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

Document Type : Research Article

Authors

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

Abstract

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%.

Keywords

Main Subjects

References

[1]T. Sato, Tuned sloshing damper, Japan Journal of Wind Engineering, 32 (1987) 67-68.
[2] V. Modi, F. Welt, Damping of wind induced oscillations through liquid sloshing, Journal of Wind Engineering and Industrial Aerodynamics, 30(1-3) (1988) 85-94.
[3] M. Tait, Modelling and preliminary design of a structure-TLD system, Engineering Structures, 30(10) (2008) 2644-2655.
[4] A. Marsh, M. Prakash, S. Semercigil, Ö. Turan, A shallow-depth sloshing absorber for structural control, Journal of Fluids and Structures, 26(5) (2010) 780-792.
[5] A.S. Zahrai. S.M, Numerical Study of Using Diamond Metalic Damper for Seismic Retrofit of Medium-rise Steel Frames, Journal of Modeling in Engineering, 15 (2007) 9-19.
[6] S.H. Mohebbi. M, Optimal Design of Active Multiple Tuned Mass Dampers )AMTMDs( For Nonlinear Hysteretic Structures, Journal of Modeling in Engineering, 48(2017) 151-163.
[7] A.J. Kordi. F, The TMD design based on complex stiffness theory, Journal of Modeling in Engineering, 51 (2017) 10-10.
[8] J.Y. Lou, L.D. Lutes, J.J. Li, Active tuned liquid damper for structural control, in:  Proc. 1st World Conf. on Struct. Control, 1994, pp. 70-79.
[9] Y. Xin, Seismic performance of mass-variable tuned liquid dampers with particles fluidization in building applications, University of Missouri-Rolla, 2006.
[10] S.M. Gardarson, Shallow-water sloshing, Ph.D. thesis, University of Washington, Serttle, (1997).
[11] D. Reed, J. Yu, H. Yeh, S. Gardarsson, Investigation of tuned liquid dampers under large amplitude excitation, Journal of engineering mechanics, 124(4) (1998) 405-413.
[12] Y.-K. Ju, Structural behaviour of water sloshing damper with embossments subject to random excitation, Canadian Journal of Civil Engineering,31(1)(2004)120-132.
[13] M. Tait, A. El Damatty, N. Isyumov, M. Siddique, Numerical flow models to simulate tuned liquid dampers )TLD( with slat screens, Journal of Fluids and Structures, 20(8) (2005) 1007-1023.
[14] K.P. You, Y.M. Kim, C.M. Yang, D.P. Hong, Increasing damping ratios in a tuned liquid damper using damping bars, in:  Key Engineering Materials, Trans Tech Publ, 2007, pp. 2652-2655.
[15] J. Love, M. Tait, Nonlinear simulation of a tuned liquid damper with damping screens using a modal expansion technique, Journal of Fluids and Structures, 26(7-8) (2010) 1058-1077.
[16] S.M. Zahrai, S. Abbasi, B. Samali, Z. Vrcelj, Experimental investigation of utilizing TLD with baffles in
[17] Z. Zhang, B. Basu, S.R. Nielsen, Tuned liquid column dampers for mitigation of edgewise vibrations in rotating wind turbine blades, Structural Control and Health Monitoring, 22(3) (2015) 500-517.
[18] M.A. Goudarzi, P.N. Danesh, Numerical investigation of a vertically baffled rectangular tank under seismic excitation, Journal of Fluids and Structures, 61 (2016) 450-460.
[19] R.O. Ruiz, D. Lopez-Garcia, A.A. Taflanidis, Modeling and experimental validation of a new type of tuned liquid damper, Acta Mechanica, 227(11) (2016) 3275-3294.
[20] H. Enayati, S.M. Zahrai, A variably baffled tuned liquid damper to reduce seismic response of a fivestorey building, Proceedings of the Institution of Civil Engineers-Structures and Buildings, 171(4) (2018) 306-315.
[21] S. Das, S. Choudhury, Seismic response control by tuned liquid dampers for low-rise RC frame buildings, Australian journal of structural engineering, 18(2) (2017) 135-145.
[22] S. Ali, M.A. Kamran, S. Khan, Effect of baffle size and orientation on lateral sloshing of partially filled containers: a numerical study, European Journal of Computational Mechanics, 26(5-6) (2017) 584-608.
[23] N. Cavalagli, C. Biscarini, A.L. Facci, F. Ubertini, S. Ubertini, Experimental and numerical analysis of energy dissipation in a sloshing absorber, Journal of Fluids and Structures, 68 (2017) 466-481.
[24] S. Mazzoni, F. McKenna, M.H. Scott, G.L. Fenves, OpenSees command language manual, Pacific Earthquake Engineering Research (PEER) Center, 264 (2006).
[25] F. Sétra, Assessment of vibrational behaviour of footbridges under pedestrian loading, Technical guide SETRA, Paris, France,  (2006).
[26] C. Chang, Mass dampers and their opسtimal designs for building vibration control, Engineering Structures,21(5)(1999) 454-463.
 
Amirkabir Journal of Civil Engineering
Volume 52, Issue 5
August 2020
Pages 1047-1060

Files

Share

How to cite

Statistics