STORY STIFFNESS

I would like to know how staad calculate story stiffness?

I am using FLOOR DIAPHRAGM and PRINT STORY STIFFNESS to get story stiffness from staad.

Now suppose structure with 5 floor and same height. All column and beam are of same size. When I check story stiffness result why they differ floor to floor when all floor are similar?

Kindly reply.

Regards,

PNSTORY STIFFNESS.std

Parents
  • Please find the attached document which explains the process of calculation of storey stiffness in the presence of rigid floor diaphragm.



  • Thank you for your kind reply.
    In attached file structure has 5 floor. Each floor have 3m height. All column and beam have same property.
    I suppose to get same story stiffness from staad. But result are giving varying stiffness floor wise. Why is it so?
    Kindly go through attached file.
    Regards,
    PN
  • I mean to say if we use equation 12EI / L3. It should result in same story stiffness for all floors.
    Regards,
    PN
  • Please refer to the document that I have attached. Storey stiffness is calculated from the relative displacements of the centre of mass of each floor. A sample calculation has also been explained.



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