Seismic Control of Structures Using Tuned Liquid Dampers (TLD) Adaptable with Water Level
Subject Areas : Analysis of Structure and Earthquake
Nakisa Azari
1
,
Farshid Fathi
2
1 - Department of Civil Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran.
2 - Faculty Member, Department of Civil Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran.
Keywords: Nonlinear Time History Analyses, Passive control, Earthquake, Tuned Liquid Damper, Adaptable Tuned Liquid Damper, Structural Response,
Abstract :
Tuned Liquid Dampers (TLD) are widely utilized today because of their simple structure, no need for external energy sources and low construction and implementation costs. They have also been used effectively to reduce the responses of structures against the earthquake excitation. By adjusting the water level, inside the TLD tank, so that the vibration frequency of the fluid is equal to the main frequency of the structure, the best efficiency is obtained for this passive control system in reducing the response of the structures. Many efforts have been undertaken to make this type of damper usable even under normal conditions, so that to be used as a water storage tank for the buildings. However, in such case, due to the variable level of water consumption in the damper tank, its efficiency will not necessarily be high at the time of an earthquake. Therefore, the purpose of this paper is to introduce an improved model, instead of conventional TLD, that perform the best efficiency in reducing structural responses at the different water levels in the reservoir. For this purpose, by applying seven earthquake records to the studied analytical model, the efficiency of two control systems has been compared with each other. The results of nonlinear time history analyses indicate that the maximum building responses in the proposed control system have been effectively reduced, for the different reservoir water levels, compared to the conventional TLD system.
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