Кафедра " Транспортна інфраструктура" ДІІТ (з 2022 року кафедра увійшла до складу факультета Будівництво, архітектура та інфраструктура <br> ( з 2021 року після об'єднання кафедр "Мости та тунелі"; "Колія та колійне господарство"; "Проєктування і будівництво доріг")

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http://crust.ust.edu.ua/handle/123456789/12798

ENG:Department of "Transport Infrastructure"

(since 2021 after the merger of the departments "Bridges and Tunnels"; "Track and track economy"; "Design and construction of roads")

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Controlling the Dynamic Characteristics of Steel Bunker Containers for Bulk Materials
(IOP Conference Series: Earth and Environmental Science, 2024) Bannikov, Dmytro O.; Tiutkin, Oleksii L.; Hezentsvei, Yukhym; Muntian, Antonina O.
ENG: The article presents the main results of research devoted to the definition and analysis of the dynamic characteristics of steel small-sized bunker containers for storing bulk materials. All studies were carried out using the finite element method with the use computer complex SCAD. The object of research was a bunker of a bypass track for feeding bulk materials with a total volume of up to 70 m3. The study analysed the natural partial frequency spectrum and the partial oscillation modes of individual load-bearing elements of the bunker. Based on the results of the data analysis, a rather high quantitative density of the natural frequency spectrum was determined. At the same time, its lower limit is about 25-30 Hz for an empty bunker capacity and decreases to 3-5 Hz when the bunker is fully loaded, which is dangerous from the point of view of the possibility of resonance phenomena. In order to qualitatively and quantitatively control the dynamic characteristics, it was proposed to change the steel strength of the structure, which made it possible to change the natural frequencies by about 15% for every 100 MPa change in steel strength for the bunker containers of the considered type.
Regularities of the Deformed State of the Geotechnical System “Soil Base – Micropile”
(IOP Publishing Ltd, 2022) Petrenko, Volodymyr D.; Bannikov, Dmytro O.; Kharchenko,Vitalii; Tkach, Taisiia
ENG: Definition and predicting the deformed state of the geotechnical system "soil base – micropile" are the relevant scientific and technical objective when strengthening the soil base by reinforcing elements. The complexity of solving such a problem lies in the heterogeneity of the deformation characteristics for the parts of the specified system. The application of mathematical modeling based on the finite-element method allows defining the behavior of the deformed state in the geotechnical system "soil base – micropile" in the variation of the elastic modulus of its elements. In the course of the numerical analysis of twenty finite-element models characterized by a change in the elastic modulus of the micropile material and soil base, the value of maximum vertical displacements of the strip foundation for the civil structure is obtained. The generalization of these values makes it possible to construct diagrams of their changes in accordance with the variation of the elastic modulus. The obtained regularities allow predicting a deformed state for a sufficiently wide range of the elastic modulus for elements in the system "soil base – micropile".
Substantiating the Parameters for a Non-Circular Structure of the Mine Shaft under Construction in a Heterogeneous Rock Massif
(IOP Publishing Ltd, 2022) Alkhdour, Ahmad M.; Tiutkin, Oleksii L.; Bannikov, Dmytro O.; Heletiuk, Ihor
ENG: Mine shafts are those workings without which the normal operation of coal enterprises and underground construction facilities is impossible. The new experience in the construction of mine shafts for the Dnipro Metro is based on the rejection of prefabricated structures. In addition, the ellipse structure of the mine shaft 15 bis of the Dnipro Metro is uncharacteristic for construction in Soviet and post-Soviet Ukraine. That is why technological advancements in the design of vertical workings for the non-circular structure require scientific justification. The complexity of operating such underground facilities under the engineering and geological conditions in the city of Dnipro is the interaction with a heterogeneous massif. Therefore, the design of the mine shaft frame involves its division into parts (the so-called pile system and shotcrete system). The finite-element models of both systems have been developed. A search for the force factors in a non-circular structure of the shaft has been carried out; the parameters for both systems have been substantiated. The results of the analysis have made it possible to scientifically substantiate the structural solutions. They enable the prediction of high strength indicators of the mine shaft under construction in a heterogeneous rock massif.

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