materials not only increase the plate components’ thickness and smooth out the surface roughness, but also provide a reduction in stresses in the region of existing holes or perforations. The article presents a calculation technique that allows to increase the accuracy and reliability of determining the ability of coatings made of polymer materials to reduce stress concentration. Mathematical models for determining the stress state parameters of a plate building component with holes covered with a polymer material are obtained. The calculations confirmed that the use of polymeric materials as a coating reduces the normal and tangential stresses arising at the edge of the hole.
Strength of the monolithic coverings with non-fixable formwork of steel fibro-tuffcrete elements
Authors: Khasauov Yu M , Atabieva M M , Chochuev A A 
Published: September 2020

Abstract
The article presents the strength study results of the tuffcrete flexible monolithic structures with fixed formwork, combined reinforced rods and fibers. The nature and degree of the fibers percentage influence in the tuffcrete element of the fixed formwork, the dimensions of the fixed formwork elements’ fiber-reinforced section and the strength of monolithic tuffcrete on the normal strength to the longitudinal axis of the monolithic combined-reinforced bending floor structures, as well as on the adhesion strength of the fixed form contact line with concrete monolithic, are analyzed. The experimental dependences that make it possible to more economically design the structures under consideration, taking into account the strength and quantity parameters, as well as the geometric dimensions of their individual components, are proposed.
The antenna mast reconstruction structure’s technical support
Authors: Fil O A 
Published: September 2020

Abstract
The article is devoted to technical support of engineering surveys and design during the structures’ construction. Technical support aims to develop and implement the new research methods to obtain the most accurate and reliable data. The author considers the tower of NSC JSC as an example for the possibility of installing the additional equipment for the BS 66487 “New Dzheguta” base station. The design indicators’ determination was carried out using the Selena computer program, which made it possible to get the structure’s actual performance in a short time, excluding the fairly old methods of examining the construction sites, to facilitate the work and reduce the time spent on diagnosis at the same time.
The influence analysis of the structures and applied software systems’ soil foundations design models
Authors: Khashirova T Yu , Olgarenko I V , Kozhenko N V 
Published: September 2020

Abstract
In difficult engineering and geological conditions, the water-supporting elevated structure’s design is carried out taking into account the base soil model, as well as the correctly selected software package, which allows to determine the stress-strain state (SSS) of the structure and as a result, all structural and technological parameters qualitatively.
The results of determining the structural elements’ displacements when using various soil models and software systems
Authors: Degtyareva O G , Vasiliev S M 
Published: September 2020

Abstract
Taking into account the nonlinearity of the structures base soil work of the of the of during geotechnical calculation makes it possible to adequately determine the stress-strain state (SSS) of structural elements and, in general, the base - foundation - structure system.
Assessment of the damage impact to particular water structures on their performance
Authors: Olgarenko V I , Khashirova T Yu , Kozhenko N V 
Published: September 2020

Abstract
Identifying the type of damage in which the structure’s performance is not ensured is one of the most critical tasks in assessing the structures’ performance. The necessity of assessing the structure’s behavior for operability in the base - foundation - elevated system is proved.
The base soil local sagging zones’ influence assessment on the water retaining structure’s operability
Authors: Degtyareva O G , Vasiliev S M 
Published: September 2020

Abstract
The base modeling using the elastic-ideal-plastic Mora-Coulomb model made it possible to evaluate the vertical displacements in the presence and absence of local subsidence. It was established that the influence of local sagging in the second and third zones does not significantly affect the vertical displacements recorded on the pile grillage’s surface.
Assessment of the hydraulic structures’ technical condition by means of the amplitude-frequency characteristics’ analysis
Authors: Degtyarev G V , Abdrazakov F K , Lavrov N P 
Published: September 2020

Abstract
Based on the numerical simulation of the structure, a decrease in the frequency was revealed with an increase in the number of defective sections. A change in the deformed oscillation pattern at the corresponding frequencies is observed. The method clearly makes it possible to increase the hydraulic structures’ efficiency.
Possibilities of a dynamic survey method for hydraulic structures
Authors: Degtyarev V G , Degtyarev G V 
Published: September 2020

Abstract
Establishing the category of a hydraulic structure’s technical condition is an urgent task that constantly requires solutions during operation. Both the operating costs and the safe operation will largely depend on the choice of a survey method and its reliability and validity. The method of structural dynamic diagnostics, which is becoming more widespread, is promising and relevant, however, based on the relative novelty of the method, its application requires closer attention, including consideration from the standpoint of numerical modeling.
Oscillations of the variable cross beams under seismic and technogenic influences (part II)
Authors: Kulterbaev Kh P , Baragunova L A , Shogenova M M , Bulanov S G 
Published: September 2020

Abstract
The forced transverse oscillations of the variable cross section compressed beams under seismic and technogenic impacts are considered. The source of oscillations is the kinematic perturbations of the beam ends in the form of a harmonic or random vector process. The mathematical model of oscillations is presented as a boundary value problem from the basic partial differential equation of the fourth order hyperbolic type in spatial coordinate and the second order in time, which is supplemented by the boundary conditions. The beam fluctuations are interpreted as the spatiotemporal random fields inhomogeneous in space and stationery in time. In the deterministic case, the amplitudes of the forced oscillations are determined, the influence of the kinematic disturbances’ frequency and the beam oscillations’ shift of their phases is studied. In the stochastic problem, the standard deviations for the deflections are calculated, the influence of the characteristic frequency and correlation of the components of the vector perturbation process on the deflections’ output function is studied. The problem is solved by the methods of the variables’ separation, finite differences and the theory of random processes. The examples are considered, the conclusions are drawn from the calculations results in the Matlab computing complex environment.
Parametric research of the two-layered grouted shells’ bearing strength
Authors: Zhurtov A V , Bashiev A M , Dzhandigov U A , Mazikhov R V 
Published: September 2020

Abstract
The results of the two-layer reinforced cement shells’ bearing strength parametric study under the temperature and power effects of a standard fire are presented. The influence and the magnitude dependence plots of the power load, concrete class and the thickness of the shell layers on the structure’s bearing strength are revealed. The optimal thicknesses of the structural and protective layers of the shell, as well as the cement-cement layer concrete grade, are determined.