Behavior of Sloped-Bottom Tuned Liquid Dampers
Publication: Journal of Engineering Mechanics
Volume 127, Issue 3
Abstract
The performance of a tuned liquid damper (TLD) with a sloped bottom of an angle of 30° with the horizontal is investigated experimentally. The sloped-bottom TLD was found to be just as effective in dissipating energy as the familiar box-shaped TLD. While the liquid motion of a box-shaped TLD resembles that of a hardening spring, the behavior of the sloped-bottom TLD resembles that of a softening spring. These different behaviors are due to different nonlinear effects: the amplitude dispersion effect and the wave runup effect onto the sloped surface, respectively. The sloshing force created by the motion of the sloped-bottom TLD was found in limited shaking table experiments to be comparable with that created by the equivalent box-shaped TLD, even though the net fluid mass of the sloped-bottom TLD is less than one half that of the box-shaped TLD. This behavior appears to be caused by the greater effective liquid mass involved in the sloshing motion in the sloped-bottom TLD.
Get full access to this article
View all available purchase options and get full access to this article.
References
1.
Chaiseri, P., Fujino, Y., Pacheco, B. M., and Sun, L. M. ( 1989). “Interaction of tuned liquid damper (TLD) and structure—theory, experimental verification and application.” Struct. Engrs./Earthquake Engrg., Tokyo, 6, 273–282.
2.
Chapman, R. D., and Monardo, F. M. ( 1991). “APL wave gage system.” Rep. No. S1R-91U-041, Applied Physics Lab., Johns Hopkins University, Baltimore.
3.
Fujino, Y., Pacheco, B. M., Chaiseri, P., and Sun, L.-M. ( 1988). “Parametric studies on tuned liquid damper (TLD) using circular containers by free-oscillation experiments.” Struct. Engrs./Earthquake Engrg., Tokyo, 5, 381–391.
4.
Fujino, Y., Pacheco, B. M., Chaiseri, P., Sun, L.-M., and Koga, K. (1990). “Understanding of TLD properties based on TMD analogy.”J. Struct. Engrg., Tokyo, 36, 036A, 577–590 (in Japanese).
5.
Fujino, Y., Sun, L., Pacheco, B. M., and Chaiseri, P. (1992). “Tuned liquid damper (TLD) for suppressing horizontal motion of structures.”J. Engrg. Mech., ASCE, 118, 2017–2030.
6.
Gardarsson, S. ( 1997). “Shallow-water sloshing.” PhD thesis, University of Washington, Seattle.
7.
Koh, C. G., Mahatma, S., and Wang, C. M. ( 1994). “Theoretical and experimental studies on rectangular liquid dampers under arbitrary excitations.” Earthquake Engrg. and Struct. Dyn., 2, 17–31.
8.
Lepelletier, T. G., and Raichlen, F. (1988). “Nonlinear oscillations in rectangular tanks.”J. Engrg. Mech., ASCE, 114(1), 1), 1–23.
9.
Mei, C. C. ( 1983). The applied dynamics of ocean surface waves, Wiley, New York.
10.
Reed, D., Yu, J., Yeh, H., and Gardarsson, S. (1998). “Investigation of tuned liquid dampers under large amplitude excitation.”J. Engrg. Mech., ASCE, 124(4), 405–413.
11.
Sun, L. M., Fujino, Y., Pacheco, B. M., and Isobe, M. ( 1989). “Nonlinear waves and dynamic pressures in rectangular tuned liquid damper (TLD)—simulation and experimental verification.” Struct. Engrs./Earthquake Engrg., Tokyo, 6, 251–262.
12.
Tamura, Y., Kousaka, R., and Modi, V. J. ( 1992). “Practical application of nutation damper for suppressing wind-induced vibrations of airport towers.” J. Wind Engrg. and Ind. Aerodyn., 41/44, 1919–1930.
13.
Yalla, S., and Kareem, A. ( 1999). “Modelling tuned liquid dampers as sloshing-slamming dampers.” Wind Engrs. into the 21st Century: Proc., 10th Int. Conf. on Wind Engrg., Copenhagen, 1569–1575.
14.
Yeh, H., and Chang, K.-T. ( 1994). “On propagation of edge-wave packets.” Proc., Waves—Phys. and Numer. Modeling, M. Isaacson and M. Quick, eds., University of British Columbia, Vancouver, 270–279.
15.
Zelt, J. A. ( 1986). “Tsunamis: the response of harbors with sloping boundaries to long wave excitation.” W. M. Keck Lab. Rep. No. KH-R-47, California Institute of Technology, Pasadena, Calif.
16.
Zhao, Z., and Fujino, Y. (1993). “Numerical simulation and experimental study of deeper-water TLD in the presence of screens.”J. Struct. Engrg., Tokyo, 39, 699–711.
Information & Authors
Information
Published In
Journal of Engineering Mechanics
Volume 127 • Issue 3 • March 2001
Pages: 266 - 271
History
Received: Jul 23, 1999
Published online: Mar 1, 2001
Published in print: Mar 2001
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.