Timber Design
Timber Design
(OP)
I have a situation with a timber lintel, simply supported (framed into and resting on masonry walls). The lintel 10" x 6". I have been asked if i can cut 4" off the bottom of the lintel. The lintel is supporting a giant window and has been installed for many years and no one knows what type of wood it is. I feel ok with calculating the stress, the only thing i don't know is what would be a good value to assume for the allowable stress of the lintel?






RE: Timber Design
RE: Timber Design
RE: Timber Design
RE: Timber Design
If you can see all 4 sides of the timber, a forester could tell you what grade the timber is. On a job some time back I had an old timber truss with only only had 3 sides visible, and a forester told me it was at least a #1, but since he couldn't see the other side that was as high as he could go. He could also tell you what species it is too if you don't know that.
I don't know exactly how they grade timbers, but I know it has something to do with the size of knots and how many, and I would imagine thier location in the section. If the cut you are proposing is going to put a knot on the edge, that will certanily reduce the allowable bending stress.
RE: Timber Design
Dik
RE: Timber Design
RE: Timber Design
RE: Timber Design
RE: Timber Design
RE: Timber Design
Dik
RE: Timber Design
RE: Timber Design