I know when I input seismic UBC/IBC seismic loads I should type Perform Analysis and Change after each load case.
The problem is, I am using National Building Code of Canada to generate seismic loads in my model and STAAD Pro still gives me the warning:" IF THIS UBC/IBC ANALYSIS HAS TENSION/COMPRESSION OR REPEAT LOAD OR RE-ANALYSIS OR SELECT OPTIMIZE, THEN EACH UBC/IBC CASE SHOULD BE FOLLOWED BY PERFORM ANALYSIS & CHANGE."
I don't have either of those commands in my STAAD model, who can kindly tell me what's wrong in the attached model? Thank you!