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Re: Diaphragm Chords

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i think i just came across this problem in my own work.
i didn't realize it before, but you have pointed it out at the right time !
thanks for asking your brain boggle questions.

anyways, my problem is such that for the diaphragm i have, it is
linking a certain portion of the building.  perhaps they just asked
that question, so you could later apply it to a situation that arises.

anyways, i think Mark answered your question too.

On 10/9/06, Mark E. Deardorff <mdeardorff(--nospam--at)> wrote:

The chord, acting as a chord, need not use Em. The chord acting as a drag is
different, however.

Mark E. Deardorff, Structural Engineer
Burkett & Wong
San Diego, CA

 From: Jake Watson [mailto:jake.watson1(--nospam--at)]
Sent: Monday, October 09, 2006 12:28 PM
To: seaint(--nospam--at)
Subject: Diaphragm Chords

Quick poll, does anyone know of a condition when Em (Omega) forces are
required for diaphragm chords?  As I mentioned before, I am studying for the
SE II exam.  A sample problem from NCEES did just that with a plywood
diaphragm and masonry shearwalls.  I can't find a provision that even hints
this is required.  I know about struts / collectors, but have never seen a
chord checked with this combination.

Jake Watson, P.E.
Salt Lake City, UT

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