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.
Table of Contents
|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|
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