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RE: Collectors & Drag Struts

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The parallel beams at either end of the frame are collectors. Not the top
beam. The beams connecting to the ends of the plywood shearwall are
collectors. Not the top plate.

> -----Original Message-----
> From: Michael Bryson [mailto:bryson(--nospam--at)civil.ubc.ca]
> Sent: Monday, July 31, 2000 9:28 AM
> To: seaint(--nospam--at)seaint.org
> Subject: Re: Collectors & Drag Struts
>
>
>
> Thanks for your reply. So you would NOT consider the top
> plate of a shear
> wall to be a collector? Nor the top beam in a frame? It seems
> to me there
> is no physical difference. I am trying to apply the Omega
> factor as per
> UBC97 1633.2.6 and the definitions are not clear to me. Also,
> should the
> connection of the diaphragm to the collectors be designed for
> the Omega
> factor?
>
> On Mon, 31 Jul 2000, Nels Roselund wrote:
>
> > Michael,
> >
> > I don't believe I've seen 'drag strut' used in a formal
> discussion or in a
> > Building Code.  'Collector' is the more formal term.  Like
> Mark, I use the
> > terms 'collector' and 'drag strut' interchangeably.
> >
> >
> > They are used to collect shear forces that are distributed
> to a diaphragm
> > edge into tension or compression forces that they deliver
> to shear walls or
> > other bracing elements.  An edge of a rectangular diaphragm that is
> > uniformly braced along its edge does not need a drag strut;
> if the bracing
> > elements are concentrated at discrete locations, such at a
> shear wall at one
> > end, or at a short length in the middle of a long edge, a
> drag strut is
> > needed.
> >
> > Nels Roselund
> > Structural Engineer
> >
> >
> >
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