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Re: gap below base plates

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I have no answers, but a few questions:

1. You say there is a 1/16" gap in _some_ places.  Where?
2. What mechanism maintains the gap?
3. Is there any tension in an anchor bolt? (I know; that's hard to measure.)
4. Is the base plate stiffened in any way?
5. Can you see any deformation in the base plate?  (Is it still flat?)
6. Is the column a major member of the structure, carrying substantial load, or
part of a braced frame or moment frame system?
7. You appear to be considering filling the gap with some kind of material.  If
the existing grout has problems, shouldn't that be removed first?

Remember, they're just questions; nothing's meant by them.

-Keith Fix, PE

--- Ken Peoples <kspeoples(--nospam--at)> wrote:
> We have a situation that I haven't seen before.  I don't know the details of
> how or when the grout was installed under the building column base plates (I
> will find that out though), but the grout is not in contact with the bottom
> of base plate in some areas.  The space is small - maybe 1/16" and less, but
> I don't think this is acceptable (please correct me if I am wrong).
> Two possible causes that I can think of are:
> 1. Installing the grout before all of the steel was erected (so the column
> plumbness was changed after the grout was installed)
> 2. Grout is not shrinkage resistant
> I know that the cause needs to be found out before the fix is implemented,
> but I would like to know what fixes are available.
> I was thinking that there would  be a way to seal around the edge of the
> opening and inject an epoxy grout into the gap, but I have never done this or
> seen it done.  Any of you have experience with such a method?  I plan to
> contact a grout mfr. - such as 5 Star grout, but I wanted to check with you
> designers and get your thoughts first.
> As always, thanks in advance,
> Ken
> Kenneth S. Peoples, P. E.
> Lehigh Valley Technical Associates
> 1584 Weaversville Road
> Northampton, PA 18067-9039
> Phone: (610) 262-6345
> Fax: (610) 262-8188
> e-mail: kpeoples(--nospam--at)

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