Slip critical connection at anchor rods
Slip critical connection at anchor rods
(OP)
I have over sized holes in a base plate and the washers will not be welded. Can you use a slip critical connection at the base plate with plate washers?
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Slip critical connection at anchor rods
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RE: Slip critical connection at anchor rods
If you have levelling nuts such that you'd have bolts on either side of the plate assembly, I suppose that's another way to go. I'm not sure what would be required with regard to inspection and prevention of nut travel however.
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: Slip critical connection at anchor rods
Dik
RE: Slip critical connection at anchor rods
RE: Slip critical connection at anchor rods
RE: Slip critical connection at anchor rods
Welding washer is one possibility... sometimes not possible ...and also might be expensive
prestress the bolts is possible..but not a general solution
it is also possible to fill the oversized hole in the base plate with grout ( Hilti Hit for example )
Shear key is the best solution if possible
best regards
Klaus
RE: Slip critical connection at anchor rods
RE: Slip critical connection at anchor rods
RE: Slip critical connection at anchor rods
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: Slip critical connection at anchor rods
Dik
RE: Slip critical connection at anchor rods
In NY and other parts of the states for example I prefer a shear key because welding is very expensive
Welding is an emergency solution
In other parts of the word welding is no problem ( cost wise) at all
The other issue is the number of shear force...many times a shear key is needed because the shear force is too high to be taken by the anchor bolts.
best regards
Klaus
RE: Slip critical connection at anchor rods
Is this column on a braced frame? On braced frames we design our anchor bolts for tension and then we have an embedded plate with shear studs cast into the concrete next to the anchor bolts. The vertical edge of the gusset welds to the column (for the vertical force component) and the horizontal edge of the gusset welds to the embedded plate (to resist the horizontal force on the brace).
If this baseplate is not on a braced frame then you can do something similar. Design your anchor rods for tension and then install post-installed angles around the perimeter of the baseplate using post-installed anchors. Butt the angles against the baseplate, use standard holes in the angles. The angles and post-installed anchors resist the shear.
Lastly, if you have a sizable compression force on the column, then perhaps you can just rely on friction to resist the shear. I don't think it's a good idea to rely solely on friction to resist shear, but if you have huge compression force and a relatively small shear then using friction would seem to be reasonable. You can design the bolts to take the shear but not worry about pre-tensioning them. The baseplate won't slide (if you have enough frictional resistance to resist the shear), but if it does the bolts will be there to act like a stop-block. (If you do this then make sure you have a factor of safety against sliding of at least 1.5)
RE: Slip critical connection at anchor rods
Like this, but grouted after placement ?
http://www.polebase.com/media/images/projects/case...
RE: Slip critical connection at anchor rods
RE: Slip critical connection at anchor rods
RE: Slip critical connection at anchor rods
RE: Slip critical connection at anchor rods