bluuebunny/crossref_metadata_2025_split huggingface dataset:
Absorbers impact on the reliability of structures subjected to random vibrations
Authors: Podwórna M , Grosel J , Śniady P 
Published: February 2021

Abstract
The paper considers the problem of optimizing the absorber parameters when random vibrations of the structure create a filtered Poisson process. A new parameter optimization criterion was proposed, consisting in minimizing the probability of the maximum vibrations of the structure exceeding a certain permissible value of displacements. This criterion means maximizing the reliability of the vibrating structure with regard to the maximum vibration amplitudes.
Third formulation of the space-time finite element method
Authors: Kacprzyk Z 
Published: February 2021

Abstract
The paper explains differences existing between the space-time finite elements, which fundamentals were presented by the Kączkowski in 1975 and 1976, and its modification. The replacement of load with concentrated forces and moments (which are to satisfy equilibrium conditions at nodes) was given up, namely in the latter one; instead, a requirement was made that functions approximating the solution would satisfy differential equation in inter-node areas in a specified integral way. This leads to a system of algebraic equations, in which kinematic parameters existing in the solution approximating functions are the unknowns. Displacements and their derivatives (of any order) at nodes are those parameters.
Dynamic and static response of a slightly compressible hyperelastic solid
Authors: Franus A , Marek A 
Published: February 2021

Abstract
The paper presents dynamic and static response of a slightly compressible hyperelastic solid. Material models under consideration are obtained by extending incompressible material models which are consistent second and third order approximation of existing stored energy function in terms of a deformation measure, namely MCMV and MCIZ. The problems of a uniaxial compression of a rod and a twisting column are solved using ABAQUS which is a powerful finite element program designed for general use in nonlinear problems. The models are defined with a help of user subroutine UHYPER. In the case of including dynamic effects, an implicit integration scheme available in the software is used. For the twisting column problem, results are compared against available in the ABAQUS library polynomial model where the volumetric stored energy function does not meet basic growth conditions. Experimental data on synthetic rubber neoprene published in the literature is utilized.
Modern lightweight deployable engineering structures
Authors: Al Sabouni-Zawadzka A , Zawadzki A , Gilewski W 
Published: February 2021

Abstract
The paper concerns the formulations and areas of possible scientific research in the field of modern deployable structures. The key problem is to provide a precise definition of modern deployable structures and to define the inherent properties that such structures should have. The objective was accomplished by specifying how the words deployable and lightweight are understood and assigning the constructions the necessary smart features. The defined features are fulfilled by tensegrity structures whose characteristics, from the point of view of deployability, are given in the paper.
The associated non-stationary thermal elasticity problem for a two-layer plate
Authors: Shlyakhin D A , Kusaeva Zh M 
Published: February 2021

Abstract
A new analytical solution of a non-stationary thermal elasticity problem for a rigidly fixed round two-layer plate was constructed. The case of temperature change on its upper face surface is considered and the heat exchange of the lower face surface with the environment is taken into account. When constructing a General solution, the mathematical apparatus for separating variables in the form of finite integral Fourier–Bessel transformations and generalized biorthogonal transformation is used. The solution peculiarity is the application of control and measuring device. The calculated relations make it possible to determine the stress-strain state and the distribution nature of the temperature field in a rigid round two-layer plate under any external temperature influence.
Related thermoelastic elastomeric task for cylinder
Authors: Shlyakhin D A , Kalmova M A 
Published: February 2021

Abstract
A new closed solution of the coupled non-stationary problem of thermoelectroelasticity for a long piezoceramic radially polarized cylinder is constructed when the boundary conditions of the 1st kind of thermal conductivity are satisfied on its front surfaces. The case is considered when the rate of change of the temperature field does not affect the inertial characteristics of the elastic system, which makes it possible to include in the initial calculated relations of the problem under consideration the linear equations of equilibrium, electrostatics and thermal conductivity with respect to the radial component of the displacement vector, electric potential, as well as the function of changing the temperature field. The calculations use the classical Fourier law of thermal conductivity. To solve the problem, the mathematical apparatus of incomplete separation of variables is used in the form of a generalized biorthogonal finite integral transformation (KIP), based on a multicomponent relation of eigenvector-functions of two homogeneous boundary value problems. An important point in the procedure of the structural algorithm of this method is the selection of the adjoint operator, without which it is impossible to solve non-self-adjoint linear problems of mathematical physics.
Parametric study of the stress state of beams with round holes in pure bending
Authors: Saiyan S , Paushkin A 
Published: February 2021

