Evaluation of Monitoring the Process of Deformation and Sedimation of a Right Line Vertical Rod

Isayev, Oleg; Gulayev, Yu.; Strilets, Volodymyr; Chulanov, P.

doi:10.32347/0130-6014.2019.67.15-21

Cited by 2 publications

(4 citation statements)

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“…In the source [4], there was developed the principle of the fundamental calculation of a priori measuring accuracy of the stretching element deformation of the building construction in the form of a vertical rod. In the source [3] there was carried out the calculation of the RMSE measurement (root mean square error) of the deformation of the rod stretching according to parameters depending on the material and on the stresses arising in it under load. There was demonstrated the possibility of measuring the stretching deformation with accuracy obtained from the calculation.…”

Section: Analysis Of Researches and Publicationsmentioning

confidence: 99%

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Monitoring of the elements stability of building constructions by means of example of vertical elastic rod of high flexibility

Isaev

Annenkov

Demianenko

et al. 2022

OMTC

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The article is related to the field of geodetic and engineering construction monitoring of building structures in the form of rod systems. It investigates the measurement accuracy of the compression deformation of the rod. As an example, there is considered a vertical rectilinear rod of high flexibility, loaded with a longitudinal axial force. Experience demonstrates that the rod, under the influence of an axial compressive load not exceeding the permissible design values, retains its original form of equilibrium and stability. At the same time, it works in the field of elastic compression deformations. As the load increases to its critical values, there occurs a particular state of the element when the form of equilibrium becomes unstable, and at any moment, it can turn from a straight line into a curvilinear one with a slight external influence or as a result of position errors. This is accompanied by large displacements and permanent deformations. The importance of monitoring is noted when a building structure with similar constructions, for example, is situated in the area of development of negative natural and anthropogenic processes. As a result, the load on some elements may increase to critical values due to uneven horizontal and vertical displacement and inclination of the structure, including vibrations, etc. Attention is focused on the fact that the complex of engineering and technical measurements should show, with the necessary completeness, reliability and accuracy of the value, the nature and dynamics of changes in the external load on the elements of the building structure, changes in internal forces and stresses in them, the development of deformations (changes in the size and shape of equilibrium). There is explained the accuracy with which it is necessary to measure the displacement of the rod end during the deformation. There was derived the dependence with the help of which it is possible to see the root-mean-square error of the displacement measuring that depends on the choice of the maximum stress deviation in the sections of the rod made of a certain material. There is laid out the calculation of the maximum stress deviation based on the stability and flexibility of the rod.

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Section: Analysis Of Researches and Publicationsmentioning

confidence: 99%

“…With the parameter of rod flexibility λ = 100, the critical stress will be at the point of the proportionality limit. Let us take the interval δσ = 10 MPa and k = 1 [3], then m z = 0.06 mm.…”

Section: Presentation Of the Main Materialsmentioning

confidence: 99%

Monitoring of the elements stability of building constructions by means of example of vertical elastic rod of high flexibility

Isaev

Annenkov

Demianenko

et al. 2022

OMTC

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“…У постановці проблеми вказується, що система моніторингу повинна відчувати зміни напружено-деформованого стану. У розвиток цього, на наш погляд, чутливість та точність системи моніторингу має особливе значення, оскільки дозволяє контролювати НДС по всій лінійці розвитку деформацій, не пропускаючи моменти переходу від одного стану до іншого[30]. А безперервна фіксація процесу розвитку, починаючи від первісного стану, дозволяє отримувати абсолютні значення напружень і деформацій.Точність, з якою необхідно вимірювати параметри НДС, наприклад: деформації, зміщення, нахили -це особливе питання, тому що від цього залежить знання реального стану конструкції на кожний певний момент часу.…”

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“…Залежно від точності створюється система моніторингу, підбираються прилади та методи. Питанням точності вимірювань ми приділяли увагу в роботах[25,29,30]. Зазначимо, що попередній розрахунок точності показує дуже високу необхідну точність вимірів.…”

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Monitoring of structures with bearing elements in the form of long vertical rods

Isaev,

Bondar,

Medvedskyi

et al. 2023

OMTC

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A building structure is considered, which in the design form consists of two vertical rectilinear interacting elements. One of them is loading, the other is carrying. The bearing element is presented in the form of a long thin rod loaded with an external axial vertical force. Due to the errors of geodetic verification and installation work, the bearing rod will be installed with some inclination and displacement relative to the coordinate axes. The external load on the bearing element is represented by the force vector, which is equivalent to the loading rod. Errors of geodetic verification and installation work will change the design direction of the force line and its design position on the supporting element. An inclined force vector will have a vertical and horizontal force component. Thus, the line of action of the loading force and the longitudinal axis of the supporting rod will be located at an angle to each other, which will cause bending momentsand transverse forces in the sections of the rod. A design "changed" in relation to the project is created. Bending moments and horizontal forces in this design will contribute to premature bending of the rod. An unevenly heated rod also acquires the ability to distort. The influence of the specified factors can be increased, and the stability of the rod significantly weakened due to uneven subsidence, horizontal displacement or tilting of the supporting structure due to dangerous exogenous geological processes. Therefore, errors in the position of elements, changes in temperature, geological processes disrupt the linear form of equilibrium of the bearing rod and its position in space. The change in shape and relative position contributes to the premature emergence of an unstable state under an increasing external load. In the changed design, the bearing rod may suddenly find itself in a critical stress-deformed state. The task of monitoring is to sense and properly record changes and dynamics of the stress-strain state. For this purpose, measuring complexes with a certain configuration are designed, which provide with the necessary specified accuracy the measurement of changes in the physical state of the elements of building structures.

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Evaluation of Monitoring the Process of Deformation and Sedimation of a Right Line Vertical Rod

Cited by 2 publications

References 0 publications

Monitoring of the elements stability of building constructions by means of example of vertical elastic rod of high flexibility

Monitoring of the elements stability of building constructions by means of example of vertical elastic rod of high flexibility

Monitoring of structures with bearing elements in the form of long vertical rods

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