ACI 318 App D - anchor effective depth limit? 1

[BurgoEng]

We typically have very high loads and per our company standards, this ends up requiring longer than typical embedment depths for anchor bolts/rods.
I'm using 318-02 for a design right now, and D.5.2.2 gives the equations for breakout strength, but only provides equations for up to 25" embedment, which according to the commentary was the limit in their testing.
Can I assume (always a risk) that the equation is acceptable for embedments greater than this? ie 30" or even more?

 

[Taro]

I asked this same question of Dr. Ronald Cook (author of the provisions) when the CCD method was introduced. His response...

"The limits on length and diameter are simply due to the limits on the test database. There is likely no performance problem associated with using the method for the design of deeper embedments, it's just that you will be on your own code-wise in making this judgment".

 

[AllStructure]

There is a pervision on IBC section 1912 that over-writes the ACI chapter D limitations. End result is, you apply a 0.75 - factor to your factored nominal capacity of the anchor rod.

 

[sdz]

Is that meant to be "perversion" or "revision"?

 

[sdz]

BurgoEng, What bolt size, grade, etc. are you using? Why are you getting such large depths?
Anyway the limit of 635mm (get with metric, this is the Century of the Fruit Bat) applies to equation D-8, not D-7. [or did I miss something]
I use ACI318M-05.

 

[Taro]

I think it was meant to be "provision". But I kind of like "perversion" better. It might be a more accurate representation.