ASD/LRFD Manual - American Wood Council

78 M10: MECHANICAL CONNECTIONS
31A. Similar to detail 11, but with floor slab poured over
the top of the connection. THIS WILL CAUSE DECAY
AND IS NOT A RECOMMENDED DETAIL!
32B. As an alternative to detail 32A, smaller plates will
transmit forces, but they do not restrain the wood from its
natural movements.
31B. Alternate to detail 31A.
Notched beam bearing. Depth limitations sometimes
cause detailing difficulties at the beam supports. A simple
solution is to notch the beam at the bearing. This induces
large tension perpendicular to grain stresses and leads to
splitting of the beam at the root of the notch.
33A. Notching a beam at its bearing may cause splits.
THIS DETAIL IS NOT RECOMMENDED!
Full-depth side plates. It is sometimes easier to fabricate
connections for deep beams from large steel plates
rather than having to keep track of more pieces. Lack of
attention to wood’s dimensional changes as it “breathes”
may lead to splits.
32A. Full-depth side plates may appear to be a good connection
option. Unfortunately, the side plates will remain
fastened while the wood shrinks over the first heating
season. Since it is restrained by the side plates, the beam
may split. THIS DETAIL IS NOT RECOMMENDED!
33B. Alternate to detail 33A.
American Wood Council