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Message - pretty shape

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Posted by  randy on December 05, 2002 at 16:13:14:

In Reply to:  Floating Bridge posted by Per Corell on November 30, 2002 at 02:11:23:

The pretty shape of your bridge ignores the forces and that it you should be designing for. Try to find a "elegant" solution which address the structural performance issues and is pretty. Also the elegant curve is mostly under water (invisible) and the walls above water seems to have no point except to block the nice maritime views of the drivers.

- The primary force that it has to deal with is the current - which one would assume to be crossing it. the wing like shape that you made would probably drag and twist (Think of a kayak - it's fun to play perpendicular to the current but BECAUSE the boat wants to roll over.)

Think of the incredible forces that building a dam for 6 feet of running water would creat and then imagine how you transfer the load to the banks. Should you curve it up stream like a dam?

Id guess the best shape would be more like a series boats facing upstream rather than across. (old roman stratagie)

- Floating debris would build up against it on the upstream side. and because of the shape would get shoved under the leading edge where it would be nearly impossible to remove. I would think that at least small/ medium debris should be able to float by, or else maintainance costs would out weigh the cheaper construction of a pontoon.

- Standard pontoon limitation - how do boats (even little one) get by.

- the elegant curve is mostly under water (invisible) and the walls above water seems to have no point except to block the nice maritime views of the drivers.

 
 
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