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eomaha.com
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Posted: Thu Jun 17, 2004 2:24 pm Post subject: |
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A reply from Figg... the bridge engineers...
Dear Jeff,
Thanks for your question regarding the material used on the outside of the stay cables. The proposed material for the Missouri River pedestrian cable-stayed bridge is a high density polyethylene (HDPE) pipe that is manufactured specifically for this application. It is designed to resist the elements encountered by cable-stays in a marine environment. The Post-Tensioning Institute, an industry group that researches and establishes standards for cable-stayed bridges, includes this material in their design recommendations. We have used this a form of this material on other cable stayed bridges, including the Varina-Enon Bridge near Richmond, VA, the Veteran's Memorial Bridge over the Neches River, in Texas and the Clark Bridge near St. Louis, MO. The newest generation of this material, which is what is also proposed for the pedestrian bridge, was used on the new Charles River Bridge in Boston, MA that opened to traffic last year. The material is designed to have a design life similar to the bridge design itself - 100 years. The HDPE pipe provides a protective outer coating for the stay cables. Internally, each steel strand is also coated with epoxy to protect it. Jeff, I hope that this information is useful to you.
Cheryl Maze
Director of Lasting Impressions
FIGG
The Charles River Bridge... part of Boston's 'Big Dig'

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