Thanks for all of the replies. I agree that this type of foundation is not ideal for PEMB frames but there are some clients who want this look and there is no getting out of it. I have taken IlliniPE's approach and designed the pier as a column and the results that I am getting seem reasonable...
Ausur, if the anchor bolts were extended down to where the hairpin is located would you still be worried about concrete breakout? I am struggling to see how a grade beam with tension ties would be much different from this design.
I have been working on a spreadsheet to help design footing sizes for PEMB's and I have come across an issue when the building columns are not at slab level. The company I work for uses hairpins to resist the kickout thrusts from the mainframes, but I am not quite sure how this works when the...