Transferring large lateral forces at base of braced frame
Transferring large lateral forces at base of braced frame
(OP)
What mechanism do you generally rely on to transfer large lateral forces at the base a braced frame to the foundation?
Anchor bolts in shear? Shear lug? Bearing directly from column into slab concrete? Some other mechanism?
Anchor bolts in shear? Shear lug? Bearing directly from column into slab concrete? Some other mechanism?






RE: Transferring large lateral forces at base of braced frame
Neffers
RE: Transferring large lateral forces at base of braced frame
Using anchor bolts for significant shear is normally not advised.
RE: Transferring large lateral forces at base of braced frame
RE: Transferring large lateral forces at base of braced frame
I've used this on a lot of jobs and it seems to work well. It's just like any other embed plate that the concrete guys cast into the structure. We've never had any complaints................... yet.
RE: Transferring large lateral forces at base of braced frame
They then extrude out the top, whilst the 'flat' of the u-bar is cast in.
RE: Transferring large lateral forces at base of braced frame
RE: Transferring large lateral forces at base of braced frame
RE: Transferring large lateral forces at base of braced frame
RE: Transferring large lateral forces at base of braced frame
Also, make sure you use low-hydrogen electrodes and A706 rebar. You'll get more reasonably sized fillet welds with E90 electrodes, too.
RE: Transferring large lateral forces at base of braced frame
Do you hook the bottom end of the rebars or just provide full development length?
Also, you weld the gusset plate directly to the embed plate? There is no column base plate? What about uplift?
RE: Transferring large lateral forces at base of braced frame
The column comes out with a baseplate like usual. There are anchor rods for the column for uplift. The embed is offset slightly from the column (just a detailing exercise based on column and baseplate size.
I hook the bars if I need to. For example, if I am trying to develop #8's in a 4' deep grade beam. Usually I don't have to hook them, though. I try not to and only hook them if necessary.
We show the gusset welded directly to the embed, sometime the fabricator wants to hold it up just a little. In that case, we field weld plates on either side of the gusset and to the embed. Shear only at the embed, shear and moment at the gusset - for designing those additional welds.