Interaction of Frame Structures  With Rolling Stock

Abdullayev, Seidulla; Bondar, I. S.; Bakyt, Gabit; Ashirbayev, G. K.; Будюкин, А М; Baubekov, Ye. Ye.

doi:10.32014/2021.2518-170x.3

Cited by 11 publications

(6 citation statements)

References 11 publications

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“…The data obtained when performing calculations of the spatial finite element model of a reinforced concrete overpass in the program "ABAQUS/Standard" are in agreement with the data obtained during in-situ tests of a reinforced concrete railway overpass. In the works of foreign [15][16][17][18] Russian [19] and Kazakhstani [20,21] specialists presented studies on experimental determination of the stress-strain state of girder spans of railway bridges, confirming the adequacy of the results presented in this article.…”

Section: Introductionsupporting

confidence: 75%

Stress-strain states of reinforced concrete spans of a railroad overpass using a spatial finite element model

Bondar,

Aldekeyeva,

Ospanova

2024

Vib. proced.

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The paper presents the results of computational analysis of the stress-strain state of reinforced concrete spans of the railway (single-track railway line) overpass over the highway, under specified loads using spatial finite element models. The static load consists of a cohesion of three TEM-18 diesel locomotives and two loaded gondola cars (up to 25 tons per axle). The purpose of this study was to ensure reliable and safe operation of artificial structures on the railroads, as there is a constant increase in transit freight trains from China through the territory of Kazakhstan to near and far abroad, and often the load on the axle reaches 25 tons, and sometimes larger values – up to 27 tons per axle. The results of the study are recommended to be used for inspections and tests of typical girder bridge spans, as well as in the case of monitoring their technical condition with increasing operational loads.

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Section: Introductionsupporting

confidence: 75%

Stress-strain states of reinforced concrete spans of a railroad overpass using a spatial finite element model

Bondar,

Aldekeyeva,

Ospanova

2024

Vib. proced.

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“…The analysis of experimental data characterizing the response of bridge structures allowed us to establish the parameters of natural vibrations of unloaded spans [25][26][27].…”

Section: Analysis Of Natural Frequencies Of Vibrations Of Girder Span...mentioning

confidence: 99%

Vibration diagnostics of transportation structures on railroads

Bondar,

Karibaeva,

Kurbenova

2024

Vib. proced.

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The article presents the results of the natural frequencies of vibrations of the span structure during the express-diagnostics, to excite the process of vibrations of the structure the pulse impact of the concentrated load of small mass is applied in the middle of the span structure (the method of small pulse impacts – “human jump”). The analysis of the obtained data, allowed to establish the parameters of free vibrations of unloaded span structures, the predominant frequencies on the graph of spectral density of dispersion are identical, regardless of the number of jumps, that is, the frequency of impact, if the time between jumps corresponds to the complete damping of vibrations. Of practical interest in the assessment of the technical condition is a quantitative assessment of the change in the natural frequency of vibration of girder metal and reinforced concrete spans depending on the presence of defects accumulated during the operation of the bridge. The obtained characteristics can serve as initial data, increasing the accuracy of calculations for calculations of artificial structures for seismic resistance, as well as in dynamic stability calculations for prospective loads and in the development of a model of the structure, the formation of algorithms of tasks to identify defects.

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“…The need for such crushed stone is determined by the restoration of roads, airfield runways, foundations for railway construction, etc. [25]- [28]. It is worth noting the significant potential of Ukraine in the raw material base for producing such crushed stone.…”

Section: Figure 1 Schedule For Assessing the Damage Caused To Ukraine...mentioning

confidence: 99%

Mining of non-metallic mineral deposits in the context of Ukraine’s reconstruction in the war and post-war periods

Saik,

Cherniaiev,

Anisimov

et al. 2023

Min. miner. depos.

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Purpose. The research purpose is to study the conditions for mining deposits of metamorphic and igneous origin to produce crushed stone products in conditions of limited electricity supply. Methods. The research uses an integrated approach, including data analysis on quarry field spatial dimensions and the overburden rock thickness, which provides the basis for identifying deposits into basic groups. For the identified groups of deposits, taking into account the hydrological characteristics of non-metallic deposits and their parameters, patterns have been determined that characterize the change in the normative atmospheric precipitation inflow, based on the quarry field area and the change in the specific costs for water drainage depending on the studied quarry field type. Based on data on technical characteristics of mobile and semi-stationary units and aggregates, the parameters of physical-mechanical properties of granites and diorites, technical-technological solutions for the formation of complexes for processing raw materials for the production of crushed stone products are proposed. Findings. Problems arising during mining operations under conditions of limited electricity supply, which is caused by mass attacks on Ukraine’s energy infrastructure, have been revealed. A systematization of deposits of igneous and metamorphic origin for mining of rock building materials, which are the basis for the production of crushed stone products, has been developed. The rates of water inflow into the mined-out space depending on the quarry field spatial parameters and the depth of mining operations have been studied. Technological schemes of the apparatuses of a complex for processing raw materials for production of crushed stone products and the apparatuses of a complex for processing siftings are proposed. Originality. Dependences of possible water inflow into the mined-out space of the quarry and change in energy consumption for water drainage have been determined, taking into account the accepted classification criteria, namely the quarry field spatial dimensions, the overburden rock thickness and the quarry depth. Practical implications. The obtained data on the possible water inflow into the mined-out space of the quarry and change in energy consumption for water drainage make it possible to assess the efficiency of pumping units. The proposed technical-technological solutions on formation of complexes for processing raw materials to produce crushed stone products have been developed in accordance with the fundamental provisions of the Law of Ukraine “On approval of the National program for the development of the mineral resource base of Ukraine for the period up to 2030”.

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Interaction of Frame Structures With Rolling Stock

Cited by 11 publications

References 11 publications

Stress-strain states of reinforced concrete spans of a railroad overpass using a spatial finite element model

Stress-strain states of reinforced concrete spans of a railroad overpass using a spatial finite element model

Vibration diagnostics of transportation structures on railroads

Mining of non-metallic mineral deposits in the context of Ukraine’s reconstruction in the war and post-war periods

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