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Main Street Bridge (Hillsboro, Oregon)
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Main Street Bridge (Hillsboro, Oregon) : ウィキペディア英語版
Main Street Bridge (Hillsboro, Oregon)

The Hillsboro Main Street Bridge is a tied concrete arch bridge located in Hillsboro, Oregon. The bridge carries light rail traffic on the MAX Blue Line over Main Street and 18th Street. Completed in 1997, the long bridge was built with a tall arch in the center. It is located between the 12th Avenue Station and the Fair Complex Station.
==Design==
The bridge is a post-tension box girder structure with the center pier as an arch support straddling the road.〔Cortright, Robert. 2003. ''Bridging the World''. Wilsonville, Or: Bridge Ink.〕 Used in lieu of a center support, the arch is wide〔 and tall.〔Arch support for Tri-Met extension; engineers in Hillsboro, OR constructed a high concrete arch over a roadway without using a center support, so that the arch can support bridge cables for the light rail overpass; Transit Update. ''Railway Age'', November 1997 No. 11, Vol. 198; Pg. 27; ISSN: 0033-8826〕 Six cables measuring four inches (102 mm) in diameter run from the arch to the main structure of the bridge at the center.〔 The two ends of the reinforced concrete arch are connected to each other underground using a post-tension tie beam, making the structure a tied arch.〔

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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