Can you use anchor reinforcement with Post Installed Anchors? 3

[MJC6125]

I've use the Design of Pedestal Anchorage paper by Windianto in the past (link below for reference). I've only ever used it for cast in headed anchor bolts. I'm wondering if a similar methodology could be used with post installed anchors (specifically threaded rod epoxy anchors with deep embedment)? Is there something different about a properly installed epoxy anchor that would create a different concrete breakout cone or something else that would not satisfy the assumptions of this design methodology?

My specific situation that I'm trying to justify anchor reinforcement for is slightly different than pedestal anchorage, but I'm wondering if I can do something similar with tension breakout out cone anchorage. I have an anchor drilled into the top of an 8" thick concrete wall that has about 5 kips of tension force on it. If I satisfy all of the ACI Chapter 17 anchor design equations except for concrete breakout, can I use the existing vertical reinforcement in the concrete wall to resist the concrete breakout? See image below for reference.

Link to Paper: Link

Image:

 

[KootK]

Any notable challenges?

To meticulously follow it through with reinforced concrete principals, for something like this, is to effectively prosecute a strut and tie design. And most strut and tie designs are a pain in the butt in my opinion. The usual challenges:

1) Developing a credible shear resistance mechanism.

2) Anchorage where you need it.

3) Passing bar forces laterally while maintaining a complete load path.

4) Demonstrating that a threaded anchor rod is equivalent to knurled rebar in whatever ways matter.

5) Dealing with things in 3D when required.

....

Yeah, you probably just need to dive in and see how it goes. You're probably our official world expert now.

 

[KootK]

When you imagine the breakout cone of an epoxy anchor you wouldn't find a portion of the bottom of the bar that pulled free from the cone, so why wouldn't the cone start at the bottom of the anchor?

I believe that it is in fact possible for the bar to be pulled loose from the mass of concrete that would have been the failure cone had the failure cone otherwise extended to the bottom of the bar. Stuff like this.

 

[r13]

If everything done properly, my vote goes for (f).

 

[RFreund]

@Kootk - Thanks for the responses. Where is that image from?
I'll get back to the "challenges" after some further thought.

EIT

http://www.HowToEngineer.com

 

[KootK]

I believe this to be the APP.D source document effectively.