United States Department of Transportation
i
Design and Performance of Highly Skewed Deck Girder Bridges [Research Brief]
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2018-10-01
[PDF-277.60 KB]
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Abstract:Bridge skew is the angle between a line perpendicular to a superstructure and its supports. Highly skewed bridges are more complex and pose more challenges than bridges that pass perpendicularly over the road or other features below it. Skew alters distribution of loads from deck to girders. It can cause large deformations at girder ends or create stresses in the superstructure. However, as infrastructure demands increase and the amount of undeveloped land decreases, skew is becoming more commonplace in bridge construction. Thirty percent of Wisconsin bridges built between 1995 and 2014 are skewed between 20° and 60°. The goal of this project was to investigate the performance of high-skew bridges in Wisconsin to identify limits for simplified analysis methods, and to evaluate and recommend design details and practices that can mitigate negative impacts of skew on decks and bearings.
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