Original title: Wind tunnel tests for lifetime estimation of bridge and mast cables exposed to vortex induced vibrations
Authors: Trush, Arsenii ; Pospíšil, Stanislav ; Kuznetsov, Sergeii
Document type: Papers
Conference/Event: Youth Symposium on Experimental Solid Mechanics /17./, Telč (CZ), 20190606
Year: 2019
Language: eng
Abstract: A significant number of TV and radio broadcasting masts in the Czech Republic was built in the 70-80s of the last century. At the moment is an actual issue is the reconstruction and determination of residual life of these structures. Guyed masts and particularly guy ropes have significant dimensions and comparatively low mass and damping with high flexibility. Therefore, aerodynamic and aeroelastic loads, such as vortex induced vibrations, galloping, wind gusts, etc., are key for them. As a tensile construction elements (guy ropes) for guyed masts the traditional open wire spiral strand cables are used. This type of cable has a characteristic helical surface roughness pattern that can act as vortex suppressor, high fatigue endurance, although somewhat lower corrosion resistance comparing to modern locked coil cables with non-circular shaped wires of outer layer and cables with protective polymer coatings. At the same time, on numerous bridges with the above-mentioned modern cable types the fatigue damage to wires in anchorage zones and destruction of protective coatings was detected. Present paper provides results of wind tunnel testing of three models of helical strake cable in order to evaluate separately impact of lay angle and surface roughness factors and reference smooth cylinder model in flow with grid generated turbulence of different intensities. The reduction of the lock-in range of helical strand cables comparing to reference smooth model was observed whereby the greatest impact was an increase of lay angle.
Keywords: bridge cable; vortex shedding; wind tunnel
Project no.: GA19-04695S (CEP)
Funding provider: GA ČR
Host item entry: Book of Abstracts. XVIIth Youth Symposium on Experimental Solid Mechanics, ISBN 978-80-86246-45-1

Institution: Institute of Theoretical and Applied Mechanics AS ČR (web)
Document availability information: Fulltext is available at the institute of the Academy of Sciences.
Original record: http://hdl.handle.net/11104/0296582

Permalink: http://www.nusl.cz/ntk/nusl-395936

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Research > Institutes ASCR > Institute of Theoretical and Applied Mechanics
Conference materials > Papers
 Record created 2019-06-11, last modified 2019-06-11

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