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E-Tabs Analysis , Modal Participation Factor and P-Delta Effect Relation

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Vshah97

Structural
Jun 21, 2023
3
Hello All,

This has been brought up many times in my mind. When we are analyzing multi story buildings (15,20,30 etc.) in E-tabs, we are supposed to check Modal Mass Participation factor in order to see if Torsion governs first two modes or not. Do we have to check this while keeping P-Delta "ON" or "Off"? In my opinion this check of Modal Mass Participation is Serviceability check, whereas P-delta is simply a design consideration.

Additionally, does the code say anywhere, what sort of P-Delta analysis has to be carried out? In E-tabs there are two options, Non - Iterative or Iterative. If we do Iterative analysis, where does the code specify factors for each defined load case (DL,LL,EQ)?
 
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