Last modified: 2013-05-10
Abstract
Similar to a tuned mass damper (TMD) device, tuned liquid damper (TLD) devices can reduce resonant vibrations of a structure by modifying its frequency response function. In the structure-TLD system, the secondary mass is liquid and the damping forces primarily result from the motion of liquid through energy dissipating device such as damping screens. The primary difference from a TMD is the amplitude dependent nature of a TLD. To the best of the author’s knowledge, no previous study has considered structural control of tall buildings using semi-active TLDs. It would be beneficial to provide TLDs with variable damping that can be adjusted through a certain mechanism to achieve an optimal control performance over a wide range of loading conditions in a semi-active mode of control. In this paper, a control strategy based on a gain scheduling scheme is utilized by controlling the inclination angle of the damping screen(s) and consequently the screen loss coefficient value(s). The gain scheduling control strategy is employed on a three dimensional single-story structure equipped with a semi-active TLD in order to maintain the optimal damping value (ζ_(TLD-opt)) based on a prescribed look-up table. Finally, results are assessed with scaled experimental values for conventional passive TLDs.
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