Complex method of defects diagnostics in underground structures

Beskopylny, Alexey; Lyapin, A. A.; Kadomtsev, M. I.; Veremeenko, Andrey

doi:10.1051/matecconf/201814602013

Cited by 21 publications

(10 citation statements)

References 8 publications

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“…The buckling analysis relates to geometrically nonlinear problems and to solve differential equations often use Bubnov-Galerkin methods [10,11], genetic algorithms [12] and practices based on Fourier transforms [13,14,15].…”

Section: Matec Web Of Conferences 193mentioning

confidence: 99%

Buckling analysis of rod structure of the two-tier dome

2018

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Abstract. The paper deals with the problem of calculating the rod structure of a two-tier dome for stability. Such structures consisting of straight rod elements are widely used in practice and have a number of significant advantages. First of all, it is a high rigidity with a low mass. Also, this type of construction is well resistant to dynamic loads. At the same time, the dome model allows for the bifurcation of points on the equilibrium state curve of the system. The problem of the dynamic stability of double dome is solved by the principle of stationarity of total potential energy of the system. The analysis of the obtained solution is carried out, and the equilibrium state diagram for a two-tier core dome is constructed.

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Section: Matec Web Of Conferences 193mentioning

confidence: 99%

Buckling analysis of rod structure of the two-tier dome

2018

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“…Analysis of the dynamic response of heterogeneous layered media with the aim of developing a method of NDT and determining their mechanical and strength characteristics was carried out in [ 19 , 20 ]. A comprehensive diagnostic method was proposed in [ 21 ] based on the analysis of the unsteady response of a multilayer structure, on the surface of which a shock load acts. During the solution procedure, various methods of genetic algorithms are used which have shown good results.…”

Section: Introductionmentioning

confidence: 99%

Structural Monitoring of Underground Structures in Multi-Layer Media by Dynamic Methods

Lyapin

Beskopylny

Meskhi

2020

Sensors

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The actual problem of structural monitoring and modeling of dynamic response from buried building is considered in the framework of arbitrary dynamic load. The results can be used for designing underground transport constructions, crossings, buried reservoirs and foundations. In existing methods, the system of sensors that register the response to a dynamic action does not allow for effective interpretation of the signal without understanding the dynamic features and resonance phenomena. The analytical and numerical solution of the problem of the dynamics of a buried object in a layered medium is considered. A multilayer half-space is a set of rigidly interconnected layers characterized by elastic properties. At a distance, an arbitrary dynamic load acts on the half-space, which causes oscillations in the embedded structure, and the sensor system registers the response. The problem of assessing the dynamic stress-strain state (DSSS) is solved using Fourier transforms with the principle of limiting absorption. As an example, the behavior of an embedded massive structure of an underground pedestrian crossing under the influence of a dynamic surface source on a multilayer medium is considered, as well as instrumental support of the sensor system. The solution in the form of stress, strain and displacement fields is obtained and compared with the experimental data. The frequency-dependent characteristics of the system are determined and the possibility of determining the DSSS by a shock pulse is shown.

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“…In construction area, these methods are widely used for design projects, diagnostics and monitoring of structures. These are non-destructive tests based on indentation methods that used for metal structures [8,9], determination of the rheological parameters for the creep models [10]. Equation 2expresses the condition of compatibility of heterogeneous beam deformations.…”

Section: Introductionmentioning

confidence: 99%

Static analysis of a reinforced bimodulus beam on elastic foundation

2018

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The work considers a reinforced concrete beam made of bimodule material on an elastic Winkler base. The influence of the number of reinforcing bars located in the stretched zone on the maximum normal stress and the maximum deflection is numerically investigated. The choice of the cross-section dimensions, such as the width and thickness of the flanges, the height of the beam, causes particular difficulties and is limited by the need to determine specific ratios of I-beam sizes. Numerical investigation allows analyzing the influence of the width of the I-beam flange that is in contact with the elastic base on the maximum tensile stresses and maximum deflection. The effect on the stressed-deformed state of the various cross-section forms is carried out in work for an I-beam, a rectangle, and a T-beam. Related to the fact that for many building materials the elastic moduli for tension and compression differ, it became necessary to determine the influence of material heterogeneity on the stress-strain state of the elements of building structures. In particular, the widespread use of reinforced concrete beams as elements of band foundations requires a refinement of the stress-strain state study taking into account the heterogeneity of concrete.

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Complex method of defects diagnostics in underground structures

Cited by 21 publications

References 8 publications

Buckling analysis of rod structure of the two-tier dome

Buckling analysis of rod structure of the two-tier dome

Structural Monitoring of Underground Structures in Multi-Layer Media by Dynamic Methods

Static analysis of a reinforced bimodulus beam on elastic foundation

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