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.
- Study title: Cable Guiderail Tension.
Albany, NY United States 12232
Washington, DC United States 20590
- Yang, W-S
- Bruno, N J
- Kenyon, W D
- Publication Date: 1992-3
- Pagination: 25 p.
- TRT Terms: Cables; Improvements; Laboratory tests; Median barriers; Performance; Prestressing; Tension; Tension tests
- Uncontrolled Terms: Cable guardrails; Field performance; Stretching
- Old TRIS Terms: Tension loss; Test results
- Subject Areas: Design; Highways; Safety and Human Factors; I85: Safety Devices used in Transport Infrastructure;
- 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