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Ohio has a high wind and snow area on a causeway where box
|Date||June 7, 2016|
|Attachment||box beam rail picture.JPG|
I have replied to you questions regarding box beam barriers below in red.
This system appears to
be common in New York and Wyoming. Do you know the status of
this system as far as MASH compliance?
With respect to the 1100C vehicles, recent cable barrier testing with S3x5.7 posts have shown a potential for laceration and penetration of the vehicle floorboard by the free edges of the post. According to MASH, this is sufficient cause for failure of the test based on penetration of the occupant compartment. To the best of our knowledge, this has not been evaluated through MASH testing of box beam with the 1100C vehicle.
Because box beam is a weak post guardrail system, the main resistive force and energy absorption is derived from yielding and deformation of the post. Weak post systems typically depend much less on displacement of the post through soil. As such, cable barrier systems commonly have substituted sockets in place of deeper embedment posts or soil plates and demonstrated similar behavior. In terms of box beam guardrail, there is some potential that the use of as socketed foundation could alter post deformation and deflection slightly, and we have not observed this practice used box beam in any past crash tests. However, based on the performance of cable barrier systems with sockets, it would seem that the performance of a socketed post box beam system would be very similar to a standard system with posts and soil plates.
|Date||June 8, 2016|
130 Whittier Research Center
2200 Vine Street
Lincoln, NE 68583-0853
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