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- To: wai(--nospam--at)euken.com
- Subject: Fwd: Re: plywood shear transfer detail
- From: rlewis(--nospam--at)techteam.org (Richard Lewis)
- Date: 06 Aug 1997 14:58:19 GMT
In a message dated 97-04-08 02:52:17 EDT, AnandNene(--nospam--at)aol.com wrote: << I have told my clients many times that old conventional framing will not "calc out to code" but performs.>> One reason this is often the case is that most structural members and connections do not experience the maximum loads and stresses during their service life that the code requires they be designed for. In fact, the maximum conditions often occur during construction. We've all seen roofers stacking bundles of roof tiles and plywood on a few roof rafters. That practice will stress the rafters and connections more than any subsequent loads (other than during a reroof), and surely overstresses further the nailed connections between rafters and ceiling joists tha Bill Allen expressed concerns over. A second reason why buildings perform even though they don't calc out is that our analyses are fairly simplistic (for wood frame residential buildings). In using the ELF analysis for seismic, or simple span assumptions for a hip roof framing, we make it easier for ourselves, and are comfortable in our knowledge that these are conservative approximations. But in reality, a hip roof needs to be analyzed as a three dimensional, indeterminate system. Those strongbacks and kickers perform load redistribution that we ignore in our simplistic analyses. The connection calcs ignore the effect of gravity in providing friction resistence. <<We need to find a good compromise and a balance between reality and rejecting what can not be "calced out". >> This is a good subject for a thread in its own right. Perhaps other readers will share their experiences and approaches in dealing with clients on such situations. Franklin Lew, SE --- Internet Message Header Follows --- Received: from server1.seaoc.org (bqe.com [188.8.131.52]) by host1.texramp.net (8.8.5/8.8.5) with SMTP id NAA04084 for <rlewis(--nospam--at)techteam.org>; Tue, 8 Apr 1997 13:36:34 -0500 (CDT) Received: from emout19.mx.aol.com by server1.seaoc.org (NTList 3.02.10) id la016911; Tue, 8 Apr 1997 10:44:11 -0700 Received: (from root@localhost) by emout19.mail.aol.com (8.7.6/8.7.3/AOL-2.0.0) id NAA18508 for seaoc(--nospam--at)seaoc.org; Tue, 8 Apr 1997 13:41:36 -0400 (EDT) Date: Tue, 8 Apr 1997 13:41:36 -0400 (EDT) From: IteUrsi(--nospam--at)aol.com Message-ID: <970408134134_922536204(--nospam--at)emout19.mail.aol.com> To: seaoc(--nospam--at)seaoc.org Subject: Re: plywood shear transfer detail 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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