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RE: Sawn Beam Repair?[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: "'seaoc(--nospam--at)seaoc.org'" <seaoc(--nospam--at)seaoc.org>
- Subject: RE: Sawn Beam Repair?
- From: "Dennis S. Wish PE" <wish(--nospam--at)cyberg8t.com>
- Date: Wed, 1 Oct 1997 10:26:50 -0700
-----Original Message----- From: Bill Allen [SMTP:BAllenSE] Sent: Wednesday, October 01, 1997 8:13 AM To: 'seaoc(--nospam--at)seaoc.org' Subject: Sawn Beam Repair? I am working on a project that is currently in construction. This is a single family residence. I have specified a 4x12 #2DF beam supporting some ceiling framing at the second floor. According to the contractor, the beam had a slight crown (upward camber) when installed. Near the midspan of the beam, there exists a knot near the bottom edge of the beam near the midspan. A crack has developed at the knot and the beam is sagging. Short of replacing the beam, is anyone aware of a practical technique to repair this beam? Thanks, Bill Allen Bill, being a 4x12, the loads can not be that bad. 1.You might try plating (strapping) the lower half of the beam designed for the tension capacity of the member at maximum bending. Considering the location of the knot, it would not be difficult to determine end distances to center of bolt. If the capacity is small enough for nailing of straps then you don't have much problem. Just use a heavy enough gauge of strap to avoid elongation in the strap. 2. You can also try to "Flitch" plate the beam, but this is more difficult since it requires slicing up through the center of the beam to slip a plate it. This may be desirable if the beam is to be exposed. 3. You can also try to sandwich 2x12's to each side of the beam and 'sister' them together (similar to a micro-lam splice) to support the load in the failing beam. There are a bunch of ways to deal with a beam such as this that does not carry too much load. How did this beam get in originally. I would assume you specified a #1 grade or better. I don't think that a number 1 grade beam is allowed to have a know located mid-span at either edge (tension or compression)? Dennis Wish PE
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