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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"                                                   
             .com>                                                      To 
             09/14/2004 04:31                                           cc 
                                       Re: pedestrian suspension           
             Please respond to         footbridge                          


Watch for the lateral deflections - 36" wide seems too narrow for 100 ft
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)
 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.

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