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PMSS Project Details


Project ID:FHWA-PROJ-07-0014
Project Name: Galvanizing Effect on the Fatigue Performance of Sign and Signal Socket Connection Details
Status: Active
Last Name:Ocel
First Name:Justin
Office: Office of Infrastructure Research and Development
Team:Bridge and Foundation Engineering Team
Roadmap/Focus area(s): Infrastructure Research and Technology Strategic Plan and Roadmap
Project Description:In 2007, a failed Virginia cantilevered sign pole was forensically investigated at Turner-Fairbank Highway Research Center. The investigation yielded inconclusive results, but evidence of zinc on the fracture surface raised a suspicion that a crack may have been preexisting from fabrication. In discussions with industry experts, there appeared to be a growing problem in the United States with hot-cracking or liquid metal embrittlement. This project was a first step to addressing the concern that began to define the reduction in fatigue strength due to galvanizing of socket connection details. The project fatigue-tested 24 socket connection details from two different fabricators. Both bare and galvanized specimens were tested from each fabrication source.
Laboratories: Structures Laboratory
Start Date: July 1, 2007
End Date: August 1, 2014
Goals:The key project objective was to quantify the reduction in fatigue strength of welded tube-to-plate socket connections from galvanization.
Test Methodology: Full-scale experimental
Expected Benefits:More robust fatigue design guidelines for ancillary sign structures
Deliverables:Name: Final report.
Product Type(s): Research report, Techbrief
Description: The report will cover the methodology of the overall research, data collected, and interpretation of that data.
Keywords: Fatigue (Mechanics)
Fatigue Cracking
Tubular Structures
Traffic Signs
Steel Bridges
Subject Areas: Bridges and other structures