Effects of TLD on suppressing the dynamic responses of a multilayer structure

Abstract

Two different Tuned liquid dampers (TLDs) were installed on the floors of a three-floor structure. The TLD natural frequencies were tuned to the first two resonance frequencies of the structure, and its base was subjected to harmonic excitation. The excitation frequency of the sweep tests ranged from 0.8 to 3.2 Hz, and the mass ratio for all the simulations was constant and equalled 2%. The FVM/FEM method was used to solve the fluid-structure coupling, and the maximum displacement of the three floors were obtained. The dissipated energy by damping force was used to study the coupling mechanism of TLD and multilayer structure. Findings indicated that the scheme of the multiple-TLD design was stable and effective, which ensured that the structure-TLD system under the same mass ratio had no local adverse effects. The proportion of positive work time of tank hydrodynamic force is the intuitive embodiment of TLD damping performance. The frequency doubling effect generated by the sloshing nonlinearity in TLD has been confirmed for use in the vibration control of higher-order modes of structures. On the premise of constant mass ratio, it is suggested to adopt a multi-TLD damping system, in which each damper is installed at the height of the maximum displacement of each structural mode.