Steel Beam to Concrete Wall Connection
Steel Beam to Concrete Wall Connection
(OP)
I have searched but no real answer. We traditionally use 3/4" embedded plates with 1"x7" studs embedded into the 8" concrete to attach steel beams to the concrete walls. The problem is the connection from the steel beam to the plate. The concrete walls were moved in by 2 inches so we want to weld the two 4x4x3/8 angles to the beam web and fully weld it to the plate. I have heard some concerns about moment transfer and pull out of the embedded plate studs. I have seen this fully welded connection on several projects. Can someone advise if there is a reference and is this a major concern. The beam is a W30x90 and it will extend no more than 1/4" from the face of concrete wall and the top flange will not be welded.






RE: Steel Beam to Concrete Wall Connection
If you weld the angles all the way around to the embed plate, it will attract some moment and will be a problem for the anchors.
RE: Steel Beam to Concrete Wall Connection
Other than above, what SEIT states is typical. Having only a small return will allow the angles to "flex" allowing some rotation.
RE: Steel Beam to Concrete Wall Connection
RE: Steel Beam to Concrete Wall Connection
thanks SEIT..how about I spec. that they only weld the vertical leg of the angle to the beam web. There is sufficient capacity in the vertical welds to hold.
RE: Steel Beam to Concrete Wall Connection
I just don't understand why you are apparently welding the bottom flange.
Mike McCann
MMC Engineering
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RE: Steel Beam to Concrete Wall Connection
RE: Steel Beam to Concrete Wall Connection
If you can decrease the thickness of the angles, flexibility will improve substantially.
BA
RE: Steel Beam to Concrete Wall Connection
RE: Steel Beam to Concrete Wall Connection
RE: Steel Beam to Concrete Wall Connection
RE: Steel Beam to Concrete Wall Connection
RE: Steel Beam to Concrete Wall Connection
http://www.FerrellEngineering.com
RE: Steel Beam to Concrete Wall Connection
BA
RE: Steel Beam to Concrete Wall Connection
http://www.FerrellEngineering.com
RE: Steel Beam to Concrete Wall Connection
BA
RE: Steel Beam to Concrete Wall Connection
http://www.FerrellEngineering.com
RE: Steel Beam to Concrete Wall Connection
BA
RE: Steel Beam to Concrete Wall Connection
http://www.FerrellEngineering.com
RE: Steel Beam to Concrete Wall Connection
I just noticed that I said "not" prohibited in the earlier post. I was thinking not allowed and typing prohibited.
http://www.FerrellEngineering.com
RE: Steel Beam to Concrete Wall Connection
RE: Steel Beam to Concrete Wall Connection
http://www.FerrellEngineering.com
RE: Steel Beam to Concrete Wall Connection
RE: Steel Beam to Concrete Wall Connection
Okay, I was wondering about that. The part I still don't get is why AISC wants a return of two times weld size on the top. Zero return would be my preference. Is there something wrong with that?
hokie,
I have no particular objection to a single plate shear connection welded to the embedded plate and bolted to the beam web, provided the wall can sustain the moment of R*e where R is the reaction and e is the eccentricity.
BA
RE: Steel Beam to Concrete Wall Connection
Yes, the wall has to take that moment locally, but usually the studs (or drilled in anchors) are controlling. Our code actually classifies this type connection as flexible.
RE: Steel Beam to Concrete Wall Connection
I remember one of my professors from school talking about the return helping to keep the stress concentration away from the weld that we're actually relying on for strength. I can't say I've actually looked into that, but I do remember that from class.
RE: Steel Beam to Concrete Wall Connection
The Canadian code also calls for this same return. See CSA S16-01 page 3-65 "Welded Double Angle Beam Connections".
RE: Steel Beam to Concrete Wall Connection
RE: Steel Beam to Concrete Wall Connection
RE: Steel Beam to Concrete Wall Connection
RE: Steel Beam to Concrete Wall Connection
RE: Steel Beam to Concrete Wall Connection
http://www.FerrellEngineering.com
RE: Steel Beam to Concrete Wall Connection
Since you the shear plates or angles will need to be field welded to the plate, field welding to the beam web is not that big a deal.
My preference is angles with a return weld to the embedded and welds with a nearly full return to the beam web.
RE: Steel Beam to Concrete Wall Connection