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Backing Plate for Thrie Beam Attachment to Concrete Parapet

Question
State WI
Description Text
 WisDOT would like to know if we are required to have a backing plate on the backside of our parapet for our thrie beam transitions.  The plate is 12"x18"x3/8" thick and has hols for the bolts used to connect the thrie beam end shoe.


Approach Guardrail Transitions (AGTs)
Bridge Rails
Road Closure Gates
Thrie Beam Guardrails


Date August 8, 2011
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Attachment 14b20-10 thrie beam v3.pdf
Response
Response
(active) 		These plates have been used in the past to act as a washer and distribute load over areas that may have spalled out on the backside of the parapet. We believe that it is perfectly appropriate to use plate washers for the same application rather than the plate. We have recommended similar washer plates to Iowa. A 2.5"x2.5"x0.375" or 3"x3"x/375" washer plate should work fine
Date August 8, 2011
Previous Views (36) Favorites (0)