New Steel Beam to Existing Concrete Column connection Design
New Steel Beam to Existing Concrete Column connection Design
(OP)
Please refer to the attachment. It shows a new steel beam being connected to an existing concrete column; however the connection does not rely on post-installed anchors into the concrete column, but rather a steel plate on either side of the concrete column and clamped to the concrete column via high strength bolts holding the steel beam in place.
I am requesting assistance in how to design such a connection. It will have a downward (gravity dead and live load) downward. I have seen similar connection post applied to precast concrete structures for jib crane and bridge crane supports, but have never designed one myself, or even know if it has a common name with which to search for a design / analysis methodology.
Thank you!!
I am requesting assistance in how to design such a connection. It will have a downward (gravity dead and live load) downward. I have seen similar connection post applied to precast concrete structures for jib crane and bridge crane supports, but have never designed one myself, or even know if it has a common name with which to search for a design / analysis methodology.
Thank you!!






RE: New Steel Beam to Existing Concrete Column connection Design
Mike McCann
MMC Engineering
RE: New Steel Beam to Existing Concrete Column connection Design
RE: New Steel Beam to Existing Concrete Column connection Design
http://www.FerrellEngineering.com
RE: New Steel Beam to Existing Concrete Column connection Design
RE: New Steel Beam to Existing Concrete Column connection Design
RE: New Steel Beam to Existing Concrete Column connection Design
RE: New Steel Beam to Existing Concrete Column connection Design
You can also use Hilti HIT 150 and dowel into concrete on one side only.
Your detail is not worth the risk. You are relying on someone in the field to determine how much clamping to do on those plates. There is no built in FS against human errors or slippage.
RE: New Steel Beam to Existing Concrete Column connection Design
What, specifically in a code would preclude this connection? (Might be something, but I can't think of it.)
RE: New Steel Beam to Existing Concrete Column connection Design
AISC/RCSC all fillers for structural bolts must be steel. The slip-coefficient of faying surfaces must be the same.
http://www.FerrellEngineering.com
RE: New Steel Beam to Existing Concrete Column connection Design
I'm trying to figure out why this is different from shear friction. For example, in Design Guide 1, shear friction is given as one method for resisting column base shear. Any ideas?
RE: New Steel Beam to Existing Concrete Column connection Design
http://www.FerrellEngineering.com
RE: New Steel Beam to Existing Concrete Column connection Design
RE: New Steel Beam to Existing Concrete Column connection Design
Mike McCann
MMC Engineering
RE: New Steel Beam to Existing Concrete Column connection Design
• I too thought perhaps an analogous design comparison could be a shear friction design for column bases.
• Seismic loading is minimal. Wind loading would control, but minimal at this location as well (compared to dead and gravity, which would be consistent for this application). Vibration concerns minimal, but possible.
• Concern about creep in the high strength bolts resulting in lessening clamping tension is a huge concern. If designed for more than a temporary time frame, I had considered tensioning the bolts to impart bearing pressure between the plates to the concrete surface to then calculate the normal friction force to overcome this bearing force ..... and have this resultant friction force be many many times higher than the calculated loading.
• I have most often noted "permanent" connections similar to this where jib cranes have been connected to precast columns (industrial plant settings). In these applications, the jib crane has a relatively light lifting capacity (couple of tons), but here again, as had been mentioned above, dynamic and impact loading would be a concern.
Thanks again, and welcome any more thoughts.
RE: New Steel Beam to Existing Concrete Column connection Design