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 D?? If your embedment depth is limited, it forces you to increase the anchor diameter in order to achieve the required adhesive bond strength, which then drives up your required anchorage force due to ductile failure of the anchor itself. Seems like a catch-22, and one that I don't agree with. I could see that if you were specifying a 1/2" dia. anchor that was 8 ft. long you wouldn't necessarily be able to activate the rod at it's very end, but the embedment values that you can specify in the anchor design programs seems to be VERY conservative. Does anyone know what that stems from? Thanks!
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