International Journal for Computational Civil and Structural Engineering

Journal Information
ISSN / EISSN : 2587-9618 / 2588-0195
Published by: Publishing House ASV (Izdatelstvo ASV) (10.22337)
Total articles ≅ 278
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Анатолий Бедов, Ruslan Vagapov, Azat Gabitov, Alexander Salov
International Journal for Computational Civil and Structural Engineering, Volume 18, pp 92-98; https://doi.org/10.22337/2587-9618-2022-18-1-92-98

Abstract:
A unified approach in solving equilibrium problems of standard cells of membrane structures made of various absolutely flexible materials, including anisotropic (orthotropic) materials is presented in this paper. The objects of study are rectangular membranes under various conditions of fixing and/or supporting. The problems were considered in a geometrically nonlinear formulation, with the deformations and the squares of the rotation angles thereunder being considered to be comparable with each other, but small compared to unity. A resolving system of differential equations in partial derivatives written in displacements is obtained therewith. These equations combining with the presented boundary conditions are numerical models of a number of fragments of real membrane structures. The closed nonlinear system of equations was integrated using the discrete braking method. Therewith both longitudinal and transverse vibrations of anisotropic masses were analyzed using a conditional dynamic model to select the initial values of the displacements. The problem of equilibrium of a square isotropic membrane with a free boundary under a uniformly distributed load is presented as an example. The resulting graphs and tables show the distribution of forces and displacements. They may be used for calculating membrane structures. The developed technique may be applied to those values of the initial parameters under which the calculations have not yet been made.
Andrej Reshetov, Ekaterina Lokhova
International Journal for Computational Civil and Structural Engineering, Volume 18, pp 82-91; https://doi.org/10.22337/2587-9618-2022-18-1-82-91

Abstract:
The urgent task of earthquake-resistant construction is to improve the methods of calculating the seismic effect. Currently, most calculations for seismic effects are made taking into account only the translational components of the earthquake. However, seismic soil rotations make a tangible contribution to the dynamic response of structures that are sensitive to the wave effect of seismic impact. Modern studies show that building structures have a spatial nature of work, and in calculations for seismic loads, in addition to three translational components, it is necessary to consider the impact on buildings and structures from additional three rotational components. The purpose of this work is to assess the influence of rotational components on the stress-strain state of a multielement reinforced concrete building. In the course of the work, calculations of a reinforced concrete building were made without taking into account and taking into account the rotational components of the seismic impact, based on the results of which a comparative analysis was made. The calculation for the earth-quake was performed by an explicit direct dynamic method of central differences in the LS-DYNA software in six settings: the action of the translational component is set along the X axis; the action of the translational com-ponent is set along the X axis and rotational component – relative to the Y axis; the action of the translational component is set along the Y axis; the action of the translational component is set along the Y axis and rotational component – relative to the X axis; the impact of three translational components; the action of three translational and three rotational components. As a result of a comparative analysis of the obtained displacements and stresses, it was concluded that taking into account rotational components does not make a tangible contribution to the SSS of the building under consideration.
Надежда Никифорова, Артем Коннов
International Journal for Computational Civil and Structural Engineering, Volume 18, pp 141-150; https://doi.org/10.22337/2587-9618-2022-18-1-141-150

Abstract:
В настоящее время по причине глобального потепления климата происходит деградация вечной мерзлоты. Усиливается деструктивное воздействие криогенных процессов на здания и сооружения в криолитозоне. Целью данной работы являлось прогнозирование в связи с изменением климата снижения несущей способности свайных фундаментов существующих зданий и вызванных этим деформаций основания из многолетнемерзлых грунтов. Были проведены численные исследования несущей способности свайных фундаментов и деформаций основания здания, возведенного в 80-х годах прошлого века в Норильске по I принципу строительства на многолетнемерзлых грунтах. Моделирование показало снижение несущей способности свай здания до 50% за 60 лет (начиная с 2000 г.). Определен срок, по истечении которого здание придет в аварийное состояние. Дана оценка эффективности применения сезонно-действующих охлаждающих устройств для обеспечения его эксплуатационной надежности.
Nikolay Aniskin, Stanislav Sergeev
International Journal for Computational Civil and Structural Engineering, Volume 18, pp 40-50; https://doi.org/10.22337/2587-9618-2022-18-1-40-50

