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Re: Glulam Beams[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: <seaint(--nospam--at)seaint.org>
- Subject: Re: Glulam Beams
- From: "Bruce D Pooley" <bdpooley(--nospam--at)home.com>
- Date: Wed, 15 Dec 1999 16:05:25 -0700
1. Most lumber yards have both 24F-V4 and 24F-V8 in inventory. This may vary in some locations, but for the most part they should be available. 2. I usually specify camber for longer spans (30 ft and longer) for residential or light commercial unless there are large point loads or other special considerations, such as a garage header or roof slope to prevent ponding. If calculated camber (1.5 times dead load deflection) is less than 1/4 inch, I usually do not specify. The ANSI/AITC A190.1-1992 allows a tolerance of 1/8 inch per 20 ft. So if you specify 1/8 inch camber for a 20 ft long beam, they could supply you a straight beam and be in conformance. 3. I believe most stock 24F-V8 beams are not cambered since they are used for continuous and cantilevered beams that usually have small deflections. I would go with the straight beam if the calculated deflection is small (less than 1/4 inch). 4. Who said that camber is never used? Lumber yard? I generally do not specify or require cambered glulams for this application. Of course, there may be special situations where you have a heavy point load near mid span that could create large deflections. In that situation, I would consider specifying camber. Bruce Pooley Timber Design 3448 South Newland Court Lakewood, CO 80227 phone 303-989-8701 ----- Original Message ----- From: James Allen <allen(--nospam--at)xyz.net> To: 'Sturctural Eng List Server' <seaint(--nospam--at)seaint.org> Sent: Wednesday, December 15, 1999 2:39 PM Subject: Glulam Beams I have a few questions: 1. Has anyone found 24F-V8 DF/DF glulam beams 5.125 wide by 12 and 15 inches deep to be special order items, i.e. long lead items? 2. What is your experience with camber? Do you typically specify camber? 3. I have a project with simple span window headers and one case with the glulam header extending beyond the exterior building line as a cantilever to support a roofed entry. I spec'd a 24F-V8 cambered to be installed upside down so deflections would be minimized and be apparent under deadloads. What is your opinions about this installation. 4. I used the same spec. 24F-V8 and cambered for the simple span headers, 5 feet maximum span, and was informed that camber is never used for this type of installation. Opinions, please. Thank you. James Allen, P.E.
- Glulam Beams
- From: James Allen
- Glulam Beams
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