Název: Wind tunnel tests for lifetime estimation of bridge and mast cables exposed to vortex induced vibrations
Autoři: Trush, Arsenii ; Pospíšil, Stanislav ; Kuznetsov, Sergeii
Typ dokumentu: Příspěvky z konference
Konference/Akce: Youth Symposium on Experimental Solid Mechanics /17./, Telč (CZ), 20190606
Rok: 2019
Jazyk: eng
Abstrakt: 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.
Klíčová slova: bridge cable; vortex shedding; wind tunnel
Číslo projektu: GA19-04695S (CEP)
Poskytovatel projektu: GA ČR
Zdrojový dokument: Book of Abstracts. XVIIth Youth Symposium on Experimental Solid Mechanics, ISBN 978-80-86246-45-1

Instituce: Ústav teoretické a aplikované mechaniky AV ČR (web)
Informace o dostupnosti dokumentu: Dokument je dostupný v příslušném ústavu Akademie věd ČR.
Původní záznam: http://hdl.handle.net/11104/0296582

Trvalý odkaz NUŠL: http://www.nusl.cz/ntk/nusl-395936

Záznam je zařazen do těchto sbírek:
Věda a výzkum > AV ČR > Ústav teoretické a aplikované mechaniky
Konferenční materiály > Příspěvky z konference
 Záznam vytvořen dne 2019-06-11, naposledy upraven 2019-06-11.

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