built up wood beam
built up wood beam
(OP)
Our design called for a 3-ply 2 x 12 built-up beam. The builder put a joint in the
end span (see attached sketch). This is not allowed by the NBCCanada. He has suggested a 4th ply be laminated in the end span. Essentially it seems he still
has a 3-ply beam as far as bending moment is concerned and should be OK for moment resistance He can't get any end bearing without a lot of work. Are we
entitled to assume that the beam as now constructed will resist the horizontal
shear adequately. The span is 11 ft and the loads are just typical residential loads
end span (see attached sketch). This is not allowed by the NBCCanada. He has suggested a 4th ply be laminated in the end span. Essentially it seems he still
has a 3-ply beam as far as bending moment is concerned and should be OK for moment resistance He can't get any end bearing without a lot of work. Are we
entitled to assume that the beam as now constructed will resist the horizontal
shear adequately. The span is 11 ft and the loads are just typical residential loads






RE: built up wood beam
Regarding shear - as long as you design and detail the connection from the 4th ply to dump its reaction back into the plies that actually bear on the wall, it's not a problem. It's unlikely that shear controlled anyway. I'm not saying it never happens, but I have never run across a wood beam that was controlled by shear (that didn't have a notch in it).
RE: built up wood beam
An additional full length ply needs to be added with support under it at the 6X6 column (add a 2X6 to the 6X6 column for full support).
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
RE: built up wood beam
Is the extra 2x6 post absolutely necessary?
RE: built up wood beam
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
RE: built up wood beam