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Earthquake Forces[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: SEAOC List Server <seaint(--nospam--at)seaint.org>
- Subject: Earthquake Forces
- From: John Lawson <jlawson(--nospam--at)kramerinc.com>
- Date: Mon, 18 Jan 1999 22:24:21 -0800
Reply to Kipp Martin: 1997 UBC Section 1630.1 is meant to define "E" as it is listed in the fundamental load combinations in section 1612. Thus all earthquake forces "E" get influenced by rho. BUT....Lateral forces on elements and components (UBC 1632) sets rho=1.0 instead of whatever the building's structural system rho is. Since your masonry wall is an element, yes you use rho, but it is 1.0 in value. Another clarification, diaphragms are no longer listed under the table of "elements of structures" (UBC Table 16-O), but have there own independent section 1633.2.9. Unfortunately, rho is not clearly defined for the design of diaphragms. From my discussions with several of those associated with "officially" interpreting the 1997 UBC, rho is supposed to be 1.0 for diaphragm elements of the structure. Don't quote me but pray it's true. Chasing down the correct interpretation of portions of the 1997 UBC has been tricky for me and a wild ride to say the least. Stay tuned and hold on! John Lawson SE Kramer & Lawson, Inc.
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