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RE: through-truss without top chord bracing

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I believe these pony trusses were quite common in Ohio for short highway
bridges. You might also want to check the old Ohio Highway spec. More than
a few of these bridges collapsed as a result of a vehicle hitting one of
the trusses (a lateral load that was not anticipated). The top chord was
typically designed as a column with elastic lateral supports.

Another approach would be to extend some of the floor beams and provide a
diagonal up to the top chord at perhaps the ends and mid-span.

Jim Kestner
Somerville Inc.
2100 Riverside Drive
Green Bay, Wi  54301
(920) 437-8136
Fax (920) 437-1131

-----Original Message-----
From:	Ken Peoples [SMTP:kspeoples(--nospam--at)]
Sent:	Monday, February 11, 2002 10:09 AM
To:	Seaint
Subject:	through-truss without top chord bracing

Can any of you recommend a reference for the design of a through-truss
(pony truss?) without top chord bracing?  I have seen trusses - such as
gangways - where the top chord "appears" to be unbraced.  In actuality,
they must use the stiffness of the vertical web members to resist the
lateral buckling of the top chord because there is no way for the top chord
to be considered as unbraced for the entire span of the truss and still be
able to take much compressive load.  Are any of you familiar with a design
procedure for this type of system?
Thanks in advance,

Kenneth S. Peoples, P. E.
Lehigh Valley Technical Associates
1584 Weaversville Road
Northampton, PA 18067-9039
Phone: (610) 262-6345
Fax: (610) 262-8188
e-mail: kpeoples(--nospam--at)

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