To: "'seaint(--nospam--at)seaint.org'" <seaint(--nospam--at)seaint.org>
Subject: RE: seaint Digest for 11 Jun 2001
From: "Murphy, Thomas P" <TPMurphy(--nospam--at)Modjeski.com>
Date: Wed, 13 Jun 2001 08:04:29 -0400
I have found that dynamic problems are best dealt with by using
dynamic solutions. The "trouble" range of natural frequencies for
pedestrian bridges is generally 1.5 to 3 Hz, and I think you'll find that
the additional stiffness you need to move your bridge out of this range will
be expensive. I think your best bet is to look into tuned mass dampers.
That is what is being used to fix the millenium bridge in London. Hope that
Thomas P. Murphy, Ph.D., P.E.
From: "Benz non" <chanonb(--nospam--at)hotmail.com>
Subject: Pedestrian bridge vibration and strengthening
I would like to ask for your comments on how to solve a man-induced
vibration on a pedestrian bridge.
The bridge is 30-m long, steel-truss pedestrian bridge with nearly 2 Hz
natural frequency and very light damping.
We are considering strengthening method but we are lacking of experience.
Installation of dampers is one of the solution but we want to know whether
strengthening works or not.
Other solutions are appreciate.
Thanks for sharing
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