United States Department of Transportation
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Edition:Final Report
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Abstract: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.
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