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?
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)?
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.
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!
Maybe I am misunderstanding this issue - what the percentage difference in the results which you are comparing? You keep calling it as significant, but I can find a very small differences only. Maybe I am comparing different things than you. Could you please clarify?
The summary I have shared is the differences of the post-processing outputs (support reactions, node displacements, beam end forces) from STAAD. From this table, we expect at most 0.005 differences in values from different versions. But for the comparison of Update 4 & Update 5 we got (based on the sample) an axial beam end force value which is +/-0.95kN in the Primary Load Case alone. This results to +/-400kN axial force after the direct analysis. Thus, members that previously had an Update4 ratio of 0.7 are now failing in Update5 due to the increase in forces. I hope that clarifies the matter, please let me know if it is still unclear :)