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Re: Rigid Diaphragm Analysis

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How to make a plywood diaphram rigid?  A step in the right direction would
be finger jointing the edges of the 4X8 sheets and designing the connections
at the corners of each sheet to transfer the diaphram force without
separating in tension or buckling in compression.  By "finger joint" I mean
^^^^^^^^^^^^^^ for 4 sides or 2 if you WANT a slip plane.

just a thought,

-----Original Message-----
From: Seaintonln(--nospam--at) <Seaintonln(--nospam--at)>
To: seaint(--nospam--at) <seaint(--nospam--at)>
Date: Sunday, May 09, 1999 3:09 AM
Subject: Re: Rigid Diaphragm Analysis

>I couldn't agree with you more. This has always been my position. Who is
>really jumping the gun.
>Once Northridge hit, the cities and committees were on the run to create
>emergency measures that would put the city back together and create
>measures JUST IN CASE the design was at fault. It was done as a mitigation
>measure but was only considered temporary until the damage could be
>I think that the committees started with the premise that we were dealing
>with new variables that were never considered in prior quakes. Therefore we
>needed to upgrade the code because it was believed that the damage was due
>these unknown variables at the time.
>However, when the dust settled, the preliminary reports showed that design
>was not the problem - execution of the design was the culprit.
>I would think that the committee's should have taken a step back and
>considered the information at hand for different types of buildings instead
>to progressing with changes in methodology based upon one type of model.
>model does not fit all buildings and the ones most seriously affected by it
>is the one that probably needs it the least.
>But what do we do now?