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?
I just checked the primary loads for the cases mentioned since the trial item was big, but most likely the results are not far from what I originally reported. And for all the cases done, the significant differences was consistently ONLY in the Wind Load Cases. I do hope we can clarify this matter soon. Thank you!
After further investigation I noted that there is a slight difference in the wind loads generated on the members between different versions. It looks like some wind loads were not correctly generated on version 22.04.00.40. I will check this with the development team and get back to you.
It sounds strange that a difference of 0.3% in bending moment could change the design results significantly. How exactly are the design results different between 2 versions (when the model is without TRUSS spec)?
It's the effect of this difference in the output that is significant especially under Direct Analysis. Members that passed in Update4 are now failing in Update5. We are still taking a look at what else could have changed but your help would be great to hasten the investigation. This is actually the first time we encountered significant differences in the output of STAAD versions.
It seems that wind load generated between both models is slightly different. I will try to figure out why this happens. However, is a difference of about 0.3% really so significant?