Bond beam interupted by W-shape bearing on shear wall
Bond beam interupted by W-shape bearing on shear wall
(OP)
Ok, so I'm looking for some details of how to transfer the forces in a bond beam that is disrupted by a W-shape beam at a reentrant corner. I have attached a crude drawing to show my situation. The bond beam that is parallel to the W-shape I'm going to weld rebar to the beam web and tension splice within the bond beam. I'm not sure how to make the connection with the bond beam perpendicular to the beam web though. Thanks






RE: Bond beam interupted by W-shape bearing on shear wall
Before we dive into it in earnest, what are the sources of the forces that you mean to transfer with this connection? I only ask because, frankly, I'm surprised that such a connection would be required. And, of course, the best possible answer would be that no connection is required at all.
I remember this from the other thread! Sweet detail. I still have a couple of concerns however.
1) I worry about the constructability of the welded joint between rebar and beam. It looks as though it would require the rebar to be cast into the bond beam such that it would be perfectly centered on the beam web. I'd recommend something that accommodates some misalignment tolerance.
2) Looking at the connection, it appears that it will create an unintended moment connection between your beam and your wall. There could be a few remedies for that:
a) drop the bond beam down a course.
b) don't make the welds until all dead loads are in place.
c) provide a nice stiff beam to limit end rotation.
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: Bond beam interupted by W-shape bearing on shear wall
RE: Bond beam interupted by W-shape bearing on shear wall
RE: Bond beam interupted by W-shape bearing on shear wall
RE: Bond beam interupted by W-shape bearing on shear wall
Shame on the concrete masonry folks. That ill-conceived bond beam "lap splice" looks to be nearly worthless. Whoever came up with it clearly isn't a concrete designer on the side.
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: Bond beam interupted by W-shape bearing on shear wall
RE: Bond beam interupted by W-shape bearing on shear wall
BA
RE: Bond beam interupted by W-shape bearing on shear wall
Is A307 rebar available anywhere?
Suggest drawing the embed plate and beam to scale (W16x31 has 5 1/2 wide flange, plate looks closer to 4"x6" and only one headed stud is shown).
Suggest adding stiffener plates to the beam at the support.
RE: Bond beam interupted by W-shape bearing on shear wall
Will the load path for drag strut compression need to run through the extended bond beam rebar as well?
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: Bond beam interupted by W-shape bearing on shear wall
No, fortunately this is an addition to the existing fire station and there are high bay walls that block wind loading from introducing compression into the drag strut (W shape). Seismic loading could introduce compression into the member, but this is in a relatively low seismic zone and the geotech report seems to indicate we have pretty decent soils.