Study of Railway Steel Bridges’ Behaviour in Order to Identify the Causes of Their Defects

Kliuchnyk, S. V.; Ovchynnykov, P. A.

doi:10.12700/aph.19.3.2022.3.7

Cited by 3 publications

(1 citation statement)

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“…Напружено-деформований стан окремо залізобетону і сталі та сталезалізобетонних прогонових будов достатньо вивчений [12,13]. Стан нормативної бази проєктування в Україні дає можливість доволі чітко розуміти та якісно прогнозувати роботу сталезалізобетонних прогонових будов мостів.…”

Section: вступunclassified

The results of field studies of the stress-strain state steel-reinforced concrete span structure of the railway bridge

HERNICH¹,

KLIUCHNYK²

2022

STP

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Purpose. The purpose of the study was to determine the stress-strain state and operating characteristics of the existing steel-reinforced-concrete span structure under the railway after long-term operation under static and dynamic loads. Methodology. To achieve the goal, full-scale surveys of the existing bridge crossing were carried out, more attention was focused on the steel-reinforced concrete span structure, the conditions and features of its operation were determined, and static and dynamic tests were conducted. During the tests, the general deformations of the span structures (vertical and horizontal deflections) and the stress state in the elements of the structures under different load schemes were measured. During dynamic tests, registration of static and dynamic component deflections and stress changes in structural elements during the passage of rolling stock along the span structure was carried out. The interaction of the span structure with the rolling stock, the influence of uneven approaches to the bridge on the excitation of the rolling stock was investigated. Findings. The values of stresses in the elements of the steel-reinforced-concrete span structure were obtained when the test load was installed in the position at which the greatest stresses and deformations should occur in the test elements, the frequencies of natural and forced oscillations of the span structure were measured, the dynamic coefficient, the dynamic deflections of the main beams were determined, the values decrements of oscillations of the frequency of natural and forced oscillations. The dynamic interaction of the rolling stock with the steel-reinforced concrete span structure was studied. Analytical assumptions in the design of steel-reinforced-concrete span structures of bridges have been confirmed. Originality In the work, a study of the stress-deformed state of the steel-reinforced concrete span structure of the railway bridge after long-term operation, the simultaneous operation of the span structure with rolling stock was carried out. Practical value. The operating conditions of the steel-reinforced-concrete span structure of the railway bridge, static and dynamic characteristics of its operation, the interaction of the rolling stock with the span structure, the influence of the unevenness of the approach track to the bridge on the dynamic interaction of the span structure and the rolling stock are determined. Practically confirmed analytical calculations of deformation and dynamic characteristics of steel-reinforced-concrete span structures of bridges, the joint operation of steel beam and reinforced concrete slab is ensured to a sufficient extent and corresponds to theoretical assumptions.

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Section: вступunclassified

The results of field studies of the stress-strain state steel-reinforced concrete span structure of the railway bridge

HERNICH¹,

KLIUCHNYK²

2022

STP

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Development of a rating model for assessing the condition of steel railway bridges

Nakkawita,

Pushpakumara

2024

Journal of Safety and Sustainability

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Features of the Stressed-Strain State of a Steel-Reinforced-Concrete Span Structure with Preliminary Bending of a Steel Beam

POPOVICH¹,

KLIUCHNYK²

2022

STP

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Purpose. The authors aim to determine the features of the operation of a steel-reinforced concrete span structure with beams reinforced with an I-beam, with their pre-stressing using the bending of a steel I-beam. Methodology. To manufacture a steel-reinforced concrete span structure, it was proposed to reinforce an I-beam with a camber, which is then leveled with the help of applied external loads. For practical convenience, the vertical external forces are replaced by horizontal forces that keep the metal I-beam in a deformed state and in this state it is concreted. After the concrete strength development, the external forces are removed and the metal I-beam creates the pre-stressing of the concrete. Findings. When determining stresses, checking calculations by analytical method and the method of modeling with the help of the ANSYS program were used. The stress diagrams along the lower and upper fibers of a metal I-beam and stresses in concrete in the upper and lower zones of the beam were constructed. The analysis of the results showed that the pre-bending of a metal beam can be used to create a pre-stressing, which improves the performance of steel-reinforced concrete span structures, increases their rigidity and allows using of such a structure to increase the balks of railway and highway bridges. Originality. In the paper, a study of the stress-strain state of steel-reinforced concrete beams of the railway span structure was carried out, taking into account the pre-stressing of the concrete. A method of manufacturing a steel-reinforced concrete beams is proposed, which provides pre-stressing of the reinforced concrete due to the bending of a steel I-beam. Practical value. As a result of the calculations, it was found that the structure, when manufactured by the specified method, has greater rigidity compared to reinforced concrete or metal beams. The height of the beam can be lower compared to reinforced concrete or metal span structures. These circumstances are essential for railway bridges, especially for high-speed traffic ones.

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Study of Railway Steel Bridges’ Behaviour in Order to Identify the Causes of Their Defects

Cited by 3 publications

References 0 publications

The results of field studies of the stress-strain state steel-reinforced concrete span structure of the railway bridge

The results of field studies of the stress-strain state steel-reinforced concrete span structure of the railway bridge

Development of a rating model for assessing the condition of steel railway bridges

Features of the Stressed-Strain State of a Steel-Reinforced-Concrete Span Structure with Preliminary Bending of a Steel Beam

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