United States Department of Transportation
i
Enhancement of welded steel bridge girders susceptible to distortion-induced fatigue.
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2014-10-01
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[PDF-1.94 MB]
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Abstract:The goal of this study was to develop and evaluate the performance of retrofit techniques for existing steel
bridges that have already sustained damage due to distortion-induced fatigue, or are anticipated to experience
distortion-induced fatigue cracking within their design life. A second goal was to evaluate the use of new
technologies and materials for repairing distortion-induced fatigue damage in steel bridges.
While a number of retrofit techniques exist for repairing distortion-induced fatigue cracking, many of
them require partial or full bridge closure to perform the repair. The retrofits developed under this project are
intended to be able to be installed with minimal disturbance to traffic. Four primary subject matters are
reported on within this document: (1) the development of the “angles-with-plate” distortion-induced fatigue
repair; (2) development of fiber reinforced polymer (FRP) repairs for distortion-induced fatigue and in-plane
fatigue; (3) development of Piezoelectric Induced Compressive Kinetics (PICK) technology for treatment of
crack-arrest holes; and (4) a series of analytical investigations aimed at better understanding distortion-induced fatigue susceptibility of skewed bridge systems.
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