TL-1 Curb-Type Bridge Railing for Longitudinal Glulam Timber Decks Located on Low-Volume Roads
Ronald Faller, Ketil Soyland, Barry Rosson, Tyler Stutzman
A low-height, curb-type timber bridge railing was developed for use on longitudinal timber bridge decks located on low-volume roads. A 6 3/4-in. x 10 1/2-in. (171-mm x 267-mm) curb rail was supported by timber scupper blocks spaced on 10-ft (3048-mm) centers. The height to the top of the railing was 17 3/4 in. (451 mm). The research study included 6 static tests and one full-scale vehicle crash test. The curb-type bridge railing successfully redirected a 3/4-ton pickup truck impacting at a speed of 31.3 mph (50 km/hr) and at an angle of 25 degrees. The safety performance of the bridge railing was acceptable according to the Test Level 1 (TL-1) evaluation criteria described in the National Cooperative Highway Research Report No. 350, Recommended Procedures for the Safety Performance Evaluation of Highway Features.
Highway Safety, Roadside Safety, Guardrail, Longitudinal Glulam Timber Deck, W-beam, Bridge railing, Low-volume, Top-mounted, NCHRP -350, TL-1, Crash test
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