Tuned liquid damper (TLD) is a type of tuned mass damper (TMD) where the mass is supplanted by a liquid 
(usually water). In this paper, performance of TLD that reduces the displacement and acceleration resulting 
from wind and earthquake lateral forces in tall buildings is studied. Experimental works have been 
conducted on three 10 stories steel building models with scale of 1/25 with and without water tanks. A 
dynamic ramp wave force with frequency of 1.5 Hz and amplitude of 2 mm is applied on each model using 
a horizontal shaking table. The results of the accelerometers and linear variable differential transformers 
(LVDTs) installed at the tenth floor of the models are recorded. It was found that the 8%, 15% and 11.5% 
weight of water tank to weights of structures can minimize the acceleration response and top floor 
displacement for the three tested models by 23 %, 48% and 18.2%, respectively. Also, the calculated 
damping ratio for model 2 is 1.9 %.