This report examines the development of two roadside barrier-median barrier systems by computer simulation. The systems are designated as the Concrete Barrier with Blockedout W Rail and the Thrie T Barrier (TTB). Both systems are designed for impacts by vehicles ranging from 2250 lb (1020 kgm) to 40,000 lb (18.140 kgm). In addition, the concrete barrier with a blockedout W rail was investigated for impacts by vehicles in the 1650 lb (750 kgm) category. Both barriers are sufficiently developed for full-scale testing. The concrete barrier with a blocked out W rail was designed as a rail attached to a vertical wall blocked out with a reusable unit which acts as a one-way spring. The rail was also designed to be attached to a safety shape. The simulation results indicate that the rollover probability of a lightweight narrow wheelbase vehicle impacting a safety shape with a blockedout W rail is significantly reduced when compared to impacts of the some vehicle with a plain safety shape. The TTB was developed by strengthening the European Neher-SWOV barrier. The TTB is a multiple stage barrier utilizing two thrie beam ribbons rigidly separated by a spacer and attached to a post to form a T. Both barriers appear to be capable of redirecting lightweight vehicle impacts at an intensity reduced from existing systems, and both systems appear to be capable of retaining intercity buses. (FHWA)

Media Info

  • Pagination: 108 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00315055
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: FHWA-RD-79- 65 Final Rpt., FCP 31T3-012
  • Contract Numbers: DOT-FH-11-8796
  • Files: TRIS, USDOT
  • Created Date: Aug 5 1980 12:00AM