Abstract
A parametric study of the stress state of a rectangular cross-section beam with round holes in pure bending is performed by the finite element method implemented in the ANSYS Mechanical APDL software package. Correction coefficients were obtained for normal stresses determined by strength of materials methods. The coefficients of stress concentration during bending were determined depending on the size of the holes, as well as the distance between them. The research results obtained can be used in practical problems of designing perforated beams.
Numerical study of the stress-strain state of the vertical four-compartment cylindrical tank
Authors: Saiyan S , Paushkin A 
Published: February 2021

Abstract
A numerical study of the stress-strain state of the construction of the vertical four-compartment cylindrical tank at the stage of operation for storing various substances has been carried out. The purpose of the finite element calculation is to determine the optimal value of the thickness of its load-bearing walls and partitions, which ensure the mechanical safety of the construction under different modes of filling the containers. The reliability of the calculation results, which are carried out both in linear and geometrically nonlinear formulations, is provided by calculations in two software packages SCAD and ANSYS Mechanical APDL with comparison of solutions.
Stress-stain state in elastic spherical shells under the action some asymmetrical of circular loads
Authors: Astakhova A 
Published: February 2021

Abstract
The paper presents the basic differential equations for calculating shells of rotation. It is considered that the material of the shell works beyond the elastic limit. The conclusion of the resolving system of differential equations is based on the linear shell theory and the Kirchhoff-Love hypothesis. The physical correlations are based on the small elastic-plastic deformation theory. With the construction of the solution of the load function, also unknown resolving functions expand to the Fourier series along the circumferential coordinate. In the present work, the action of the asymmetrical distribution along the parallel loads is considered. The solution is approached by the elastic decisions method. The study of stress-stain state in the isotropic spherical shells is presented in the work. The results of the calculation are presented in the example of a spherical shell. The work of the material beyond the elastic limit is taken into account using assuming linear hardening of the material. The shell is loaded with ring distributed loads, and they are applied on a certain segment in a parallel circle. The diagrams of bending moments and areas of the appearance of plastic deformations along the thickness of the shell are presented. The areas of plastic deformations for ring loads distributed along the parallel relative to the zero meridian in the range of 45, 90,135 degrees are shown.
Plate tensegrity structures controlled with self-stress
Authors: Martyniuk-Sienkiewicz K , Al Sabouni-Zawadzka A 
Published: February 2021

Abstract
The present paper focuses on the analysis of plate tensegrity structures based on the 3-strut simplex module. Two structural systems are considered: a single plate tensegrity module and a multi-module segment. It is proved that the implementation of plate elements in the basic tensegrity module not only opens new application perspectives, but also increases its stiffness. The analyses are performed with the use of the finite element method (FEM), using the second order theory and the geometrically nonlinear analysis.
Results of the study of vibrations of concrete structures of the hydropower plant building
Authors: Evdokimov S V , Seliverstov V A , Orlova A A 
Published: February 2021

Abstract
The paper considers the results of studying vibrations of certain components of the hydropower plant building and their influence on the structure of the building as a whole. Vibration loads on various elements of the hydropower plant building which can cause damage to the building, thereby reducing the operational reliability of the whole structure and doing potential harm to the environment and human life support, is analyzed. The necessity for vibration monitoring of structures which should be conducted constantly or periodically to determine the present condition of structures is reasoned. Vibrations of the section concrete parts and vibrations of hydroelectric power plant units are considered. To detect the vibrational movements of the section as a solid body on an elastic base Section № 2of the hydropower plant building has been chosen. The recording of vibrations has been conducted for all three components: Z (vertical), H II (horizontal, parallel to the flow) and H ⊥ (horizontal, perpendicular to the flow) and the obtained data are given in this paper. The intervals of observed and dominant periods of vibrations are estimated. The research provides the data on amplitudes and accelerations of vibrations, as well as on the maximum recorded peak-to-peak swing. Based on the analysis of the received vibrograms, it is stated that the recorded vibrations are non-periodic and have a relatively narrow range of periods. In conclusion it is underlined that in order to determine the maximum possible amplitudes of section vibrations as well as to calculate the corresponding dynamic stresses in ceiling trusses it is necessary to observe vibrations when hydraulic units are operated simultaneously and the flow passes through the fully open bottom spillways of the inspected section.
To the optimization model of flexible reinforced concrete elements in monolithic frames of buildings
Authors: Tamrazyan A G 
Published: February 2021

