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Fwd: Re: plywood shear transfer detail[Subject Prev][Subject Next][Thread Prev][Thread Next]
- 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 13:54:19 GMT
In a message dated 97-04-04 15:56:21 EST, ballense(--nospam--at)concentric.net wrote: <<There are several sections to this Code where it is not appropriate even for the simplest of structures. For example, the face nailing of the roof rafter to the ceiling joist will not transfer the tension forces induced by truss action of roof framing. Top plate splices are another example. I believe either this section should be removed from the Cod or the disclaimers should me made more obvious so that it doesn't mislead Contractors or Architects.>> When I checked my first wood-framed house thirty plus years ago, I tried to analyze the roof framing. Strongbacks, collar ties, kickers, hip, ridge and valley rafters that had no apparent supports, etc. tied me up in knots. Finally, one of the experienced engineers took me aside and said it didn't matter what is shown on the plans, the carpenters will frame and/or modify the roof using their rules of thumb and gut feel on what seems adequate based on experience. And the inspectors, who in the old days typically had carpentry backgrounds as well, would eyeball the work in the same manner. And you know what? In areas where heavy snowloads and high winds aren't serious factors, the vast majority of these non-engineered roofs will perform satisfactorily for the life of the building. And the other rules of thumb that formed the basis for the original 'conventional framing' provisions in the code similarly have stood the test of time. My wife is a toxicologist who at times is in controversies over the toxicity and health risks of chemicals in the environment, often in very dilute or trace amounts. The public hearings often become surreal as industry folks, environmentalists and nimbys battle it out. One of her responses to the more outrageous claims is also transferable to structural engineering deficiencies and risks: "Where are the bodies?" The vast majority of folks in this country, and an even greater percentage in the rest of the world, live, work and recreate in non-engineered structures, and all without being aware that some aspects of a building won't "calc out". And they'd shrug their shoulders and view us engineers as chicken littles if we tried to convince them there are theoretical problems. Calls for brick *hithouses to be engineered just give the public impressions that engineers are a self-serving lot. To paraphrase my fire marshal friends ("we have zero-tolerance for unsprinklered buildings"), Bill Allen's position amounts to a zero-tolerance for unengineered buildings, something that the public will have zero tolerance for. Franklin Lew, SE --- Internet Message Header Follows --- Received: from server1.seaoc.org (bqe.com [18.104.22.168]) by host1.texramp.net (8.8.5/8.8.5) with SMTP id RAA00754 for <rlewis(--nospam--at)techteam.org>; Fri, 4 Apr 1997 17:45:35 -0600 (CST) Received: from emout05.mx.aol.com by server1.seaoc.org (NTList 3.02.10) id ya016508; Fri, 4 Apr 1997 14:26:22 -0800 Received: (from root@localhost) by emout05.mail.aol.com (8.7.6/8.7.3/AOL-2.0.0) id RAA10447 for seaoc(--nospam--at)seaoc.org; Fri, 4 Apr 1997 17:24:06 -0500 (EST) Date: Fri, 4 Apr 1997 17:24:06 -0500 (EST) From: IteUrsi(--nospam--at)aol.com Message-ID: <970404172400_-1838376306(--nospam--at)emout05.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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