There are significant changes between B31.4 2006 and B31.4 2016. The code stress equations have changed, a new one was added, and the allowable stress values changed.
Compare both Code books and you will see these changes. Running the same job in CAESAR II v.8.00 (which implemented B31.4 2006) and then again in CAESAR II v.9.00 (which implements B31.4 2016) will yield different results.
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Regards,
Richard Ay - Consultant