United States Department of Transportation
i
Nondestructive Evaluation of T-1 Steel in the Sherman Minton Bridge
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2024-03-01
[PDF-2.48 MB]
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Edition:Final Report
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Abstract:The purpose of this document is to provide information to bridge owners on previous experience in conducting nondestructive testing (NDT) for a highway bridge constructed with American Association of State Highway and Transportation Officials M 270/M 244 (ASTM A514/517) 100 kilopounds per square inch steel.(1–4) These types of high-strength steel have been affected by hydrogen-assisted cracking, which may occur during the fabrication process because of uncontrolled hydrogen levels in the weld. The occurrence of hydrogen-assisted cracking in high-strength steels has led to several bridge closures to address cracking or fracture of nonredundant steel tension members (NSTMs), previously known as fracture critical members. The objective of this report is to present the results and an analysis of results from the NDT inspection of the Sherman-Minton Bridge, which was affected by hydrogen-assisted cracking in its NSTM tie girder. The report documents the results of performance testing by NDT inspectors working on the bridge. Researchers analyzed the correlation between NDT results and physical samples (cores) removed from the bridge and reported on the overall finding from the NDT inspection of butt welds in the bridge. These data are intended to inform bridge owners of the performance of NDT technologies applied in the field.
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