We have tried to compare the results of V22.04.00.40 & V22.05.00.131 prior to shift to the latest update - same STAAD file (no modifications).
As shown in the snapshot, significant post-processing output differences were found.
The largest differences noted were on the Wind Load Cases.
The STAAD Generated Wind Load values, however, were found to be the same.
So it must be a change in the calculation/routine that caused the significant difference.
Can anyone please clarify the wind load calculation procedure for Update 5?
Could you please attach the related STAAD.Pro model?
I have uploaded the file through the Communities Secure File Upload.
I tried to compare the results between the version 22.05.00.131 and 22.04.00.40, but could not find such differences. Could you please illustrate the differences with a screenshots from STAAD.Pro? Or indicate exactly which Load Cases (or Load Combinations), which nodes (or members) are you comparing?
I have uploaded the excel file I used for comparison. Basically I just got the post-processing results from the analysis of both versions, no other modification.
After further investigation it appears that this difference exists due to a defect introduced in STAAD.Pro version 22.05.00.131 where some modifications to the TRUSS specification were implemented. More details can be found here: https://communities.bentley.com/products/ram-staad/f/ram-staad-forum/205770/new-staad-version-22-05-00-131-giving-different-results/624523#624523
As far as I can see, this issue will be addressed in the upcoming STAAD.Pro release.
Meanwhile, changing TRUSS spec to member releases should give the same results between both versions.