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Re: Progressive Collapse Design

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     A collapse has to begin somewhere and that is usually due to
non-continuity (no bracing) in a frame like where there is an opening or a
wall abruptly ends.  A detail that I always watch for is adequate lateral
stability and connection of load bearing lintels.  Hallways are know to have
many openings and are regarded as prime load bearing walls to unify
     The other factor to consider (imho) is the direction of lateral loading
in a seisimic event and the distribution of adequate shearwalls that are
continuouse relative to the oblique plane of loading plus the bracing or
diaphram action (i.e. counter joint force/artificial joint restraint)
required to maintain acceptable displacements of the sub-frame that these
walls make up.
     The displacement from shear (turning square/rectangle into diamond)
will rip nails out of diaphrams (my opinion) and resulting in no continuity
and then no collapse from oblique lateral loading.

-----Original Message-----
From: James Lane, P.E. <jamesalane(--nospam--at)>
To: seaint(--nospam--at) <seaint(--nospam--at)>
Date: Monday, August 09, 1999 1:13 PM
Subject: Progressive Collapse Design

>I have an upcoming project requiring design for progressive collapse. What
>are the sources for such design, manuals, FM's, books, etc? Has anyone used
>RAM Xlinea for such design?
>I believe if you have not been required to design with this in mind you
>in the near future.
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