United States Department of Transportation
i
Cable-to-post attachments for a non-proprietary high-tension cable barrier - phase II.
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2015-06-01
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[PDF-19.43 MB]
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Abstract:The research objectives reported herein were based on further development of cable-to-post attachment hardware for use in
the non-proprietary high-tension cable barrier system. Specifically, this project aimed to develop and evaluate alternative
attachment designs for the bolted, tabbed bracket and evaluate the use of a larger diameter, keeper rod for use in the top
cable attachment.
From a group of over 25 alternative attachment concepts, two tabbed bracket designs were selected for evaluation through
dynamic component testing: 1) the lateral shear plate attachment and 2) the drop-in shear plate attachment. The drop-in
shear plate concept did not perform as intended, as the vertical release load was too high and the lateral release loads were
too low. Alternatively, the lateral shear plate design provided vertical and lateral release loads very similar to the original
bolted, tabbed bracket V10. However, concerns were raised over the lack of rigidity in the attachment and the ease of
installations of the shear plate. Thus, it was recommended that the lateral shear plate design be modified and reevaluated
prior to use in the full-scale system.
Dynamic bogie or component testing of the 3/16-in. (4.8-mm) diameter brass keeper rod provided a quick cable release
similar to the previous design. The increased strength of the rod also showed promise in distributing impact loads more
uniformly to adjacent posts and helping reduce system deflections. Thus, the 3/16-in. (4.8-mm) diameter brass rod was
recommended for use in the new high-tension cable barrier system
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