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- Subject: Fwd: Lateral Stability of Wood Beams
- From: rlewis(--nospam--at)techteam.org (Richard Lewis)
- Date: 30 Jul 1997 14:30:46 GMT
Re: Lateral Stability of Wood Beams Ref: 1.) 1991 NDS 2.) "Lateral Stability of Glue Laminated Beams," by R. F. Hooley and B. Madsen, ASCE Structural Journal, June, 1964, p. 201. Is there a problem with the lateral stability requirements for unbraced wood beams in the 1991 NDS? A while back, I was designing a wood beam that had what I considered a rather large unbraced length (it was a beam supporting an exterior bearing wall at a stairwell) and was getting very small reductions in allowable stresses using the provisions of Section 3.3.3, so I decided to check R(B) (Eq. 3.3-5) to see what would an effective length be for R(B) = 50. Assuming a 2 X 12, it would have to be *42'-8"* long before R(B) would be equal to 50! A footnote to Table 3 of reference (2) states that critical stresses were determined by using E (Modulus of Elasticity) and G (Shear Modulus) from Table 2, *however*, Table 2 has the Shear Modulus and the Modulus of Elasticity listed with the *same order of magnitude* instead of the Shear Modulus being about 1/16th of the Modulus of Elasticity. I called this to the attention of AFPA when I discovered it, but never received any response. I would appreciate any comments and thoughts that you might have on this. A. Roger Turk, P.E. A. R. Turk, Consulting Engineer Tucson, Arizona --- 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 KAA02709 for <rlewis(--nospam--at)techteam.org>; Fri, 28 Feb 1997 10:27:26 -0600 (CST) Received: from hil-img-6.compuserve.com by server1.seaoc.org (NTList 3.02.10) id ma004770; Fri, 28 Feb 1997 08:20:27 -0800 Received: by hil-img-6.compuserve.com (8.6.10/5.950515) id LAA28556; Fri, 28 Feb 1997 11:17:55 -0500 Date: 28 Feb 97 11:16:38 EST From: Roger Turk <73527.1356(--nospam--at)CompuServe.COM> To: SEAOC <seaoc(--nospam--at)seaoc.org> Subject: Lateral Stability of Wood Beams Message-ID: <970228161637_73527.1356_CHK72-1(--nospam--at)CompuServe.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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