Features of the bridge span performance when shifting the axis of the rail-sleeper grid
Engineering structures form an integral part of the railways, both already operated and yet designed. The joint work of the upper structure of the railway track and the supporting structures of the bridge crossing is an important condition for the normal operation of the railway section without vari...
Saved in:
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | Russian |
| Published: |
Joint Stock Company «Railway Scientific and Research Institute»
2020-07-01
|
| Series: | Вестник Научно-исследовательского института железнодорожного транспорта |
| Subjects: | |
| Online Access: | https://www.journal-vniizht.ru/jour/article/view/412 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1849244587067965440 |
|---|---|
| author | V. V. Korolev A. A. Loktev I. V. Shishkina E. A. Gridasova |
| author_facet | V. V. Korolev A. A. Loktev I. V. Shishkina E. A. Gridasova |
| author_sort | V. V. Korolev |
| collection | DOAJ |
| description | Engineering structures form an integral part of the railways, both already operated and yet designed. The joint work of the upper structure of the railway track and the supporting structures of the bridge crossing is an important condition for the normal operation of the railway section without various restrictions and additional work on the current maintenance and diagnostics of structural elements. Presented study is devoted to the investigation of the stress-strain state of a small railway bridge with a beam design, when the axis of the rail-sleeper grid relative to the axis of the bridge is shifted by an amount exceeding the limit value determined by regulatory documents. In the analytical calculation of the behavior parameters and the state of the span under the action of the load, a differential equation is used that describes the vertical vibrations of the beam and allows considering them as a combination of forced and free vibrations. In numerical modeling, the finite element method is used as the solution method, the deter mining equations of which contain linear and angular displacements of nodes of the calculation scheme as unknowns. As a result of the calculations, graphical dependences for normal and horizontal displacements, internal forces, principal and equivalent stresses at various points of the span are obtained. Presented values show an increase in bending and torsional forces, as well as principal stresses when the axis of the railway track is displaced relative to the axis of the bridge. It is noted that although the increase in stresses (by about 6 %) can generally be considered insignificant, the presence of defects in the span beams (concrete chips, cracks in the stretched zone, exposure and corrosion of working reinforcement, decrease in the calculated cross section, leaching of cement stone from concrete, decrease in concrete strength over time) can make it a significant enough factor limiting the operational capabilities of bridge crossings. |
| format | Article |
| id | doaj-art-0f202f3268cc401caf4fd7ae89bd2ee8 |
| institution | Kabale University |
| issn | 2223-9731 2713-2560 |
| language | Russian |
| publishDate | 2020-07-01 |
| publisher | Joint Stock Company «Railway Scientific and Research Institute» |
| record_format | Article |
| series | Вестник Научно-исследовательского института железнодорожного транспорта |
| spelling | doaj-art-0f202f3268cc401caf4fd7ae89bd2ee82025-08-20T03:59:08ZrusJoint Stock Company «Railway Scientific and Research Institute»Вестник Научно-исследовательского института железнодорожного транспорта2223-97312713-25602020-07-0179312713810.21780/2223-9731-2020-79-3-127-138285Features of the bridge span performance when shifting the axis of the rail-sleeper gridV. V. Korolev0A. A. Loktev1I. V. Shishkina2E. A. Gridasova3Federal State Autonomous Educational Institution of Higher Education “Russian University of Transport” (FGAOU VO RUT (MIIT))Federal State Autonomous Educational Institution of Higher Education “Russian University of Transport” (FGAOU VO RUT (MIIT))Federal State Autonomous Educational Institution of Higher Education “Russian University of Transport” (FGAOU VO RUT (MIIT))Federal State Autonomous Educational Institution of Higher Education “Far Eastern Federal University” (FGAOU VO DVFU)Engineering structures form an integral part of the railways, both already operated and yet designed. The joint work of the upper structure of the railway track and the supporting structures of the bridge crossing is an important condition for the normal operation of the railway section without various restrictions and additional work on the current maintenance and diagnostics of structural elements. Presented study is devoted to the investigation of the stress-strain state of a small railway bridge with a beam design, when the axis of the rail-sleeper grid relative to the axis of the bridge is shifted by an amount exceeding the limit value determined by regulatory documents. In the analytical calculation of the behavior parameters and the state of the span under the action of the load, a differential equation is used that describes the vertical vibrations of the beam and allows considering them as a combination of forced and free vibrations. In numerical modeling, the finite element method is used as the solution method, the deter mining equations of which contain linear and angular displacements of nodes of the calculation scheme as unknowns. As a result of the calculations, graphical dependences for normal and horizontal displacements, internal forces, principal and equivalent stresses at various points of the span are obtained. Presented values show an increase in bending and torsional forces, as well as principal stresses when the axis of the railway track is displaced relative to the axis of the bridge. It is noted that although the increase in stresses (by about 6 %) can generally be considered insignificant, the presence of defects in the span beams (concrete chips, cracks in the stretched zone, exposure and corrosion of working reinforcement, decrease in the calculated cross section, leaching of cement stone from concrete, decrease in concrete strength over time) can make it a significant enough factor limiting the operational capabilities of bridge crossings.https://www.journal-vniizht.ru/jour/article/view/412small bridgereinforced concrete spannon-axis symmetric loadfinite element methodbeam methoddynamic impactvertical shifts |
| spellingShingle | V. V. Korolev A. A. Loktev I. V. Shishkina E. A. Gridasova Features of the bridge span performance when shifting the axis of the rail-sleeper grid Вестник Научно-исследовательского института железнодорожного транспорта small bridge reinforced concrete span non-axis symmetric load finite element method beam method dynamic impact vertical shifts |
| title | Features of the bridge span performance when shifting the axis of the rail-sleeper grid |
| title_full | Features of the bridge span performance when shifting the axis of the rail-sleeper grid |
| title_fullStr | Features of the bridge span performance when shifting the axis of the rail-sleeper grid |
| title_full_unstemmed | Features of the bridge span performance when shifting the axis of the rail-sleeper grid |
| title_short | Features of the bridge span performance when shifting the axis of the rail-sleeper grid |
| title_sort | features of the bridge span performance when shifting the axis of the rail sleeper grid |
| topic | small bridge reinforced concrete span non-axis symmetric load finite element method beam method dynamic impact vertical shifts |
| url | https://www.journal-vniizht.ru/jour/article/view/412 |
| work_keys_str_mv | AT vvkorolev featuresofthebridgespanperformancewhenshiftingtheaxisoftherailsleepergrid AT aaloktev featuresofthebridgespanperformancewhenshiftingtheaxisoftherailsleepergrid AT ivshishkina featuresofthebridgespanperformancewhenshiftingtheaxisoftherailsleepergrid AT eagridasova featuresofthebridgespanperformancewhenshiftingtheaxisoftherailsleepergrid |