Flitch beams
Flitch beams
(OP)
Adding steel plates outside an existing deteriorated glulam wood beam. Simple question; does the steel plate have to extend to each support?? If not, how to design the connection at the termination of the plate??
RE: Flitch beams
It doesn't have to but, if it doesn't, some special detailing is required as you clearly have anticipated.
1) In a perfect world, you would force the curvatures of the plate and the glulam to match at all locations along the span. This speaks to moment connections at the ends of the plates to get that done. The same connections would have to dump the shear out of the plates locally as well.
2) Given the inaccuracies involved with this kind of work, I favor a simplified approach where I consider the plates to be end supported and loaded only at the middle or third points etc. Then, with that model in hand, follow through with free body diagrams and shear only connections to suit.
RE: Flitch beams
RE: Flitch beams
RE: Flitch beams
@OP: The method described in Agent666's article is basically the same as my #1. It's also analogous to the MQ/I method of "developing" partial length cover plates in steel work. We discussed that in depth in this thread: Link
RE: Flitch beams
If possible, using a channel that is long to keep the moment force down will be beneficial. the flanges will help brace the plate from buckling when not bolted back.
RE: Flitch beams