Return to index: [Subject] [Thread] [Date] [Author]

RE: seaint Digest for 11 Jun 2001

[Subject Prev][Subject Next][Thread Prev][Thread Next]
Chanon:
	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
helps,

	
Thomas P. Murphy, Ph.D., P.E.
Harrisburg, PA

-----Original Message-----
From: "Benz non" <chanonb(--nospam--at)hotmail.com>
To: seaint(--nospam--at)seaint.org
Subject: Pedestrian bridge vibration and strengthening

Dear all,
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

Chanon M.
_________________________________________________________________________
Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com.


* 
*   This email was sent to you via Structural Engineers 
*   Association of Southern California (SEAOSC) server. To 
*   subscribe (no fee) or UnSubscribe, please go to:
*
*   http://www.seaint.org/sealist1.asp
*
*   Questions to seaint-ad(--nospam--at)seaint.org. Remember, any email you 
*   send to the list is public domain and may be re-posted 
*   without your permission. Make sure you visit our web 
*   site at: http://www.seaint.org