Comparison of seismic performance of variably baffled TLD and the optimal TMD

Document Type : Research Article


1 University of Zanjan Department of Civil Engg.

2 School of Civil Engineering,College of Engineering,university of Tehran,Tehran, Iran

3 Professor, Faculty of Civil Engineering, University of Tehran, Tehran, Iran


In this study, to improve the efficiency of TLD, a Variably Baffled Tuned Liquid Damper (VBTLD) has been used. The baffles are so that they divide the tank into three equal parts when they are fully closed. Furthermore, when they are open or partially closed, they can serve as some obstacles and improve the energy dissipation parameters. When this damper meets an excitation with a specific frequency, the baffles can be tuned to make the frequency of sloshing equal to that frequency. VBTLD used in this paper could be set for the frequency range from 1.73 to 3 times of a specific frequency. Compared to a simple TLD, VBTLD can be tuned to a range of frequencies to improve the performance of structure against external excitation. At first, the benchmark building was modeled in OpenSees, then the performance of the device was verified by previous test results. To examine the performance of VBTLD, Tuned Mass Damper (TMD) with optimal parameters was used in this study. Results showed that when the baffles are at the best angle, VBTLD with water depths of 42 mm has maximum response reduction for the numerical model subjected to the Kobe earthquake at intensities of 2, 4, 6, and 8% of the initial maximum acceleration of the earthquake (PGA=0.87g). The improvement of structural behavior compared to the optimal mass damper at maximum acceleration are respectively 23.1, 22, 14.6, and 10.5%, while for damper with water depths of 63 mm, they are respectively 8.17, 9.5, 6.7 and 6.8%.


Main Subjects

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