i beam into shear wall connection
i beam into shear wall connection
(OP)
I am designing a cantilever beam which will be connected to a shear wall. My supervisor instructed me to use hilti bolts to anchor the i beam into the shear wall. How do i design this connection?
Is there an easier way to anchor the i beam into the shear wall?
Is there an easier way to anchor the i beam into the shear wall?






RE: i beam into shear wall connection
Be sure to take spacing and edge distances into account. Also, given that it is a cantilevered beam on an embed with epoxy anchors (no redundancy - this seems like a critical connection), be sure to check the creep characteristics of the epoxy and also consider using a higher factor of safety than Hilti gives for their allowables (I blieve they us a F.S. of 4).
RE: i beam into shear wall connection
The capacity of these bolts is very dependent on proper installation. Once you get out into the field you realize some contractors are much better than others. We typically design these bolts for a higher factor of safety- Typically twice that stated in the Hilti tables. This isn't cheap, but depending on the application could be a good idea.
RE: i beam into shear wall connection
I don't think it has been implemented yet, but Hilti has been talking about "certifying" people to install these adhesive anchors because, as you stated, the capacities are so dependent upon proper installation.
The certification would be for an individual, not a company, and would follow that person (i.e. if that person left the company they would need to have someone else certified).
I certainly don't think that unqualified people will not be installing the adhesive anchors anymore, but it is a step in the right direction.
RE: i beam into shear wall connection
I frequently use an embedded steel plate with Nelson Stud Anchors welded to the back, with the finn plate for the steel beam being field welded to the emmbedded plate. The beam is then bolted to the finn plate, and the top and bottom flanges welded to the embedded plate. Not quite as simple, but it avoids the vibratory load issue.
Mike McCann
MMC Engineering
RE: i beam into shear wall connection
Most chemical anchors do not stand up very well in elevated temperatures. If this connection needs to be fire rated then you need to find an anchor that still works at elevated temperatures (rare) or use a mechanical anchor.
The same thing applies to welding, all welding should be carried out before the chemical anchors are installed.
It is not clear from your post if the shear wall is existing or proposed, but if it has not been poured yet then an embedded plate would be much more appropriate.
RE: i beam into shear wall connection
We had a guy from Hilti come to our office to give us a presentation on their new adhesive system (a result of the investigation of the Big Dig tunnel liner collapse) and he mentioned the certification. However, I too am not about to start trusting contractors just yet.
RE: i beam into shear wall connection
RE: i beam into shear wall connection
Studentcivil08,
Resolve you moment into a push-pull and design the anchors for the resulting pullout force.
Does your beam frame in-plane of the shear wall or onto the face of the wall. If your framing onto the face of the wall, be sure you follow your moment through the wall.
Also consider what effects temperature and vibration may have on your connection as mentioned above.
RE: i beam into shear wall connection
RE: i beam into shear wall connection
Would prefer to embed weld plates into the wall to later weld to the canti beam. Just be careful about expansion of the plate when welding (provide a gap around the edge of the plates).