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Thrie beam/Barrier plate attachment

Question
State WI
Description Text

We have some structures people retrofitting thrie beam to sloped end treatments.  Prior to reading the report on retrofitting thrie beam transitions, I was instructing them to put the a connecting plate (see drawing) to get the rail vertical closer to vertical.  I did this based on some crash tests done at TTI.

 

Based on the retrofit research, should they be installing the plates?

 

Is having the plate above the sloped transition an issue (see email and associated attachment below)?

 

Given that our sloped end section and the blunt end section can allow interaction with a vehicle's wheel, should we place something  near the bottom of the barrier to prevent this interaction?

Keywords
  • Approach Guardrail Transitions
Other Keywords none
Date June 19, 2012
Attachment Barrier Detail.pdf


Response
Response

Using the attachment plates to keep the thrie beam vertical is important " we recommend you continue to use them on you installations.  That being said, The attachment plate was not designed for use on sloped end barriers.  Your concerns for snag on that upper corner are justified as previous testing on transitions has shown even small amounts of snag can negatively affect a systems crashworthiness.  My 1st thought to mitigate potential snag issues is to cut the anchor plate to match the slope of the concrete barrier (the 4 5/8" x 7 ½" section detailed in your drawing).

 

I am still looking for the TTI test report of transition hit with the end shoe on the outside of the guardrail " resulting in snag and vehicle rollover.

 

Date June 19, 2012


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