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RE: Fw: pedestrian bridge

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And a certain prestressed concrete pedestrian bridge at an unnamed local
pro sports venue designed by the firm of a world renowned professor that
had to be retrofitted for the same reason.

Bill Cain, SE
Oakland, CA


	-----Original Message-----
	From:	Rhkratzse(--nospam--at)aol.com [SMTP:Rhkratzse(--nospam--at)aol.com]
	Sent:	Thursday, February 25, 1999 21:40 PM
	To:	prosteel(--nospam--at)domi.com.tr; seaint(--nospam--at)seaint.org
	Subject:	Re: Fw: pedestrian bridge

	In a message dated 2/25/99 1:16:47 AM, prosteel(--nospam--at)domi.com.tr
writes:
	>what live load should be used for a pedestrian bridge spanning
	>up to 210 ft. in some cases, light vehicles may pass
	>
	I don't know the answer to this question, but I would like to
caution the
	designer to consider deflection, vibration, and oscillations
along with
	strength.  I am reminded of a steel footbridge (long ago in a
state far away)
	that arched across a whole freeway in a very elegant fashion
that was closed,
	shored, and restructured (stiffened with trusswork) soon after
opening because
	mere walking on it set up unsafe and scary vibrations.  

	Ralph Hueston Kratz, S.E.
	Richmond CA