Logged in as: Public User

Bolts in asymmetrical transition section

Question
State IA
Description Text

When testing, does MwRSF use two bolts for the center post of the asymmetrical section or just one? I would default to assuming two or there wouldn’t be a need to have the bottom hole, but I’ve seen other states with just one in the top slot and I can’t find a definitive answer.

 

I’ve seen some drawings where there will be a nail near the bottom hole to prevent rotation with a wood blockout and wood post but since MwRSF typically tests with steel posts, that wouldn’t apply. However, I’m not sure if the nail would be needed as it would be a thrie-beam blockout and the weight distribution may keep the blockout from rotating anyway. Thoughts?

Keywords
  • Approach Guardrail Transitions
Other Keywords none
Date July 12, 2016


Response
Response

All of the MASH testing of the the asymmetrical W-to-thrie beam transition piece was conducted with only the top post bolt installed. This was done  partially because standard thrie beam posts will not have a post bolt hole in the correct location for the lower slot in the rail, and to allow for the blockout in that location to rotate and reduce snag. Thus we would recommend using only the single bolt in that location.

 

We don’t have evidence that using both bolts is an issue, but we recommend using only the top bolt to be consistent with the full-scale crash tests.

 

Date July 13, 2016


Contact Us:
130 Whittier Research Center
2200 Vine Street
Lincoln, NE 68583-0853
(402) 472-0965
Email: mwrsf@unl.edu
Disclaimer:
The information contained on the Midwest Roadside Safety Facility (MwRSF) website is subject to change without prior notice. The University of Nebraska and the MwRSF is not responsible or liable, directly or indirectly, for any damage or loss caused or alleged to be caused by or in connection with the use or misuse of or reliance upon any such content, goods, or services available on this site.