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RE: through-truss without top chord bracing

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The basic design considers to catch the lateral thrust of the top chord, when this one tries
to buckle laterally, by means of vertical stiffeners. These stiffeners are set out at the panel
points, matching transvers members of the deck and they are usually arranged with varying
depth, ( tapering ) narrowing to the top and with its wider section at the base, in the corner
with the transvers member, getting full continuity with it. In this way, a kind of inverted frame
is formed. The rigid corners of this 'frame', provides the riquired stiffness to retain the lateral
buckling mode of the chords, which are analyzed with spring-lateral supports, at the panel
points. ( Spring-stiffness = frame legs-lateral stiffness ).
-----Mensaje original-----
De: Ken Peoples <kspeoples(--nospam--at)>
Para: Seaint <seaint(--nospam--at)>
Fecha: Lunes, 11 de Febrero de 2002 10:10 a.m.
Asunto: 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)