T.2 Specifying the analysis type
The analysis type for this structure is called P-Delta.
Since this problem involves concrete beam and column design per the ACI code, second-order analysis is required and has to be done on factored loads acting simultaneously. The factored loads have been created earlier as cases 4 and 5. Now is the time to specify the analysis type.
The STAAD input file commands generated are:
PDELTA ANALYSIS SMALLDELTA