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Re: Pitched Tapered Glu-Lam[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaoc(--nospam--at)seaoc.org
- Subject: Re: Pitched Tapered Glu-Lam
- From: Bdpooley(--nospam--at)aol.com
- Date: Fri, 6 Feb 1998 18:58:29 EST
Indeed the 15 psi is a low value for radial tension (tension perpendicular to grain) for Western Species (includes Douglas Fir -Larch, Hemfir, etc.) glulam. However, I disagree with the statement that it is a catastrophic failure. Double pitched and tapered (DPT) glulam beams will sag, but I have yet to hear of a beam that has fallen to the floor/ground. I investigated one situation where the DPT beams sagged two feet under a snow load of 60 or more psf that were designed for 30 psf. One of the beams even fractured to the extent that the bottom tension lamination was broken, but it did not fall. If you know of a failure, I would appreciate hearing from you. AITC now has a recommendation for designing DPT glulam beams for Western species. It shows how to design reinforcement (steel rod or rebar in epoxy) to prevent the "smile" that can occur due to the radial tension. Southern Pine has a much better value for radial tension and many of those designs do not require reinforcement. Contact AITC at 303-792-9559 for more information. Bruce Pooley, P. E.
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