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ASSESSMENT OF ULTRA-HIGH TOUGHNESS STEEL FOR HIGHWAY BRIDGES
Wagley, Sulok
Wagley, Sulok
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Abstract
Two- and three-girder bridge systems offer initial cost benefits, but federal regulations classify many of their elements as nonredundant steel tension members (NSTM), formerly called as fracture critical (FC) members, due to concerns over potential failures. This NSTM status necessitates costly biennial "arm’s length" inspections to mitigate fracture risks. In search for alternatives, ultra-high toughness (UHT) steels have emerged as promising candidates, potentially eliminating the need for the NSTM classification. In the current study, three distinct UHT steels were identified for evaluation. The initial phase of the research involved evaluating the effect of interpass temperature on weld metal behavior. This was followed by the initial material characterization, where Charpy V-Notch (CVN) impact tests were conducted on the base metal, weld metal, and heat-affected zone of each steel to assess their impact toughness. The findings from the CVN tests of the candidate steels have been documented, shedding light on the material’s behavior and its potential for future bridge constructions. This investigation sets the groundwork for further in-depth research into the broader applications and benefits of UHT steels in bridge systems.
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2023-12-31
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University of Kansas
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Wagley_ku_0099M_19209.pdf
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Keywords
Civil engineering, Toughness, Welding, Heat-Affected Zone, Fracture, Charpy V-Notch Impact Energy