Abstract:
The article discusses the solution to the problem of transient seepage in relation to cases of rapid drawdown or draw-off, which may be caused by technological necessity or an emergency. This paper provides an overview of research and calculation methods for the problem under consideration. Using the PLAXIS software package, a numerical solution of the filtration problem for a homogeneous soil dam with a drainage prism is obtained. This problem has been repeatedly solved using other methods and computational programs. Comparison of the obtained results with those performed earlier by other methods showed their reliability and good comparability. The obtained results of solving the filtration problem at the next stage of the study of the structure operability can be used to assess the filtration strength of the soils of the dam and the stability of the upstream slope.
Vladimir Lalin, Хыу Хиеу Нго
International Journal for Computational Civil and Structural Engineering, Volume 18, pp 72-81; https://doi.org/10.22337/2587-9618-2021-18-1-72-81

Abstract:
This work deals with the loop resultant method applied to linear static response of statically indeterminate rod-systems. The method uses the representation of this system in the form of a union of statically indeterminate loops. An algorithm for construction the flexibility matrix of the system is proposed. The unknowns of a system are the loop resultants. This method is based on the use of compatibility equations of deformations, the general solution of homogeneous equations of equilibrium is obtained by transposition of the compatibility matrix. The advantages of this method are the number and location of zero blocks and non-zero blocks of the system flexibility matrix depend only on the numbering of loops. Application of this method is considered for analysis of structural frame.
Galina Safina
International Journal for Computational Civil and Structural Engineering, Volume 18, pp 129-140; https://doi.org/10.22337/2587-9618-2022-18-1-129-140

Abstract:
Ncient architectural buildings are of great value for all modern humanity. Over time, under the influence of vibrations, water and other man-made and natural factors, the foundations of such buildings are destroyed, the soil structure changes. Currently, one of the most popular methods of strengthening soils and strengthening foundations is the jet grouting technology. When the liquid grout passes through the porous rock, the suspended particles of the grout form a deposit. In this paper, we study a one-dimensional model of suspension deep bed filtration in a porous medium with different particle capture mechanisms. The considered filtration model consists of the balance equation for the masses of suspended and retained particles and the kinetic equation for deposit growth. In this case, the deposit growth rate is determined by the concentration function of suspended particles, which, in turn, depends on the properties of the suspension and the geometry of the porous medium. The solution to the problem is obtained for linear and non-linear concentration functions. An asymptotic solution of the problem is constructed for both types of functions near the concentration front of suspended and retained particles. It is shown that the asymptotic and numerical solutions are close over a long time interval.
Gaik Manuylov, Sergey Kosytsyn, Maxim Begichev
International Journal for Computational Civil and Structural Engineering, Volume 18, pp 109-118; https://doi.org/10.22337/2587-9618-2022-18-1-109-118

Abstract:
Angle bars in compression are quite common in building and transport structures. However, the peculiarities of their behavior during the loss of stability and in supercritical equilibrium have not been sufficiently studied even within the limits of elastic deformations. The paper shows solutions for the stability of symmetric and asymmetric rods with an angle profile. The development of post-critical deformations is shown. The features of the behavior of the rods, obeying the hypotheses of V.Z. Vlasov.
Rashid Mangushev, Nadezhda Nikitina, Le Van Chong, Ivan Tereshchenko
International Journal for Computational Civil and Structural Engineering, Volume 18, pp 119-128; https://doi.org/10.22337/2587-9618-2022-18-1-119-128

