Dynamic properties of stay cables on the Penobscot Narrows bridge.

Details

• Creators:
  Bosch, Harold R. ; Pagenkopf, James R.
• Corporate Creators:
  Genex Systems, LLC
• Subject/TRT Terms:
  Bridge Design Cable Stayed Bridges Dampers Hazard Mitigation Rain Serviceability Vibration Vibration Tests Wind
• Publication/ Report Number:
  FHWA-HRT-14-067
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States
• Corporate Publisher:
  United States. Department of Transportation. Federal Highway Administration. Office of Infrastructure Research and Development
• 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 led to the incorporation of different types of mitigation measures on many cable-stayed
  
  bridges around the world. These measures included 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 modification of exterior cable surface effectively disrupts
  
  the formation of a water rivulet.
  
  The objective of this study was to supplement the existing knowledge base on some of the outstanding issues of stay
  
  cable vibrations and develop technical recommendations that may be incorporated into design guidelines. Specifically,
  
  this project focused on identification of in-situ cable dynamic properties and performance of external viscous dampers
  
  on the Penobscot Narrows Bridge. Forced vibration tests were conducted on the stay cables during the latter stages of
  
  construction, just prior to and following installation of viscous dampers. Cable properties, such as vibration frequencies
  
  and damping levels, were established and compared with design targets.
  
  
• Format:
  PDF
• Funding:
  DTFH61-07-D-00034
• Collection(s):
  Federal Highway Administration US Transportation Collection
• Main Document Checksum:
  urn:sha-512:c8ca62310b2b00c88bd0eb92299b71d0a9fbd63366ab824467666b26da2ecfc6918f64af34b7ebca530bdba94f92fdec42fd65d1dd731dce4c6ed888c24d39b0
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/28049/dot_28049_DS1.pdf
• File Type:
  [PDF - 10.15 MB ]