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:
  • Cable stayed bridges
  • Vibration
  • Wind
  • Rain
  • Serviceability
  • Dampers
  • Hazard mitigation
  • Vibration tests
  • Bridge design
• 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.
  More +
• Format:
  PDF
• Funding:
  DTFH61-07-D-00034
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/28049/dot_28049_DS1.pdf
• File Type:
  [PDF - 10.15 MB]
• Collection(s):
  Federal Highway Administration ; US Transportation Collection
• Main Document Checksum:
  urn:sha-512:c8ca62310b2b00c88bd0eb92299b71d0a9fbd63366ab824467666b26da2ecfc6918f64af34b7ebca530bdba94f92fdec42fd65d1dd731dce4c6ed888c24d39b0