Abstract
This article examines a three-span 8-storey frame building with the aim of optimizing the girders based on heuristic algorithms. A comparative analysis of modern heuristic algorithms for optimizing bending elements as applied to reinforced concrete frames of monolithic multi-storey buildings for the possibility of their use in practical engineering calculations. A mathematical model of the adapted algorithm has been formed that meets the requirements of Russian standards. The target function for cost has been determined, including the cost of materials (concrete and reinforcement), formwork, construction with the corresponding rise in price coefficients. In this case, the girder is optimized, since, despite the fact that their number in the building frame is 24, the cost is about 65% of the total cost, including reinforced concrete columns in the amount of 32.5 constant parameters and 19 variable parameters are selected, a set of limitations of the optimization algorithm was developed, including regulatory requirements for the calculation of limit states, design requirements for the reinforcement of the girder and its geometric characteristics, including the concrete cover, the step of the rods, anchoring, etc. The calculation of girders as part of a reinforced concrete monolithic frame of an 8-storey building was carried out using the developed methodology and the comparison of the results obtained with numerical calculations and solutions obtained by other methods. It is shown that the results of numerical calculations have a sufficiently high efficiency of the developed optimization technique. The final cost is after 100.000 iterations. Savings in terms of the main design characteristics range from 3 to 13%, depending on the complexity of the problem and the accepted constraints.
Investigation of the humidity regime of multilayer enclosing structures of buildings and structures
Authors: Vytchikov Yu S , Saparev M E , Kostuganov A B 
Published: February 2021

Abstract
The article describes an approximate analytical method for calculating the moisture regime of multilayer building envelope structures. The novelty of the proposed method lies in the use an analytical dependence for determination the position of the flatness possible condensation, obtained as a result of studying the function which is the difference between the partial pressures of water vapor in the considered section the enclosing structure and the partial pressure of saturated water vapor at the extremum. The article presents the results of calculating the moisture regime of the outer wall of a residential building under construction in Samara using monolithic sandless expanded clay blocks with a density equal to 600 kg/m3. The calculation showed that during the heating period the coordinate of flatness of possible condensation in sandless expanded clay concrete, measured from the inner surface of the wall moves from 0.444 m to 0.5 m. The made assessment of moisture accumulation in the considered outer wall, both for the annual period of operation of the building, and for the period of months with negative temperatures, showed compliance with the regulatory requirements for heated rooms.
Degradation of wooden products used in non-ventilated flat roofs
Authors: Juras P 
Published: February 2021

Abstract
In the recent years, the amount of flat roofs with load bearing structure from wood in Slovakia increases. This is caused by the costs and the effort to maximize the speed of built. Using the wood rafter in the flat roofs cause problem of using an organic material between two vapor tight layers, from interior a vapor barrier and from outside the roofing membrane. Additional, also oriented strand boards are also used instead of wooden boards. These are used either in condensations zones of the roofs or direct under the roofing membrane. This creates degradation of the material because of use in the humid environment in very short time. This paper briefly describes the state-of-art situation in Slovakia with some examples from the buildings and the numerical evaluation of the problem.
Accumulation of damage in reinforced concrete elements under cyclic loads
Authors: Mkrtychev O , Lokhova E 
Published: February 2021

Abstract
The article presents the results of research on the behavior of a frame structure in a reinforced concrete building with a full rigid frame under cyclic load typical for strong earthquakes. When creating a finite element model for the research, the models of materials were used that take into account the nonlinear nature of the structure behavior, as well as the accumulation of damage under cyclic loads. The calculation was carried out by a direct dynamic method using explicit schemes for integrating the equations of motion in the multipurpose finite element software package LS-DYNA.
Theoretical-experimental analysis of selected passive timber house wall
Authors: Michálková D , Ďurica P 
Published: February 2021

Abstract
The advancing times and legislation require constant research of new progressive building envelope structures. Walls based on wooden material are perspective in this regard. These are capable of elimination the wall thickness while providing the required thermal resistance. The pavilion research of KPSU UNIZA laboratory includes this kind of wall structures intended for passive wooden houses. This paper deals with one of the researched wall assemblies in the annual operation. The measurements show that such a construction is suitable for near to zero energy buildings. It also points out that the correct design can eliminate thermal bridges in the area of the load-bearing wooden studs.
Identification of the collapse of the load-bearing facade cladding system of a building
Authors: Papán D , Papánová Z , Ščotka M 
Published: February 2021

Abstract
The aim of paper is to show how one structural fail can cause collapse of cladding system. This cladding system was one of most popular for use about 40 years ago for civic amenities buildings. The simplified theoretical approach for the collapse system reason is verified by modern FEM calculation. The results of investigation contain in situ inspections and measures on specimens. The main result of research is to amplify interest to older facades and its maintained and inspections.
Experimental studies of wind impact on religious buildings
Authors: Poddaeva O I , Fedosova A N , Gribach J S 
Published: February 2021

