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

rxh241 said:

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

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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

OP said:

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

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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.