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Re: Rigid vs Flexible Diaphragms - Some Comments

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I do too.

Thor Tandy  P.Eng  MCSCE
Victoria BC

-----Original Message-----
From: Jim Kestner <jkestner(--nospam--at)>
To: seaint(--nospam--at) <seaint(--nospam--at)>
Date: Friday, May 07, 1999 10:27 AM
Subject: Re: Rigid vs Flexible Diaphragms - Some Comments

>My approach to this problem is similar to yours, although the projects
>that I have done in California are few and far between and the more
>recent ones we have used local consultants. I typically calculate the
>wall and diaphragm forces for 3 conditions: flexible (simple span),
>semi-rigid (continuous beam) and rigid (distributing shears based upon
>stiffness of the resisting elements and adding the torsional shear
>component). I bound the problem by using the higher forces from each
>analysis. With this approach, I don't need to agonize over whether the
>diaphragm is flexible or rigid. It takes more time to do this, but the
>answer covers all conditions.
>This approach can be incorporated on large projects, where the fee is
>bigger, but I can see the difficulty of doing this more complicated
>analysis on small house projects where the fee is minimal.
>Jim Kestner, P.E.
>Green Bay, Wi.