OK.
Here is the link for the demand/capacity ratios for the core columns. Don't ask me why they included this data in project # 6. I did not organize the NIST Report. Scroll to page 233
http://wtc.nist.gov/pubs/NISTNCSTAR1-6Draft.pdf
The average ratio is .484
Which translates to an average ~2.1 factor of safety. (Simply divide .484 into 1.0.