Thanks for the response and background. Yes, I've considered talking w/ Hilti or Simpson directly, but it can sometimes take a bit of work to find the person who can actually answer the question, so I thought I'd look to the forums first.
No, I haven't gotten too deep into the background philosophies of the limited anchor embedment length. I was actually just being lazy in the hopes that someone else had some information I could access easily. But thanks for the response and the suggestions. Hopefully someone else out there...
I've been struggling w/ the design of retrofit concrete anchors using the Simpson and Hilti software packages, and am wondering what the rationale is for why you can't increase the anchor embedment length of the anchor to the point at which you can satisfy the ductility requirements of Appendix...
