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Title Vibration Control of Bridge Cables
Author Kleissl, Kenneth (Section for Structural Engineering, Department of Civil Engineering, Technical University of Denmark, DTU, DK-2800 Kgs. Lyngby, Denmark)
Supervisor Georgakis, Christos (Section for Structural Engineering, Department of Civil Engineering, Technical University of Denmark, DTU, DK-2800 Kgs. Lyngby, Denmark)
Institution Technical University of Denmark, DTU, DK-2800 Kgs. Lyngby, Denmark
Thesis level Master's thesis
Year 2009
Abstract In this project, the viability of modifying cable shape and surface has been examined for the elimination of wind-induced vibrations. An experimental investigation has been carried out in a high-speed wind tunnel facility for cylinders, with different passive flow improvements, such as shrouding, waviness and faceting, including a circular cylinder for reference. The cylinders were tested in a static inclined setup, allowing the cylinder to be installed at a yawed position and with all tests conducted at both smooth and turbulent flow conditions. The aerodynamic damping has been evaluated by applying instability models based on the quasi-steady theory. While the other cylinders suffered from dry inclined galloping, Drag Crisis, or Den Hartog galloping, the shrouded cylinder was found as the only solution capable of completely suppressing any form of instability risk, but at the cost of a slight increase in drag at the design wind speed.
Imprint Technical University of Denmark (DTU) : Kgs. Lyngby, Denmark
Pages 186
Keywords bridge cable vibration; shape modifications; aerodynamic damping; passive damping device; aerodynamic instability; yawed flow
Fulltext
Original PDF Master_Project.pdf (4.65 MB)
Admin Creation date: 2010-06-14    Update date: 2010-06-14    Source: dtu    ID: 263753    Original MXD