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Anchor Bolts

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I am design the anchor bolts for a pre-engineered metal building.  I have
noticed in previous discussions that it appears the preference for anchor
bolts is the use of a headed bolt verses a hooked bolt or a bolt with
embedded plate.  I do not have a good resource on anchor bolt design and I
would like some comments on the following:

     What thickness of bolt head should be used?  Is there a minimum
projection width and height of the head or does an ordinary off the shelf
A307 bolt work?

     Is there a minimum length of embedment in concrete you would suggest,
regardless of what the calculations say?

     Is there a practical maximum length of embedment/bolt length for A307
which one could easily buy?

     I have designed buildings for almost 15 years now, including quite a few
pre-engineered buildings.  I have always required the building supplier to
design the anchor bolts and never had much of a problem with that
requirement.  This particular building supplier is making a big fuss about 
having to design the anchor bolts, which includes embedment, etc.  Have I
been wrong to require the supplier to completely design the anchor bolts in
the past?  Prior to getting the calcs, I do not have firm numbers on
reactions to design the bolts myself.  Now, if I design the bolts and the
contractor doesn't like it, does he have a legitimate claim for an extra?

I look forward to your input on this.


Richard Lewis, P.E.
Missionary TECH Team

The service mission like-minded Christian organizations
may turn to for technical assistance and know-how.