Concrete breakout tension+shear interaction when tension reinforcement is sufficient?

[rxh241]

I ran into this problem while checking the anchor bolt in column pedestal. The column reaction has 250 kips tension and 70 kips shear simultaneously. The pedestal has designed for sufficient perimeter rebars to transfer AB tension. Shear key is also designed to take 100% max shear load. Concrete strength was checked under pure shear.

Now I was reading ASCE anchor bolt design guide for this example problem on shear key. It checked concrete breakout under tension + shear interaction. Ensure Nua/(phi*Nn)+Vua/(phi*Vn)<1.2. Using Vn as the shear key concrete strength and Nn as anchor bolt tensile strength.

My question is: Is concrete breakout tension+ shear interaction still needed in my case: when tension reinforcement is sufficient?

Appreciate the help!

 

[BulbTheBuilder]

Is concrete breakout tension+ shear interaction still needed in my case: when tension reinforcement is sufficient?

If the utilization ratio of tension is less than or equal to 0.2, then it can be ignored. I think that is somewhere in the ACI chapter 17

 

[KootK]

My question is: Is concrete breakout tension+ shear interaction still needed in my case: when tension reinforcement is sufficient?

In general, I worry that it is logically inconsistent to assume that a tension breakout frustum develops to engage the tensile reinforcement but that such a cracking pattern would not negatively impact a shear breakout frustum that is not reinforced for. Frankly, this is an aspect of anchorage design that I've not seen covered in the literature in any explicit way.

In your particular situation, with a shear lug, I would be less worried about this aspect of things as the cracking patterns associated with tension breakout and shear breakout would mostly be independent of one another I feel. This, envisioning the kind of conventional shear key setups that I'm familiar with. Ev Even this is a bit questionable, however, if one is considering a reversible moment connection situation.