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Anchor Bolts Revisited

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On the list, we recently discussed the pros and cons of using anchor bolts
with nuts versus anchor bolts with plate washers, etc.  What about
"j-anchors"?

I am reviewing some shop drawings for some mast arm structures.  These
typically have drilled shaft foundations and historically the fabricators
have used very long anchor bolts (7'-0" long anchor bolts are not uncommon)
with a "J-Hook" at the bottom.

How well do the hooked anchor bolts perform compared to the straight anchor
bolts with nuts for tension loading?

Perhaps one of the fabricators can answer this one:  Are the long anchor
bolts provided for convenience (since the fabricator typically does not
design the foundation and therefore, does not know what kind of reinforcing,
etc. is provided for the load transfer)?

David Finley, P.E.




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