The tuned liquid column damper (TLCD) is a passive control device that consists of tube like con-tainers filled with liquid, preferably water. The damping in a liquid column is amplitude-dependent and consequently nonlinear. Most of the previous studies concentrated on the equivalent lineariza-tion technique and replace the nonlinear damping term with the linear one. This may cause that the prediction of the optimal parameters for the TLCD design does not be accurate. In this study He’s homotopy perturbation method (HPM) and variational iteration method (VIM) are applied to find better approximate solution for the structure-TLCD equations. This new method is utilized to solve the equation of motion of a building modeled as a single degree of freedom (SDOF) system coupled with the equation of motion of the liquid in the column of the TLCD and subjected to a harmonic type of wind excitation. This new technique leads to achieve more reliable solution for the TLCD design. Present solution gives an expression which can be used in wide range of time for all domain of response. After that the Citicorp Center which has a very flexible structure is used as an example to illustrate the design procedure of the TLCD and demonstrate the perfor-mance of the TLCD in effectively reducing vibrational response under the wind excitation.

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