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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 13:54:48 GMT
This response may apply to two threads. Based on the "Conventional Framing Provisions" of the UBC, the top plates are nailed with 16d @ 16". Of course, this is only good for about 140 PLF. I believe that the nailing of the top plates together should be part of the shear wall schedule as would be the sole plate nailing, etc. Now for the "Convention Framing Provisions" issue. While this seciton of the Code is handy for a junior engineer to get a feel for what the "minimums" might be, this section of the Code is perceived by many (Contractors and Architects) as "Standard" framing. As soon as we specify anything greater than this, we are subject to the criticism of over-engineering. 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 Code or the disclaimers should me made more obvious so that it doesn't mislead Contractors or Architects. I compare this section of the Code to the standard details provided by many building departments for the "famous" 6'-0" block fences which don't calc. either. Regards, Bill Allen ---------- > From: Alexander Itsekson <engineers(--nospam--at)huntingtondesign.com> > To: seaoc(--nospam--at)seaoc.org > Subject: Re: plywood shear transfer detail > Date: Friday, April 04, 1997 1:53 AM > > At 10:38 PM 4/3/97 -0500, you wrote: > > I am refering to residential wood frame construction, with plywood > >shear panels. > > Typically, on the plans, i see a top plate shear transfer detail that > >shows a plywood panel edge nailed to the upper plate ( wood 2 x 4 ) of the > >double top plate then a simpson a35 to a block above. > > While performing structural observation today i see a problem that must > >be common: The plywood panel is 8'tall-1/8". The wood wall is 8'-1" ( > >92-1/4" studs ). With a minimum !/2" ( even 3/8 " ) the top edge nails are > >either in the crack between the two top plates or in the bottom top plate > >that may ( probably ) not have appropriate shear transfer to the upper top > >plate and the a-35 above. > > If the nails are angled, they must be over/under penetrating the plies > >by the nailhead. > > > > Since this is such a common condition , i would appreciate any thoughts > >on this detail. > > This may be hard to understand in this text but next time you observe > >the top plate edge nailing of an 8' shear panel you may see what i mean. > > > > Tom Harris, SE > > Thousand Oaks, CA > > > Tom, > > I have seen this condition too. The way one can deal with it is by nailing > the plywood to the bottom plate and nailing both plates together with 16d > at edge nailing spacing staggered. It may not be the cheapest solutution > but may be the easiest. > > Regards, > > > Sasha Itsekson > Huntington Design Associates, Inc. > Oakland, CA --- 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 MAA27411 for <rlewis(--nospam--at)techteam.org>; Fri, 4 Apr 1997 12:46:53 -0600 (CST) Received: from darius.concentric.net by server1.seaoc.org (NTList 3.02.10) id oa016472; Fri, 4 Apr 1997 10:31:58 -0800 Received: from cliff.cris.com (cliff.cris.com [184.108.40.206]) by darius.concentric.net (8.8.5/(97/04/01 3.26)) id NAA06721; Fri, 4 Apr 1997 13:29:47 -0500 (EST) [1-800-745-2747 The Concentric Network] Errors-To: <ballense(--nospam--at)concentric.net> Received: from ALLENDESIGNS (61065d0011la.concentric.net [220.127.116.11]) by cliff.cris.com (8.8.5) id NAA21870; Fri, 4 Apr 1997 13:29:45 -0500 (EST) Message-Id: <199704041829.NAA21870(--nospam--at)cliff.cris.com> From: "Bill Allen, S.E." <ballense(--nospam--at)concentric.net> To: <seaoc(--nospam--at)seaoc.org> Subject: Re: plywood shear transfer detail Date: Fri, 4 Apr 1997 10:29:21 -0800 X-MSMail-Priority: Normal X-Priority: 3 X-Mailer: Microsoft Internet Mail 4.70.1155 MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit 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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