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Time period, Perform 3D

 
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s_saranya
SEFI Member
SEFI Member


Joined: 23 Oct 2020
Posts: 2

PostPosted: Fri Apr 23, 2021 6:27 am    Post subject: Time period, Perform 3D Reply with quote

Hello every one,


The fundamental time period should be same in SAP and Perform 3D?
I got fundamental time period as 0.48s in SAP but in perform 3D it is 0.68s for the same model?
Is it allowed?
If its not, what could be the possible error?


Thank you
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VPandya
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Joined: 09 Nov 2009
Posts: 825

PostPosted: Wed Apr 28, 2021 4:45 am    Post subject: PLOT MODE DEFLECTED SHAPE . MAKE SURE INPUT PROPERTIES ARE SAME . Reply with quote

Dear Er. S_saranya,

Fundamental Period is the basic  dynamic property of any Structure . You can have only one correct number ( ANSWER ) ,  no matter what software  you are using .  PLOT THE DEFLECTED SHAPE OF THE MODE YOU ARE CALLING FUNDAMENTAL MODE. That can tell you if you are getting Fundamental Mode shape in both cases .


SIMPLY STATED ONE ANSWER IS RIGHT AND OTHER WRONG .  PLOT THE DEFLECTED SHAE OF WHAT YOU CALL FUNDAMENTAL MODE .  IT IS EASY TO CATCH .  Make sure all your input properties ( INPUT FILES ) are same in both cases .

FUNDAMENTAL MODE  IS USUALLY  A  VERTICAL CANTLEVER BEAM DEFLECTED SHAPE  FOR HIGH RISE BUILDINGS .



Regards.

Vasudeo Pandya  P.E.
Structural Engineer
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