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RE: Rigid Diaphragm for a L Shaped Building

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Before a diaphragm can act rigid, it has to be designed as such.  I would
look for a check which details how forces are transferred.  You still have
to resolve internal diaphragm forces for diaphragm tension chords, shear
transfer etc.  Draw moment and shear diagrams for the diaphragm using
flexible supports (walls).  Then resolve in your mind how forces get from
loaded elements to supporting elements.  Not just into and out of the
diaphragm.  How does the force transfer -while inside- the diaphragm?

Based on your e-mail; I would agree there needs to be a collector, and
likely a diaphragm tension chord, of some sort.

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

-----Original Message-----
From: Kipp.A.Martin(--nospam--at)us.mwhglobal.com
[mailto:Kipp.A.Martin(--nospam--at)us.mwhglobal.com]
Sent: Monday, October 13, 2003 9:07 AM
To: seaint(--nospam--at)seaint.org
Subject: Rigid Diaphragm for a L Shaped Building


I am currently doing a design review check for a project that has a single
story L shaped building.  The roof diaphragm is made up of precast double
tees.  The designer has a beam across the re-entrant corner to carry the
vertical loads, but has not detailed the beam to act as a drag strut.  Now,
I know that for flexible diaphragms, this beam would act as a drag strut to
provide for compatible diaphragm deflections.  Is this required for a rigid
diaphragm?  My gut feeling is that the beam should be detailed to act as a
drag strut, because the diaphragm will still deflect, just not a much.
None of the books that I have show examples of a rigid diaphragm on an L
shaped building, just nice rectangular floor plans.  Any opinion on this is
appreciated.

--Kipp Martin
  MWH Americas
  Portland, Oregon




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