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Re: Anchor Bolts Revisited

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I was taught NOT to use "j" anchor bolts.  The reasoning that I was taught
was the concrete in the just above the hook could start to crush as a
tensile load is applied.  As this happens, the hooked portion will start
to straighten out.  The end result is that the "j" anchor bolts (er,
excuse me...that would be "rod" now a days) would pull out of the hole as
someone else stated.

Scott Maxwell, PE, SE


On Fri, 25 Aug 2000, PEC - Lake City wrote:

> 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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