چکيده

 Simulations conducted on single degree of freedom structures (SDOFs) connected rigidly to a tuned liquid damper (TLD) under various excitations show that TLD can reduce structural response to these excitations considerably if properly designed. TLD is a rectangular (or circular) rigid tank partly filled with water where its sloshing frequency is tuned to natural frequency of structure. As increasing the base excitation level, TLD is more efficient, which is because of more energy dissipation via sloshing and wave breaking. A conventional TLD is generally tuned to a single frequency. Because of this limitation, the TLD usually is used to control the structural response of semi-SDOF structures. Overcoming this drawback, some standing baffles are suggested to be installed inside the TLD which can rotate around their vertical axis. The numerical simulations show that these baffles can change the damping ratios, frequency of sloshing and sloshing forces especially in baffles orientation between 30 to 50 degrees. This can be utilized to make the TLD, variably tuned liquid damper.