Wind tunnel investigations of an inclined stay cable with a helical fillet.

Details

• Creators:
  Larose, Guy L. ; D'Auteuil, Annick
• Corporate Creators:
  National Research Council Canada ; Genex Systems, LLC
• Corporate Contributors:
  United States. Department of Transportation. Federal Highway Administration. Office of Infrastructure Research and Development
• Subject/TRT Terms:
  • Long span bridges
  • Cable stayed bridges
  • Rain
  • Wind
  • Damping (Physics)
  • Vibration
  • Bridge design
  • Vibration control
  • Wind tunnels
• Publication/ Report Number:
  FHWA-HRT-14-070
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States
• Corporate Publisher:
  Turner-Fairbank Highway Research Center
• Abstract:
  Cable-stayed bridges have been recognized as the most efficient and cost effective structural form for medium-to-long-span bridges over the past several decades. With their widespread use, cases of serviceability problems associated ; with large amplitude vibration of stay cables have been reported. Stay cables are laterally flexible structural members ; with very low inherent damping and thus are highly susceptible to environmental conditions such as wind and ; rain/wind combination. ; Recognition of these problems has led to the incorporation of different types of mitigation measures on many cable-stayed bridges around the world. These measures include surface modifications, cable crossties, and external dampers. ; Modification of cable surfaces has been widely accepted as a means to mitigate rain/wind vibrations. Recent studies ; have firmly established the formation of a water rivulet along the upper side of the stay and its interaction with wind ; flow as the main cause of rain/wind vibrations. Appropriate modifications to exterior cable surfaces effectively disrupts ; the formation of a water rivulet. ; The objective of this study is to supplement the existing knowledge base on some of the outstanding issues of stay ; cable vibrations and to develop technical recommendations that may be incorporated into design guidelines. ; Specifically, this project focused on the wind-cable interaction, with particular interest in details of the air flow and ; flow field close to the cable as well as forces on the cable surface. A helical fillet was attached to an existing cable ; model to evaluate the influence of this common mitigation feature on dynamic behavior. The cable inclination angle ; was varied during testing to represent field orientations, and the model was rotated on its longitudinal axis to assess the ; influence of high-density polyethylene roundness. Tests were conducted at various levels of damping, with and without ; the fillet, and in turbulent as well as smooth flow conditions.
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• Format:
  PDF
• Funding:
  DTFH61-07-D-00034
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/28050/dot_28050_DS1.pdf
• File Type:
  [PDF - 14.39 MB]
• Collection(s):
  US Transportation Collection ; Federal Highway Administration
• Main Document Checksum:
  urn:sha-512:45260daab6a31776483a42a4c9722f58e9f1928878468f88d79f4269de8b8da2c7e50ae564f31cea5545b77539ead3855e9ead596697b1422f0c37dcd7a04f65