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Citation |
Sicking DL, Mak KK, Wilson WB. Transp. Res. Rec. 1994; 1468: 60-67. |
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Copyright |
(Copyright © 1994, Transportation Research Board, National Research Council, National Academy of Sciences USA, Publisher SAGE Publishing) |
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DOI |
unavailable |
PMID |
unavailable |
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Abstract |
A crashworthy terminal for box-beam guardrails was developed and successfully crash tested. The terminal incorporated a telescoping tube configuration with a 7-in. x 7-in. x 1/8-in. (178-mm x 178-mm x 3.2-mm) outer tube placed over the standard 6-in. x 6-in. x 3/16-in. (152-mm x 152-mm x 4.8-mm) box-beam rail element. A breakaway post and cable mechanism, similar to that used with the breakaway cable terminal, was used at the end of the terminal to provide anchorage for downstream impacts. An impact head attached to a short segment of a 6-in. x 6-in. x 3/16-in. (152-mm x 152-mm x 4.8-mm) box beam was inserted into the upstream end of the outer tube. The impact head serves to capture impacting vehicles, and the short tubular element slides back into the outer tube to allow the lead wood post to break away. A breakaway tensile connector similar to that used in the ET-2000 terminal was incorporated to transmit tension between the two telescoping tubes without adversely affecting system compression. Pultruded glass/polyester fiber-reinforced plastic tubes were inserted inside the telescoping steel tubes to provide energy dissipation. Full-scale crash testing demonstrated that this telescoping tube terminal for box-beam guardrails met safety standards set forth in NCHRP Report 230. Language: en |
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Keywords |
Accident prevention; Highway accidents; Installation; Testing; Crashworthiness; Standards; Performance; Highway systems; Guard rails; Roadsides |