Experimental Solving the Problem of the Shelter Object Reinforced Concrete Structures Thermal Expansion

Slyusarenko, Yuriy; Tytarenko, Volodymyr; Kosheleva, Nina; Kostochka, Iegor; Shekhovtsov, Vladyslav; Yakovenko, Ihor; Fesenko, Oleg; Vapnichna, Viktoriia; Iskov, Sergii; Kaliukh, Iurii

doi:10.1007/978-3-031-32511-3_173

Cited by 4 publications

(3 citation statements)

References 11 publications

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“…Similar problems of the plane theory of elacticity, plate bending and extended systems are considered in [G. Kapanadze (2003, S. Shavlakadze, G. Kapanadze, A. Gogolauri (2019)] and Ukrainian scientists [16][17][18][19][20][21][22].…”

Section: Problem Statementmentioning

confidence: 99%

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Search for an equal-strength contour inside a viscoelastic rectangle

Kapanadze,

Balavadze,

Kristesiashvili

et al. 2023

esanr

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Irregularity of geometric and physical parameters in thin-walled structures leads to significant concentrations of stresses and creates dangerous zones for the spread of cracks or plastic deformations. Under the influence of a tense state, they are similar to gills. Stress concentration zones in areas of irregularity have a significant impact on the tensile strength and durability of thin-walled structures. Traditional analytical and numerical methods known at this time are less effective in investigating the stress-strain condition of corrugated thin-walled structures. It is, therefore, necessary to develop new effective methods for solving the tasks of this class. Currently, for engineering calculations, there is virtually no comparison of simple and convenient formulas for determining the critical compressive load taking into account the peculiarities of the design. The scientific novelty of the paper is that to achieve the set goal, it will be used for the first time in the general theory developed for the calculation of buildings and structures, known as the "Theory of elasticity in ordinary differential equations." The paper will show that the accuracy of this new theory is adequate to the classical elongation theory and at the same time dramatically simplifies the solution of any problem in the calculation of tiles, which is achieved by converting them to conventional differential equations. The general methods of compiling differential equations, the methods of its simplification, for the calculation of membranes with cross-sectional incisions, and the calculation of plates under conditions of nonlinear deformation are discussed. Methods for solving differential equations with variable and momentum coefficients are specified. An algorithm and a program for the analysis of the stress-strain state of spatial structures and their elements are developed. The practical value of the paper lies in the possibility of using developed methods and programs for the design and construction of buildings, as well as for the stability tasks of slabs with holes, and panels used in construction as typical assembly elements. The given mathematical algorithm and program for specific tasks, which are distinguished by simplicity, can be used by design and research organizations in the calculation and design of plates and membranes.

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Section: Problem Statementmentioning

confidence: 99%

“…Thus, the definition of a conformally mapping function, and thus the definition of the equation of the desired equal-strength contour, is reduced to solving an equation of the Voltaire type (21).…”

Section: Problem Solutionmentioning

confidence: 99%

Search for an equal-strength contour inside a viscoelastic rectangle

Kapanadze,

Balavadze,

Kristesiashvili

et al. 2023

esanr

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“…The Digital Twin (DT) concept is part of the fourth industrial revolution. [1][2][3][4][5][6][7][8][9][10] It is designed to assist enterprises in the faster detection of physical problems, more accurate prediction of their results, and manufacturing betterquality products. 11 The definition of a DT differs between industrial and scientific sources.…”

Section: Introductionmentioning

confidence: 99%

The digital twin use for modeling the multi‐storey building response to seismic impacts

Marienkov,

Kaliukh,

Trofymchuk

2024

Structural Concrete

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This work is dedicated to theoretical and experimental research on constructing a digital twin for a 24‐story building located in a seismic zone with the possibility of seismic vibrations of up to eight on the Richter scale. A digital model of the building was developed considering the changes in its geometry (damage or absence of structural elements). This requires detailed field inspections of partially constructed buildings and consideration of the inspection results when constructing a digital model. The boundary conditions, in addition to the geometric characteristics of the building, include the physical and mechanical characteristics of all its structural elements obtained through nondestructive testing methods. Discrepancies between the structural elements' design and actual concrete classes were identified. The initial conditions included real accelerograms at the location of the building, which served as input data for the direct dynamic analysis. Thus, there is a need to develop a hybrid system for modeling the stress–strain state of a 24‐story building that uses information technologies (Internet of Things) with sensors during research. Such an IoT system, combined with one information network using cloud technologies, allows us to obtain the necessary information in real‐time, highlighting the features of the building (the second stage of constructing the digital twin). The bar and spatial models of buildings with distributed parameters of structural stiffness at bending and shear and the mass and mass moment of inertia were considered. The results of numerical studies of the first form of natural vibrations for the building rod (according to the expressions obtained by the authors) and spatial models (performed using the LIRA‐CAD software package developed in Ukraine based on the finite element method) are presented. A comparison with the first experimental form of natural vibrations confirmed that considering the moment of inertia of the building mass makes it possible to determine the ordinates of the self‐form of vibrations and seismic horizontal loads more accurately. The experimental first frequency and form of natural vibrations of a 24‐story residential building in Odesa were obtained from the results of vibration monitoring at the construction stage (16 floors were erected) and after all 24‐floor erection. The direct dynamic method of building calculations for seismic effects specified by earthquake accelerograms was used along with the method proposed by the authors to consider damping during forced building vibration calculations and the actual physical and mechanical characteristics of concrete and reinforcement obtained by non‐destructive testing methods. The calculated vibration amplitudes at the top of the building cantilever model were compared with the damping parameters obtained using the Voicht model and the authors' method under the influence of an accelerogram recorded during the powerful 1977 Bucharest earthquake with an epicenter in the Vrancea area (Romanian Carpathians).

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