Criteria for Restoration of Longitudinal Barriers, Phase II

National Academies of Sciences, Engineering, and Medicine

doi:10.17226/26321

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Criteria for Restoration of Longitudinal Barriers, Phase II

(2021)

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Guardrails are an important feature of the roadside that are used to shield errant motorists from becoming involved in even more catastrophic crashes by redirecting vehicles away from fixed hazards such as trees and poles and terrain hazards such as steep roadside slopes and fill embankments.

The TRB National Cooperative Highway Research Program's NCHRP Web-Only Document 304: Criteria for Restoration of Longitudinal Barriers, Phase II develops a Field Guide to assist maintenance personnel in making decisions about repairing damaged guardrail installations.

Supplementary material to the document is Appendices A-S.

Contributor(s): National Academies of Sciences, Engineering, and Medicine; Transportation Research Board; National Cooperative Highway Research Program; Chuck A. Plaxico; Malcolm H. Ray; Christine E. Carrigan; T. Olaf Johnson; Archie Ray

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National Academies of Sciences, Engineering, and Medicine. 2021. Criteria for Restoration of Longitudinal Barriers, Phase II. Washington, DC: The National Academies Press. https://doi.org/10.17226/26321.

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480 pages | 8.5 x 11 | DOI: https://doi.org/10.17226/26321

Chapters		skim
Front Matter	i-xxx
Chapter 1. Introduction	1-5
Chapter 2. Summary of Common Non-Proprietary Guardrails	6-27
Chapter 3. Literature Review	28-68
Chapter 4. Survey of Practice	69-70
Chapter 5: Prioritization of Damage Modes	71-104
Chapter 6. General Research Approach	105-108
Chapter 7. Development and Validation of the G4(2W) Guardrail Model	109-154
Chapter 8. Evaluation of the Guardrail Post Deterioration for the G4(2W)	155-229
Chapter 9. Effects of Anchor Strength on Performance of the G4(2W)	230-254
Chapter 10. Combination Damage Mode of Rail Deflection and Rail-Post Connection for the G4(2W)	255-270
Chapter 11. Re-Assess Cause of Failure in Test C08C3-027 for the Modified G4(1S) with Pre-Crash-Induced Deflection	271-302
Chapter 12. Effects of Soil Erosion at Guardrail Posts for the G4(2W)	303-339
Chapter 13. Anchor Strength Quantified in Terms of Anchor Damage	340-374
Chapter 14. Effects of W-Beam Splice Damage on Rail Capacity	375-410
Chapter 15. Development of Field Guide Materials and Field Testing	411-416
Chapter 16. Field Guide Application Examples	417-436
Chapter 17. Conclusions	437-439
References	440-449

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Criteria for Restoration of Longitudinal Barriers, Phase II

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