Since its general nationwide adoption, the standard W-beam or flex-beam has been widely used as a traffic barrier element, its performance has been proved in crash tests and field use. However, the mounting height of the W-beam has been shown to be critical in tests as well as in field installations. Background information in the conception and development of a configuration known as the Thrie beam is presented in this paper along with findings of a crash test series (five test) on this new barrier element. Basically, the Thrie beam can be described as a triple corrugated beam as compared to a double corrugated W-beam. It is 1-1/2 times the width of the W-beam, however, the corrugation geometry, especially the 3-1/4 inch (83 mm) depth, are similar. The crash test series was conducted on blocked-out steel post median barrier and guardrail systems. Test conditions included 4,500 to 2,200-lbs. (2.0 to 1.0 mg) vehicles with speeds ranging 54 to 67 mph (87 to 108 Km/h) and impact angles ranging from 16 to 29 degrees. /FHWA/

  • Supplemental Notes:
    • Study sponsored by FHWA.
  • Corporate Authors:

    Southwest Research Institute

    6220 Culebra Road, P.O. Drawer 28510
    San Antonio, TX  United States  78228-0510
  • Authors:
    • Bronstad, M E
    • Michie, J D
    • Behm, W E
    • Viner, J G
  • Publication Date: 1975-1

Media Info

  • Pagination: 13 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00130607
  • Record Type: Publication
  • Source Agency: Federal Highway Administration
  • Report/Paper Numbers: FHWA-RD-75-509 Intrm Rpt.
  • Files: TRIS, USDOT
  • Created Date: Mar 29 1976 12:00AM