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Criteria for Restoration of Longitudinal Barriers (2010) / Chapter Skim
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Pages 78-83

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From page 78...
... 15.1 Summary of Current Practices Current practices and research needs were determined based upon the results of a literature review and a survey of State and Canadian Provincial transportation agencies. A literature review on the repair and maintenance of longitudinal barriers revealed the following: • There appears to be no scientific basis for the existing national guardrail repair guidelines.
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From page 79...
... Depending on individual conditions at a specific site, however, the probability of a second impact to a previously damaged longitudinal barrier will vary considerably. The determination of the risk of a second collision is beyond the scope of this document but should be another factor that 79 Damage Mode Pendulum Tests Full-Scale Crash Tests Finite Element Modeling Rail / Post Deflection x x x Vertical Tear x Horizontal Tear x Twisted Blockout x Missing Blockout x Splice Damage x Hole in Rail x Missing Posts x Post-Rail Separation x Rail Flattening x Generic End Terminal Damage Table 29.
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From page 80...
... . 15.3.3 Guidance for Substantial Barrier Damage National guidance regarding the repair of w-beam barriers is provided by the Federal Highway Administration (FHWA)
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From page 81...
... Summary of W-Beam barrier repair threshold guidelines. (continued on next page)
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From page 82...
... B 2 or fewer posts are broken or separated from the rail element.
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From page 83...
... The finite element modeling was applied to only some of the damage types, and if extended to other damage modes could yield further insight into the crash performance of damaged barriers. • Conduct additional full-scale crash tests of damaged longitudinal barriers both as a means to evaluate the crash performance of these systems, and to provide an additional source of finite element model validation data.
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Key Terms

  • beam barrier
  • guardrail repair
  • damage type
  • x rail
  • barrier repair

  • rail element
  • literature review
  • national guardrail
  • beam barriers
  • longitudinal barriers

  • transportation agencies
  • barrier damage
  • crash test
  • rail flattening
  • guardrail model

  • posts missing
  • finite element
  • quantitative guidelines
  • severe barrier
  • repair criteria

  • repair priority
  • responding agencies
  • repair guidelines
  • cable barrier
  • repair guidance

  • broken posts
  • nchrp report
  • tear x
  • bearing plate
  • require repair


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