Abstract
This article is devoted to the description of experimental studies of wind impact on a religious temple in compliance with religious purposes. Studies of aerodynamic characteristics should be carried out using experimental methods for each Orthodox church individually. In the first chapter, the authors describe the specifics of the design of religious buildings, in the type of design of Orthodox churches. In the second chapter, brief information on the conduct of experimental studies of wind impact on the basis of NRU MGSU is launched. In the third chapter, a description of the experimental study of the wind effect on the Orthodox church, created in the Moscow region. Conclusions regarding this study.
Interaction of compressible barrette with surrounding soil and raft
Authors: Ter-Martirosyan Z G , Hung Dam Huu 
Published: February 2021

Abstract
The statement and analytical solution are handled simultaneously with the comparison with the results gained by the numerical method for addressing the problem of quantifying the stress-strain state (SSS) of a multi-layer soil cell consisting of a barrette interacting with the raft-plate. The solution to the assigned problem is considered by the authors for two cases, without and taking into account the compressibility of the underlying soil layer. In the first case, when the underlying soil layer is non-compressive, the formulas are formed in order to determine the SSS in the body of the barrette with the surrounding soil and the equivalent deformation modulus of the barrette-raft-surrounding soil system, so that engineers can absolutely estimate the bearing capacity of the underlying soil under the heel of barrettes. The second case, when the compressibility of the underlying soil layer is taken into account, the solution to the assigned problem is found by means of establishing and solving differential equations of the second order. As a result of the approach above, the formulas for determining the SSS in the body of the barrette are confirmed and the formulas for estimating the settlement of the raft and the equivalent deformation modulus for the barrette-raft-surrounding soil system are obtained. It is noted that taking into account the downward movement of the compressible barrette into the underlying soil layer lead to the decrease in the equivalent deformation modulus of the system.
Predicting the settlement of foundation bases taking into account induced anisotropy
Authors: Ter-Martirosyan Z G , Ter-Martirosyan A Z , Luzin I N 
Published: February 2021

Abstract
This article is devoted to the quantitative assessment of the stress-strain state of finite width foundations, taking into account their induced anisotropy. The article discusses the stress-strain state of a homogeneous base, which acquires the property of deformation inhomogeneity E(x, y, z) under the influence of an external load, due in the general case to a nonlinear dependence of stresses and deformations of the form εm
= σ
m
/K(σ
m
, τ
i
) and γi
= τ
i
/G(σ
m
, τ
i
), where εm
and γi
are volume and shear deformations, and σ
m
are τ
i
the average stress and intensity of shear stresses at each point of the base, K and G are modules of volume and shear deformation. As an example, we consider the stress-strain state of the foundation under the influence of a distributed load p=const along the strip b= 2a (plane deformation). To calculate the settlement with a nonlinear dependences εm
– σ
m
and γi
– τ
i
, it is proposed to use the experimental curves K – σ
m
and G – τ
i
. For the case of the absence of deformation inhomogeneity, when K and G are constant, an analytical solution of the problem is given for the vertical line x=0 under conditions of compression. For this case, a closed solution is obtained, according to which the settlement depends nonlinearly on the width of the loading band b=2a.
Numerical modeling of freezing of structural objects in transition zones of railways
Authors: Hodás S , Pultznerová A 
Published: February 2021

Abstract
The structure of the transition zone of the railway formation is composed of layered materials built into it, which must be resistant to adverse winter climatic conditions characteristic for the region. Among the most dangerous factors is the freezing of these materials and therefore the increased resistance to freezing in winter period is required. By this damage, change of their internal structures and material-technical characteristics can occur. For example, as a consequence of freezing, the structure may be affected by the consequent reduction of resistance of these layers to traffic load (axle loads, deformation modules of the individual layers, etc.). Special construction structures are also designed in the track and the paper is dedicated to transition zone, i.e. reinforced concrete tub as an intermediate element in changing the types of railway formation (the area between the slab track and the continuous track bed). In the experiments using the numerical models, the depth of freezing of the structural objects in the transition zones of the tracks is analyzed, i.e. the zero isotherm height position for 0 °C in the railway structure is determined and compared with respect to the bottom surface of the concrete tub as well as the FPL (frost protection layer) in the continuous track bed, subsequently the design of the objects may be modified.
Preliminary results of geodetic diagnostics of transition areas of ballastless track
Authors: Ižvoltová J , Chromčák J , Pisca P 
Published: February 2021

AbstractConstruction of ballastless track is usually used in high-speed railway, which is suffered by high traffic load. The main reason is to reduce the maintenance costs of the railway line, although the initial costs of its construction are incomparably higher than with the classic construction. From the point of view of long term deformation analysis of railway track, the critical point of such the type of the construction seems to be the place of its completion and transition to the classical the railway superstructure. In terms of dynamic effects, it is a place with a change in stiffness and therefore a special attention is paid to its diagnostics.