Fatigue Strength of Deteriorated Steel Highway Bridges
Publication: Journal of Structural Engineering
Volume 116, Issue 10
Abstract
The effect of long‐term environmental exposure and an extended history of highway loading was quantitatively determined for steel bridge beams that had been in service more than 50 years. Fatigue tests were conducted on specimens removed from the tension flange of truss stringers salvaged from four bridge replacement projects. Based on the fatigue strength reduction factor determined on a basis of mean fatigue life for all specimens in one bridge, the fatigue sensitivities encountered were less than that associated with an AASHTO Category C welded connection detail. For individual specimens, the maximum value determined was 3.0. At 36‐ksi (248‐MPa) stress range, average specimen lives exceeded 300,000 cycles for all bridges, for both center‐span (maximum prior stress history) and near‐support (insignificant prior stress history) specimens. The corrosion deterioration experienced by the plain (nonwelded) simple‐span steel bridge beams in this study caused the average fatigue strength to be reduced by approximately one AASHTO fatigue category.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 116 • Issue 10 • October 1990
Pages: 2671 - 2690
Copyright
Copyright © 1990 ASCE.
History
Published online: Oct 1, 1990
Published in print: Oct 1990
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