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Bridge Guardrail

Question
State MO
Description Text

Can you
tell me if the MoDOT thrie beam guardrail on BRIDGE using a W6x20 post at 6’-3”
spa. with or without W6x15 steel blockout is acceptable for MASH TL-3?



 



I believe
our current system is NCHRP 350 TL-3 compliant which can be utilized with or
without
a steel blockout.



 



Gregory
Sanders, P.E.



Structural
Development and Support Engineer



Missouri
Dept. of Transportation

Keywords
  • Bridge Rails
Other Keywords none
Date December 27, 2017


Response
Response

I believe that the bridge railing system was crash tested under the NCHRP Report No. 230 criteria. Unfortunately, I am unaware of any crash testing under NCHRP Report No. 350 on this exact bridge railing. There may have been a grandfather from 230 to 350** on this bridge railing.

 

**Memorandum on Crash Testing of Bridge Railings, May 30, 1997, File Designation HNG· 14, Federal Highway Administration (FHWA), Washington. D.C ., 1997.

 

MASH testing would be recommended for the bridge railing.

 

The approach guardrail transition (AGT) was largely crash tested under NCHRP 350 and MASH using the Test Level 3 safety performance criteria. The various transition testing programs on similar systems are attached below.

 

Successful 350 Testing on Similar AGT

https://mwrsf.unl.edu/researchhub/files/Report87/TRP-03-71-01.pdf

 

Failed 2000P & Passed 820C – Original AGT & Transition Element

https://mwrsf.unl.edu/researchhub/files/Report188/TRP-03-94-00.pdf

 

Failed 2000P & Failed 2000P – Modified AGT w/ Rubrail

https://mwrsf.unl.edu/researchhub/files/Report186/TRP-03-91-99.pdf

 

New Transition Element R&D

https://mwrsf.unl.edu/researchhub/files/Report108/TRP-03-167-07.pdf

 

New Transition Element and Standardized AGT – MASH Testing

https://mwrsf.unl.edu/researchhub/files/Report38/TRP-03-210-10.pdf

 

New Standardized AGT w/ Curb – MASH Testing

https://mwrsf.unl.edu/researchhub/files/Report295/TRP-03-291-14.pdf

 

 

Date January 2, 2018
Attachment MoDOT Midwest MASH Transition Section.pdf


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