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to calculate participation factor, you first do modal analysis.. from first mode.. take the eigen values that would be the mode shapes at each storey... Take storey mass of each storey and solve it manually or using excel file.. By the way, if you want performance point, you can directly get from the SAP result where it shows caapcity and demand spectra. See the attached research paper for ur reference IRJET-V3I5479.pdf

Salam, What is the difference between the under reinforced and tension controlled section? Are they same with the exception of strain values of steel.? Many Thanks

Great question. Current ACI design (2002 onwards) is based on strain limit and based on that you end up with tension controlled or compression controlled sections. Tension controlled being the sections where strain is steel is equal or greater than the limit provided by code (0.005 I believe). Previously (1963 to 2002), the reinforcement design was based on reinforcement ratios. This is where the terminology "under-reinforced", "over reinforced" and "balanced reinforcement" comes from. The simplest word to put this is that any steel that has strain greater than 0.005 (or whatever the code says) at time of concrete failure is termed as tension controlled. Both under-reinforced and balanced reinforcement sections will meet this criteria.

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Salam Alaikom fellow Engineers! I have found the "The Seismic Performance of RC Frame Buildings with Masonry Infill Walls" article very useful. So I would like to share it with you, especially for junior structure design engineers. Regards The Seismic Performance of RC Frame Buildings with Masonry Infill Walls.pdf