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Re: pedestrian suspension footbridge

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A '50's era suspension foot bridge that I was involved with a while ago had
a similar problem with lateral stiffness. The deck itself was pretty
flimsy, and there where these big ol' cables that arched in a horizontal
plane which gave the structure its lateral stiffness.

Before you start work, have a look at the film footage of the final moments
of the Tacoma Narrows Bridge. Don't let that be you.

Michael Ludvik, PE




                                                                           
             "S. Gordin"                                                   
             <scgordin@hotmail                                             
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             09/14/2004 04:31                                           cc 
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                                                                   Subject 
                                       Re: pedestrian suspension           
             Please respond to         footbridge                          
             <seaint(--nospam--at)seaint.or                                             
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Joe,

Watch for the lateral deflections - 36" wide seems too narrow for 100 ft
long...
You may have to stiffen it quite a bit.
Look at the Continental Bridge website or call them.


Steve Gordin


 ----- Original Message -----
 From: Joe Grill
 To: seaint(--nospam--at)seaint.org
 Sent: Tuesday, September 14, 2004 9:46 AM
 Subject: pedestrian suspension footbridge

 I have been ask to look into the possibility of using a suspension bridge
 for foot traffic across a creek.  It will be a private bridge.  The owner
 is interested in a suspended system.

 I told him it was probably feasible, but I had to look into the design
 before I decided if I should be doing it.  I doesn’t seem like it should
 be a problem though.

 Are there any design references out there for this sort of thing?  It
 would be something you might see as a trail crossing in a forest and will
 have a span of about 110’ and a 3’ wide deck.

 Thanks,
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