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Re: wood adhesives / GLB cracks[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaint(--nospam--at)seaint.org
- Subject: Re: wood adhesives / GLB cracks
- From: <Bdpooley(--nospam--at)aol.com>
- Date: Fri, 17 Jul 1998 00:43:50 EDT
Tom Harris For pedestrian bridges, the glulam beams are typically specified to be pressure preservatively treated. The "cracks" in the glulam beams are probably seasoning checks, which may have been "enhanced" by the treating process. The fact that the beams look dirty is also an indication that the beams were probably treated. The American Institute of Timber Construction (AITC) has a technical note to evaluate the effect of checks on the capacity of glulam beams. I am not aware of any sections in the building codes that limit seasoning checks. You may wish to contact Mike Caldwell at AITC, 303-792-9559. Having worked for AITC for nearly 10 years and having conducted many field investigations, checking of the beams is typically not a structural problem. What needs to be done is have the beams inspected by a "qualified" engineer or wood technologist to verify that the cracks are indeed seasoning checks or delamination of the glueline. May I suggest that you contact the glulam manufacturer. In many cases, they, or an independent inspector, will inspect the beams to verify compliance with standards and job specifications. If you need further assistance, please contact me. Bruce Pooley, PE Timber Design 3448 South Newland Court Lakewood, CO 80227 phone 303-989-8701 (evenings) or 303-235-2768 (daytime)
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