Applies To
	Product(s):	STAAD.Pro
	Version(s):	ALL
	Environment:	ALL
	Area:	General
	Subarea:
	Original Author:	Kris Sathia, Bentley Technical Support Group

I am doing some testing using the latest STAAD.Pro SS6 release and find that there are minor variations in results from previous versions. The results in SS6 does not exactly match those in the published in verification documents either. Can you please explain why ?

The AISC steel tables database in STAAD.Pro has undergone a change with effect from SS6 build 20.07.11.33. This was done to bring it to be in sync with the latest information published by AISC. So, the property values such as moments of inertia, radii of gyration, section modulus, etc., of many sections are marginally different from those published in older versions. This will hence cause the analysis and design results to be different by a small degree.

The default AISC database in the SS6 version of the program is based on a document published by AISC called
AISC Shapes database v14.1.xls

Older versions of STAAD ( SS5 and older ) used the information available in the AISC publication
AISC Shapes database v13.0-Current.xls

For the verification examples, the results presented in the STAAD verification manual are based on the old AISC databases.

In STAAD, you can change the AISC database to the old one using the Configuration-Section Profile Table menu of the program. Please refer to the picture below which illustrates the process. If you roll back to the old database called "AISCSections", you will find that the results from the current  version match the values published in the verification manual.