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RE: UCBC97

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Yi-
Why, in Zone 4, would you NOT want to tie the structure together at the
floor and roof levels? Just do it. Santa Rosa has experienced some
significant ground motions within the last couple of decades resulting in
damage. 

The key to any Unreinforced Masonry Design is to provide ties to limit the
span of unreinforced elements.
Regards,
Bill Cain, S.E.
Oakland CA

-----Original Message-----
From: YI [mailto:YI(--nospam--at)summit-sr.com]
Sent: Monday, October 22, 2001 6:21 PM
To: SEAINT (E-mail)
Subject: UCBC97


Is there anyone who is familiar with UCBC97?  I have a unreinforced stone
masonry building, 2 stories in zone 4.  Section A114.2, part 1, of the code
says that if the wall meets the height to thickness ratio in table A-1-B,
then it doesn't need any bond beams at the roof and second floor level.  But
I'm a little confused by the next paragraph, which seems to me saying bond
beams shall be provided at the roof and second-floor levels, without any
limiting condition.  Also in section A110.2, the exception states that if
the wall meets the height-to-thickness ratio, it doesn't need any
out-of-plane bracing, i.e. bond beam etc.  Any clarification on this is
appreciated. 

Yi Yang
Santa Rosa, CA

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