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Re: Taking Questions for Seismology Submission

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In a message dated 8/18/99 9:26:39 AM Pacific Daylight Time, 
Bill(--nospam--at)AllenDesigns.com writes:

<< I, for one, would be interested in an answer to Oshin Tosounian's question
 about h/b vs. deflection calculations of plywood shear walls.
 
 Bill Allen, S.E.
 ALLEN DESIGNS
 Laguna Niguel, CA >>

Michael Valley responded to the questions with:
"Two sections of the UBC may do what you want here.  Section 1629.10.1 
says "Alternative lateral-force procedures using rational analyses 
based on well-established principles of mechanics may be used in lieu 
of those prescribed in these provisions."  Section 1632.5 provides a 
similar allowance.  These sections are provided to allow designs that 
aren't strictly code-compliant when sufficient engineering is 
provided.

The key words in your question are "when supported by analysis."

Is this a valid solution to the problem that allows the engineer to exceed or 
disregard the ratio as long as he can provide sufficient analysis to prove 
that the deflection is within code allowable? This was how prior codes 
handled walls that did not meet the H/b ratio.

Dennis