Since the changes in the 2009 IBC for anchor rods in concrete (ACI 318 Appendix D), I have had trouble designing an anchor for the largest of Simpson's holddowns. Using the Simpson SSTB and SB anchors, the capacity of the anchor is less than 10k for a corner application in SDC C-F. The highest loads in a residence are generally in the corners, and are often higher than 10 kips if the house is narrow or has a lot of glass. What do you recommend for anchorage for holddowns in the 15 kip range? In most of the houses I'm designing, the concrete foundation walls are anywhere from 2' to 8' tall and 8" thick.
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