United States Department of Transportation
i
Repair of distortion-induced fatigue damage in bridge no. 135-87 (043SB and 044NB) using newly-developed strengthening schemes : summary.
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2016-08-01
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[PDF-468.24 KB]
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Abstract:A steel girder twin bridge structure located near Park City, Kansas, has experienced
extensive distortion-induced fatigue cracking in its web-gap regions. Due to
the bridge’s skewed, staggered configuration, the majority of these cracks have
occurred in the bottom web-gap region. The bridge was previously the subject of
a series of detailed finite element analyses that investigated the effectiveness of
several types of retrofits in repairing its distortion-induced fatigue cracks. One of
these retrofits, the “angles-with-plate” retrofit, was developed and tested at the
University of Kansas as a new retrofitting technique aimed at providing a more
economical and easy-to-install distortion-induced fatigue cracking repair. The
retrofit is made up of a pair of angles and a backing plate that connect the crossframe
connection plate and girder web in order to stiffen the web-gap region.
Results from the finite element analyses determined that the angles-with-plate
retrofit was the most effective and economical choice for repairs in the bridge,
and plans were made for its installation.
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