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Jummybear

Modal analysis of r/c tall building (~30 floors)

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Dear all,

I am working now on a 30 floor tall building. I run a modal analysis and get 1 mode or 1 and 2 mode as a buckling of local element - r/c wall, which is a part of rigidy core. Usually I get first 2 forms for the whole building in Y or X direction and third one is twisting one. First time I get local buckling in first modes. Should I fix it or I can ignore it? Your suggestions? I am not fimilar with tall building and fortunately this building is not my project for designing, but its a good opportunity to gain some experience in calculating such buildings.

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Participation mass is like what? Very low? I would eventually ignore that...

 

" Usually I get first 2 forms for the whole building in Y or X direction and third one is twisting one " I wish I could say that, but I guess the architetcts that I work to are crazy! :/

Edited by teixeiranh

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Yes, you are right. Participation of mass is low. See picture attached.

Capture8.jpg

 

Capture2.jpg

 

Did you get twisting mode as first one?

Edited by Jummybear

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