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  1. Vshah97

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

    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...
  2. Vshah97

    Stiffness Reduction Factors for Prestressed Beams

    For general concrete beam design we use 0.35Ig as our stiffness modification factor for the analysis, what is the stiffness reduction factor we have to use per Code for Prestressed Beam analysis, I know 0.35 is ok to use and conservative, but if I want to push it, what does the codes say for this?

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