higher frequencies

[Gholamreza]

Hello everyone,
I modeled that 3story SAC building and did the eigen analysis for the 3 modes. The first frequency is exactly matched with the references that I have, but the frequencies for mode 2 and 3 are different with my reference. the frequency of mode 2 is about 0.1 and the frequency of mode 3 is about 0.8 less than my reference. I checked all the mass, stiffness and everything seems correct to me. Any idea that what might cause this problem ? (As I go to higher modes frequencies my periods and frequencies will be more different from my reference).

[selimgunay]

If the mode shapes are available in the reference, please check those against yours.

[Gholamreza]

Hello Selimgunay,

Thanks for the response. I think my problem is beam-column connectivity. I will appreciate if you could take a look at what I explained in the link below:

http://opensees.berkeley.edu/community/ ... =2&t=65132

[Prafullamalla]

Can you share your reference and tcl file. I wanna give try.