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Title: FULL-SCALE VEHICLE CRASH TESTS ON GUARDRAIL-BRIDGERAIL TRANSITION DESIGNS WITH SPECIAL POST SPACING
Accession Number: 00490174
Record Type: Component
Availability: Find a library where document is available Abstract: Full-scale 4,500-pound vehicle impact tests at 60 mph and 25 degrees were conducted on four new guardrail-bridgerail "transition" designs for use in Nebraska in which the first wood post from the bridge end was left out. The post was left out to represent a common field problem in which a concrete footing prevents installing the post. To compensate for the missing post, a stronger beam member and heavier wood posts were used in addition to a 4:1 tapered end on the concrete bridgerail. The tapered end was used to (1) reduce the unsupported span length and (2) provide a smooth guardrail deflection curve during vehicle redirection. All of the transition designs were identical except for the transition beam member. The designs consisted of two heavy 10 inch x 10 inch posts followed by four heavy 8 inch x 8 inch posts. The remaining posts were standard 6 inch x 8 inch posts. Over a guardrail length of 18 feet 9 inches, the posts were spaced 3 feet 1.5 inches on centers, whereas, over the remaining length, a standard post spacing of 6 feet 3 inches was used. The posts were installed in a "native" silty clay (type CL) soil. In terms of the evaluation guidelines in National Cooperative Highway Research Program (NCHRP) Report 230, the overall performance of the transition designs was as follows: single thrie beam transition--unsatisfactory, double thrie beam transition--satisfactory, tubular thrie beam transition--satisfactory, double W-beam transition-unsatisfactory.
Supplemental Notes: This paper appears in Transportation Research Record No. 1198, Roadside Safety Features. 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
Monograph Title: Monograph Accession #: 01413999
Authors: Post, Edward RRuby, Richard JRonnau, Dalyce FCress, Milo DPagination: p. 11-30
Publication Date: 1988
Serial: ISBN: 0309047722
Features: Figures
(4)
; Photos; References
(6)
; Tables
(3)
TRT Terms: Uncontrolled Terms: Old TRIS Terms: Subject Areas: Design; Highways; Research; Safety and Human Factors; I85: Safety Devices used in Transport Infrastructure
Files: TRIS, TRB, ATRI
Created Date: Dec 31 1989 12:00AM
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