Abstract:
The article provides an analysis and comparison of the bearing capacity of barrett piles in difficult geological conditions at a construction site in Hanoi - Vietnam based on the results of analytical calculations using various methods. In particular, it contains calculation results according to Building Code of Russian Federation SP 24.13330.2011 "Pile foundations" [1], by numerical modeling of the pile operation under load using the PLAXIS 3D and MIDAS GTS NX software package, based on the results of field tests with piles (static load method). It is noted that the bearing capacity of bored piles and barret piles, according to the results of full-scale static tests with a limiting settlement of 40 mm, is in good agreement with the numerical solution (with the adopted soil model Hardening Soil (HS)) and with the calculation by the analytical method according to the strength characteristics of the soil base
Алексей Киреенков, Григорий Федотенков, Anton Shiriaev, Sergey Zhavoronok
International Journal for Computational Civil and Structural Engineering, Volume 18, pp 14-23; https://doi.org/10.22337/2587-9618-2022-18-1-14-23

Abstract:
The implementations of the theory of multicomponent dry friction [1-19] for analyze the dynamics of some robotic systems, such as a butterfly robot [16-18, 20] or a humanoid robot is proposed. Since the main controlled element of these systems is a spherical, elastic composite shell, it is required to calculate the distribution of normal contact stresses inside the contact spot. The contact pressure distribution for such elements is constructed using the S. A. Ambartsumyan’s equation for a transversally isotropic spherical shell. This equation is modified by introducing the averaged contact pressure and normal displacements for the shell. The construction of the resolving integral equation for the contact pressure is based on the principle of superposition and the method of Green's functions. For this, the corresponding Green's function is constructed, which is the normal displacement of the shell as a solution to the problem of the effect of concentrated pressure. Green's function as well as the contact pressure, it is sought in the form of series expansions in Legendre polynomials, taking into account additional relations for the reduced contact pressure and normal displacements. Using the Green's function, an integral equation solving the problem is constructed. As a result, the problem is reduced to determining the expansion coefficients in a series of the reduced contact pressure. Restricting ourselves to a finite number of terms in the series of expansions, using the discretization of the contact area and the properties of Legendre polynomials, the problem is reduced to solving a system of algebraic equations for the expansion coefficients for the reduced pressure. After that, from the additional relation, the coefficients of the required expansion of the contact pressure in a series in Legendre polynomials are determined. To describe the conditions of shell contact with the surface, the theory of multicomponent anisotropic dry friction is used, taking into account the combined kinematics of shell motion (simultaneous sliding, rotation and rolling). The coefficients of the dry friction model can be calculated using simple explicit formulas [1-19] based on numerical experiments.
Vladimir Selyaev, Tatyana Nizina, Дмитрий Низин, Nadezhda Kanaeva
International Journal for Computational Civil and Structural Engineering, Volume 18, pp 99-108; https://doi.org/10.22337/2587-9618-2022-18-1-99-108

Abstract:
We present the results analyzing the climatic resistance of epoxy polymers obtained on the basis of a modified Etal-247 resin cured by Etal-45M under the effect of natural climatic factors in a temperate continental climate. The kinetics of damage accumulation in the structure of polymer samples under tensile loads was studied on the basis of the results obtained using the author's method. The essence of the technique was to determine the coordinates of the “critical” points of deformation curves based on the time series fractal analysis methods, recorded with a high readings frequency (0.01 s). To estimate the level of accumulated failures leading to the de-struction of samples under tensile loads, we used a parameter defined as the ratio of the number of points with a fractality index less than 0.5 to the total number of points on deformation curves (until reaching the level of “critical” tensile stresses). Time intervals of 0.16 seconds were studied with analyzed area shifted with a step of 0.01 sec. A specific index is proposed that characterizes the accumulated number of damages in the polymer sample structure per unit of its strength. Its achievement leads to the destruction of the composite under study. We have determined the moisture state effect and climatic aging duration on the damage accumulation kinetics in the polymer sample structure under tensile loads.
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