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USD was a 5+ page (6" X 9") appendix in the 1956 ACI Code.  In the 1963 code 
it was moved into the main body of the code with each chapter containing a 
WSD and a USD section.  In the 1971 ACI Code (large format pages), WSD was 
referred to as "Alternate Design Method" in Section 8.10.  In the 1977 ACI 
Code, WSD is included in Appendix B as an "Alternate Design Method," 
consisting of 4+ pages.

Working for a local consultant while doing graduate work in 1960, he insisted 
on using USD, albeit his approach was quite unusual.

Working for the Arizona Highway Department Bridge Division in 1964-66, all 
concrete design was by WSD.  Building design was basically a mixture of WSD 
and USD at that time.

Hope this helps.

Old timer A. Roger Turk, P.E.(Structural)
Tucson, Arizona

CarlS95(--nospam--at) wrote:

. > Question No. 2 for the oldtimers:
. > 
. > How long did it take for concrete Ultimate Strength Design to take hold 
. > once it was codified?  Are we ahead or behind that schedule with LRFD?
. >