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Galvanizing Effect on the Fatigue Performance of Sign and Signal Socket Connection Details

Project Information

Project ID: 
FHWA-PROJ-07-0014
Project Status: 
Active
Start Date: 
Sunday, July 1, 2007
End Date: 
Friday, August 1, 2014
FHWA Program: 
Infrastructure
FHWA Subprogram: 
Structures
FHWA Topics: 
Roads and Bridges--Structures
TRT Terms: 
Fatigue (Mechanics); Fatigue Cracking; Galvanizing; Tubular Structures; Traffic Signs; Infrastructure; Materials; Steel Bridges
FHWA Discipline: 
Structures
TRB Subject Area: 
Bridges and other structures, Research

Contact Information

First Name: 
Justin
Last Name: 
Ocel
Telephone: 
(202) 493-3080
Email Address: 
Team: 
Bridge Engineering Team
Office:
Office of Infrastructure Research and Development
Office Code: 
HRDI-40

Project Details

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.

Goals

To quantify the reduction in fatigue strength of welded tube-to-plate socket connections from galvanization. 

Deliverables

Deliverable Name: 
WORKING TITLE - "Fatigue Testing of Galvanized and Ungalvanized Socket Connections."
Deliverable Type: 
Technical report
Deliverable Description: 
The report will cover the methodology of the overall research, data collected, and interpretation of that data.