We are to replace the 5th, 6th, and roof with steel members which we want STAAD to select. How could I run it if I want these floors to be designed by STAAD and just analyze the reinforced concrete below. I tried assigning first the 5th, 6th, and roof to steel beams and columns, after which proceeded with the design of steel members. I ran the analysis and this was what it said "your model contains instructions for member selection or optimization and/or grouping. These are not followed by an instruction for re-analysis..."
Attached below is the link of the file, this is the original, I haven't still replaced the 5th, 6th, and roof with steel here though. Could you check it out please? Would really be a big help. Thank you!
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Simultaneous analysis of concrete structure and design of steel frame
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