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Re: need help

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Daniel:

If you are requesting information on how to make a column base fixed,
you should consider 3 components:

Footing rotation
Anchor Bolt elongation
Base Plate flexibility

You should be able to develop a equation to describe each component.

For different combinations of each component, you should then be able to
calculate what percentage of fixity you have achieved.

>From a practical standpoint, the way to approach column fixity is

    1) to use a foundation wall or grade beam to increase rotational
resistance by tieing footings together. A large rectangular footing may
also be a good option, if there are no other footings nearby to tie to.
    2) to use large anchor bolts at large moment arms and
    3) to use a thick base plate or one that is stiffened with gusset
plates

I hope this helps.

Jim Kestner, P.E.
Green Bay, Wi.