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Mixed Guardrail Post Types

Question
State OH
Description Text

I have a question about the deflection of our generic guardrail.  Our current standard allows the use of four different post the 6x8 wood, 8" round wood, W6x9, and W6x8.5 with a rail height at 27.75".  For new construction the contractor must use the same post for the entire guardrail run.  When guardrail is being repaired after a crash contractor have asked if they can mix post types.  Nick Artimovich said this is fine if the deflection distances are close.  Where can I get a copy of the crash test reports for the 8" round wood post or the W6x9 steel post?  Thanks for your time.  

 

Post type                     Deflection

6x8                              2.7'

8" round        

W6x9

W6x8.5                       3'

Keywords
  • Guardrail
Other Keywords none
Date August 19, 2010


Response
Response

NCHRP 350 Testing

 

27¾" rail height, 7.25" round SYP post " 3.7 ft D.D. " 2000P TL-3 test by TTI for Arnold Forest Products

 

27"?? rail height, 6x8 rectangular wood post " 2.7 ft D.D. " 2000P TL-3 test by TTI (G4(2W))

 

27¾" rail height, W6x8.5 steel post w/ 6x8 wood blockout " 3.3 ft D.D. " 2000P TL-3 test by TTI (Modified G4(1s))

Date August 20, 2010


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