TENSION LOSS IN CABLE GUIDERAIL. FINAL REPORT

Cable guiderail with insufficient tension may deflect excessively on impact, allowing vehicles to contact fixed objects behind the barrier. The Department's 1979 Highway Safety Review indicated that almost every cable guiderail installation observed had insufficient tension. Research Project 166-1 was initiated to examine this problem. This report describes the second phase of that study to investigate causes of tension loss and formulate corrective measures. Several changes had already been made, based on results of the study's first phase. Construction specifications and standard sheets were changed to ensure proper soil compaction and better initial and long-term cable tension. Field performance of selected improved guiderail installations was documented from 1984 to 1987. In addition, prestressed cable was used in some projects in 1985 to investigate its effectiveness in reducing tension loss due to cable stretch. Laboratory stretch tests were conducted using normal and prestretched cable to determine any significant differences appearing in cable strain due to long-term loading. Results from field and laboratory tests indicated that cable installations continually lose tension and need to be retensioned periodically, and that substituting prestretched for normal cable in guiderail installations does not reduce the tension-loss problem.

  • Supplemental Notes:
    • Study title: Cable Guiderail Tension.
  • Corporate Authors:

    New York State Department of Transportation

    Engineering Research and Development Bureau, 1220 Washington Avenue
    Albany, NY  United States  12232

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Yang, W-S
    • Bruno, N J
    • Kenyon, W D
  • Publication Date: 1992-3

Language

  • English

Media Info

  • Pagination: 25 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00720040
  • Record Type: Publication
  • Source Agency: Federal Highway Administration
  • Report/Paper Numbers: FHWA/NY/SR-92/104, NCP 4A5B1152, Res Proj 166-1
  • Files: TRIS, USDOT, STATEDOT
  • Created Date: Apr 2 1996 12:00AM