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Re: Rigid vs Flexible Diaphragms - Some Comm

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So long as there is nailing to a common member/chord the sheathing panels do
not have to be in contact (?)

Thor Tandy  P.Eng  MCSCE
Victoria BC

-----Original Message-----
From: Roger Turk <73527.1356(--nospam--at)>
To: seaint(--nospam--at) <seaint(--nospam--at)>
Date: Friday, May 07, 1999 10:04 AM
Subject: Rigid vs Flexible Diaphragms - Some Comm

>These comments are based only on a visualization approach.
>It seems to me that the definition of what constitutes a rigid and flexible
>diaphragm is reversed.  It seems to me that a flexible diaphragm would be
>whose "... maximum lateral deflection is *less* than ?? times the average
>story drift ... ."  (Actually, why is it even related to story drift?)
>This is because the diaphragm does not even start to behave as a rigid
>element *until* the sheathing panels come in contact with each other.
>the panels are/should be installed with 1/8 inch spacing between them, a
>of movement can occur before the diaphragm starts to act as a rigid
>A. Roger Turk, P.E.(Structural)
>Tucson, Arizona