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Fwd: Building drift and separation[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: wai(--nospam--at)euken.com
- Subject: Fwd: Building drift and separation
- From: rlewis(--nospam--at)techteam.org (Richard Lewis)
- Date: 07 Aug 1997 12:38:18 GMT
Please note that the 1994 UBC says (I'm paraphrasing) to use 3Rw/8 = 0.38Rw, to caclulate the drift of each adjacent structure, but that the 1997 UBC will increase this requirement to 0.7R. Thus, the drift caclulation and building separation requirements will double in the 1997 UBC. The use of R vs Rw will have no effect, since the lateral forces used to caclulate the deflections were originally divided by R or Rw. Also, there are some proponents who believe that the actual expected drifts can be even higher, especially for short period structures (less than about 0.5 sec), and that the 0.7R is really only suitable for structures with longer periods. Countering these arguements is the fact thatthe UBC requires the building separation to be calculated as the sum of the displacements of both adjacent structures, which is an absolute worst case assumption. Probabalistically, the square-root-sum-of-squares is a more likely maximum (which I do not recommend using, for reasons given above). Martin Johnson EQE International, Inc. mwj(--nospam--at)eqe.com --- Internet Message Header Follows --- Received: from server1.seaoc.org (bqe.com [220.127.116.11]) by host1.texramp.net (8.8.5/8.8.5) with SMTP id TAA10112 for <rlewis(--nospam--at)techteam.org>; Fri, 18 Apr 1997 19:58:13 -0500 (CDT) Received: from eqe.com by server1.seaoc.org (NTList 3.02.13) id fa018829; Fri, 18 Apr 1997 17:53:02 -0700 Received: from EQE_IRV_01.EQE.COM by eqe.com via ESMTP (951211.SGI.8.6.12.PATCH1502/951211.SGI) for <seaoc(--nospam--at)seaoc.org> id RAA21046; Fri, 18 Apr 1997 17:50:14 -0700 Received: from EQE_IRV_01/SpoolDir by EQE_IRV_01.EQE.COM (Mercury 1.31); 18 Apr 97 17:54:29 +1100 Received: from SpoolDir by EQE_IRV_01 (Mercury 1.31); 18 Apr 97 17:54:15 +1100 From: "Martin Johnson" <mwj(--nospam--at)EQE.COM> To: seaoc(--nospam--at)seaoc.org Date: Fri, 18 Apr 1997 17:54:13 PST Subject: Building drift and separation Priority: normal X-mailer: Pegasus Mail for Windows (v2.52) Message-ID: <106B5A9198B@EQE_IRV_01.EQE.COM> Reply-To: seaoc(--nospam--at)seaoc.org Error-To: seaoc-ad(--nospam--at)seaoc.org X-Loop: seaoc(--nospam--at)seaoc.org X-Info: [SEAOC] Owner: seaoc-ad(--nospam--at)seaoc.org X-POP3-Rcpt: seaoc-ad(--nospam--at)seaoc.org X-Sender: seaoc-ad(--nospam--at)seaoc.org Precedence: list X-ListMember: rlewis(--nospam--at)techteam.org [seaoc(--nospam--at)seaoc.org] __________________________________________________ Richard Lewis, P.E. Missionary TECH Team rlewis(--nospam--at)techteam.org The service mission like-minded Christian organizations may turn to for technical assistance and know-how.
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