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RE: Two-Stage Analysis

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As I understand it, a flexible superstructure on a much more rigid
sbustructure will not be significantly influenced by the dynamic properties
of the substructure.  Thus, these provisions allow a more refined analysis
than using the the lower R-value for the entire structure.  

-----Original Message-----
From: Jeff Creagan [mailto:jeffc(--nospam--at)]
Sent: Friday, October 01, 1999 2:01 PM
To: seaint(--nospam--at)
Subject: Two-Stage Analysis

Does anyone know the background behind the two-stage design procedure
requirements in UBC 1630.4.2 and 1629.8.3, Item 4?  This provision was first
introduced in the 1988 UBC but I can find no commentary that indicates the
basis for it.