Bending in anchor rods.
Bending in anchor rods.
(OP)
I have a situation where I have a column base that (among other loads) has a tension and shear case. To transfer the shear to the top of my pedestal I was using bending in the anchor bolts (i.e. assuming the grout has cracked and no friction [due to tension]). The thing about it is: my anchor bolt has a larger diameter than the grout thickness, so I'm wondering if this may be overkill. (But it's what I have always done.) [After I figure the bending, I check the combined tension and bending in the bolts (together with the shear).]
I found an older thread on this but that was with the base plates sitting on leveling nuts.
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The link [in that thread] to an AISC discussion on this subject doesn't work.
Thoughts?
I found an older thread on this but that was with the base plates sitting on leveling nuts.
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The link [in that thread] to an AISC discussion on this subject doesn't work.
Thoughts?






RE: Bending in anchor rods.
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RE: Bending in anchor rods.
RE: Bending in anchor rods.
RE: Bending in anchor rods.
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RE: Bending in anchor rods.
For higher shears there are several alternate methods including lugs (which I do not like for constructability issues), embedding the column base, or using angles welded to the side of the baseplate and post-install anchored to the concrete to take the shear.
RE: Bending in anchor rods.
I have had some problems in the past with "cross" or "T" shaped lugs....forming the grout pocket isn't fun and is screwed up half the time.
I have seen and used some details with a piece of HSS welded to the bottom of the baseplate. The block-out in the form work is easier to make and with a properly placed grout hole in the baseplate they usually go pretty well.
RE: Bending in anchor rods.
Been a while since I had to design a lug.
RE: Bending in anchor rods.
If column base has more than 5-10 kips, a shear lug is specified (typical for braced frames).
Contractors may complain that it is 'hard' to do, or they don't know how to do it, but it is done everyday (more common in some regions than others). They can either hang forms or cast in some foam block that can be chipped out later.
Download AISC Design Guide 1 from AISC website which has step-by-step calc instructions and guidelines.
RE: Bending in anchor rods.
RE: Bending in anchor rods.