بررسي اثرات ميراگرهاي مايع هماهنگ شده د ركاهش پاسخ لرزه اي ساختمان هاي برشي

Effects of Tuned Liquid Dampers (TLD) on Damping Shear-type Building Vibrations

The Tuned Liquid Damper (TLD) is nowadays increasingly being used as an economical and effective passive vibration absorber. This research focuses on modeling tall buildings equipped with Tuned Liquid Dampers (TLDs) subjected to strong ground motions. Strong excitation can lead to the wave breaking phenomenon and make turbulence in shallow rectangular tanks which could, in turn, contribute to additional damping due to TLDʹs. Wire screens placed inside the liquid tank can play an important role in reducing the structural response due to increased inherent damping of the structure. In this study, a simple method is introduced for modeling this type of Tuned Liquid Damper by using Equivalent Amplitude Dependent Tuned Mass Damper. The method is based on equalizing dissipated energies in both devices. Equations of motion for shear-type buildings equipped with nonlinear Amplitude Dependent Tuned Mass Dampers are developed. A complex modal analysis procedure is used to solve the governing equations. Coupling of TMD properties and structural response is solved with iteration on structural response and updating TMDʹs properties. Performing a set of parametric studies on a practical 10-storey building equipped with TLDs subjected to different ground excitations showed that the TLD significantly reduced the seismic response (displacement and base shear) of the structures when the Tuned Liquid Damper was tuned to the natural frequency of the structure considering the hardening behavior of TLD