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Long continuous bridge deck evaluation : John Day River Bridge, Clatsop County, Bridge No. 1827B : final report.
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1995-06-01
[PDF-1.89 MB]
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Alternative Title:Long continuous bridge deck evaluation : John Day River Bridge.
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Abstract:The John Day River Bridge, near Astoria, Oregon was built with a continuous deck length of 1,105 ft. (340 m). The rationale for designing the John Day River Bridge with an unusually long continuous deck is in part based on the site's very mild climate. Overall temperature changes in the deck are in the range of 50 F (28 C). The objective was to monitor and evaluate the impacts which may result from expansion, contraction, or shrinkage of the bridge deck. This bridge has shown no significant sign of distress which may be related to expansion/contraction of the bridge deck. Deck measurements show that the bridge has not expanded or contracted more the anticipated amount.
In the future, if the long continuous bridge deck design is considered, recommendations includes: 1) locating the bridge on stable fill, 2) providing for controlled cracking, and 3) providing for expansion, contraction or shrinkage between the bridge and the impact panels.
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