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Summary of Maximum Deflections for Beam Guard and Thrie Beam

State WI
Description Text

I was looking at the deflection values in Table 5.4 of the RDG (page 5-25).  I'm confused where these deflection values are measured from.  Are they deflection values or working width (e.g. barrier width plus deflection).  If they are just deflection do I just and the width of the system to get working width?

  • Guardrail
Other Keywords none
Date January 29, 2009


The values in the table come from several sources. To the best of my knowledge, the simulations were performed by Kitty Hancock using the NARD code. At the time of this analysis, our industry was not yet using the working width terminology. As such, I believe that the simulation results just depict dynamic deflections. Some crash test results are also referenced in the table. These MwRSF tests were also very dated. As such, dynamic deflections were likely used as well.

Date February 2, 2009

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