09 September 2014 2 5K Report

I have a hollow tapered vertical tower..I have developed stiffness matrix considering translational and rotational using the function defined in BATHE's book..but, since I need to use tuned liquid column damper at the top, I have to develop stiffness matrix in such away that only translational motion along horizontal should be considered. Can you suggest any method? I couldn't find any suitable method. I tried to do in ansys also using beam 54 element restricting ROTZ and UY..but my frequencies are not matching with the previously calculated frequency.

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