| Autor: |
Oleksandr Voskoboinyk, Dmytro Cherny, Vladimir Turick, Vladimir Voskoboinick, Lidia Tereshchenko, Andrey Voskoboinick |
| Rok vydání: |
2020 |
| Předmět: |
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| Zdroj: |
Advances in Computer Science for Engineering and Education III ISBN: 9783030555054 |
| DOI: |
10.1007/978-3-030-55506-1_1 |
| Popis: |
Pile groups and complex piers have become more popular in the construction of bridge crossings due to economical and geotechnical reasons. The interaction of bridge piers of various structural solutions, which are in the wake one after another, leads to significant discontinuity and non-linearity of the flow between the piers, and also significantly complicates the process of bed sediment scour. This requires complex scientific research to determine the permissible bed sediment scour near bridge pier groups, since normative calculations do not always give a positive result. Results of experimental researches of formation and development of local and global scours near to bridge piers are submitted. Influence of an arrangement of two bridge transitions which are in a wake one after another, on physics of the formation process scour is shown. The scour before prismatic pier is caused by interaction of the horseshoe vortex structures with the sediment, down flow along the front surface of the pier and vortex systems that arise when the incoming flow is separated from the front faces of the prismatic pier. The scour before the three-row cylindrical pier in the form of the grillage is associated with the action of a horseshoe vortex structure that envelopes the grillage as a whole, horseshoe vortices that arise near each of the cylindrical piers of the grillage and the jet flow that occurs between the first piers of the grillage. With the mutual arrangement of two bridge crossings that are in the wake one after another, the local scour in front of the prismatic pier of the old bridge increases at supercritical flow velocities in shallow water and decreases at subcritical velocities in deep water. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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