Počet záznamů: 1  

Wind tunnel tests for lifetime estimation of bridge and mast cables exposed to vortex induced vibrations

  1. 1.
    0505065 - UTAM-F 2020 RIV CZ eng C - Konferenční příspěvek (zahraniční konf.)
    Trush, Arsenii - Pospíšil, Stanislav - Kuznetsov, Sergeii
    Wind tunnel tests for lifetime estimation of bridge and mast cables exposed to vortex induced vibrations.
    Book of Abstracts. XVIIth Youth Symposium on Experimental Solid Mechanics. Prague: Institute of theoretical and applied mechanics, 2019 - (Kytýř, D.; Doktor, T.; Zlámal, P.), s. 34-34. ISBN 978-80-86246-45-1.
    [Youth Symposium on Experimental Solid Mechanics /17./. Telč (CZ), 06.06.2019-08.06.2019]
    Grant CEP: GA ČR(CZ) GA19-04695S
    Institucionální podpora: RVO:68378297
    Klíčová slova: bridge cable * wind tunnel * vortex shedding
    Kód oboru RIV: JM - Inženýrské stavitelství
    Obor OECD: Civil engineering

    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.
    Trvalý link: http://hdl.handle.net/11104/0296582