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RE: Rigid Diaphragm for a L Shaped Building

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Title: RE: Rigid Diaphragm for a L Shaped Building

Depending on how the roof members are detailed the precaster may have assumed either a flexible or rigid diaphragm.  I would suggest that you first contact the manufacturer's engineer to determine what he assumed before you proceed.

D. Matthew Stuart, P.E., S.E., P.Eng.
Senior Project Manager
Schoor DePalma Engineers and Consultants
Structural Department
200 State Highway Nine
Manalapan, NJ 07726
732-577-9000 (Ext. 1275)
908-309-8657 (Cell)
732 -431-9428 (Fax)

-----Original Message-----
From: Kipp.A.Martin(--nospam--at) [mailto:Kipp.A.Martin(--nospam--at)]
Sent: Monday, October 13, 2003 11:07 AM
To: seaint(--nospam--at)
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

--Kipp Martin
  MWH Americas
  Portland, Oregon

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