CRASH TESTING AND EVALUATION OF ATTENUATING BRIDGE RAILING SYSTEM
The results of the analysis (using computer program BARRIER IV) of an idealized vehicle barrier system indicate that the barrier which was designed to prevent penetration by a standard-size automobile weighting 4,000 to 5,000 lb and impacting at 25 deg. and 65 mph, would meet the desired criteria. A key feature of this steel bridge rail design is the function of the attenuator that supports the two rails of gectangular structural tubing. It is designed to absorb energy as it deforms on impact; the resisting force builds up, yeilds plastically and remains at a relatively constant level around 13 kips through about 36 in. of deformation. Three full-scale vehicle crash tests were conducted and the results are summarized in a table. Two attenuators were subjected to static force-deformation tests to document their energy absorbing characteristics, and to dynamic pendulum tests for the same purpose. Although attenuator design does not meet current AASHTO specifications, the railings may be exempted from conforming because they have been successfully tested by full-scale impact tests. The attenuating bridge railing concept is concluded to be a very attractive simple system providing excellent driver visibility, and is recommended for immediate application.
- Digital Copy:
- Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.
Washington, DC United States 20001
- Publication Date: 1976-1
- Media Type: Digital/other
- Features: Figures; Tables;
- Pagination: 10 p.
- NCHRP Research Results Digest
- Issue Number: 81
- Publisher: Transportation Research Board
Open Access (libre)
- TRT Terms: Analysis; Barriers (Roads); Bridge railings; Computer programs; Crash cushions; Crashes; Drivers; Dynamic tests; Energy absorption; Evaluation; Impact tests; Specifications; Static tests; Steel rails; Structural engineering; Testing; Tubing; Vision
- Uncontrolled Terms: Barriers
- Old TRIS Terms: Driver vision
- Subject Areas: Bridges and other structures; Highways; Research; Safety and Human Factors;
- Accession Number: 00131354
- Record Type: Publication
- Files: TRIS, TRB
- Created Date: May 14 1976 12:00AM