Seismic Response of Isolated Elevated Water Tanks
Publication: Journal of Structural Engineering
Volume 125, Issue 9
Abstract
The paper presents the results of an analytical investigation of the seismic response of isolated elevated water tanks. A discrete three-degree-of-freedom model of the isolated structure is presented that includes the isolation system, tower structure, and sloshing fluid. Fluid-structure interaction is modeled using the mechanical analogy proposed by Housner. The model captures the salient features of the system response, yet is still amenable to closed-form solution. The natural frequencies and mode shapes are determined, and a response spectrum analysis is conducted. Results are investigated for the full range of tank capacities and height-to-diameter ratios found in practice and for the full range of fluid elevations. Results of the isolated elevated tank are compared to the corresponding fixed-base tank design and indicate that seismic isolation is effective in reducing the tower drift, base shear, overturning moment, and tank wall pressure for the full range of tank capacities. Isolation is most effective for the smallest capacity tank; however, in this case, a single mode solution for the isolated structure is not adequate, as the fluid motion contributes significantly to the overall structural response. Isolation does, however, increase the relative convective fluid displacement in the tank.
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References
1.
Aiken, I. D., et al. (1992). “Experimental studies of the mechanical characteristics of three types of seismic isolation bearings.” Proc., 10th World Conf. on Earthquake Engrg., Balkema, Rotterdam, The Netherlands, 2281–2286.
2.
Beyer, W. H. (1987). CRC standard mathematical tables, 28th Ed., CRC, Boca Raton, Fla.
3.
Bleiman, D., and Kim, S. (1993). “Base isolation of high volume elevated water tanks.” Proc., Seminar on Seismic Isolation, Passive Energy Dissipation, and Active Control, ATC 17-1, Applied Technology Council, Redwood City, Calif.
4.
Bo, L., and Jia-xiang, T. (1994). “Vibration studies of base-isolated liquid storage tanks.” Comp. and Struct., 52(5), 1051–1059.
5.
Chalhoub, M. S., and Kelly, J. M. (1990). “Shake table test of cylindrical water tanks in base-isolated structures.”J. Engrg. Mech., ASCE, 116(7), 1451–1472.
6.
Chopra, A. K. (1995). Dynamics of structures theory and applications to earthquake engineering. Prentice-Hall, Englewood Cliffs, N.J.
7.
Epstein, H. I. (1976). “Seismic design of liquid-storage tanks.”J. Struct. Engrg., ASCE, 102(9), 1659–1673.
8.
Haroun, M. A., and Housner, G. W. (1981). “Seismic design of liquid storage tanks.”J. Tech. Councils, ASCE, 107(1), 191–207.
9.
Housner, G. W. (1957). “Dynamic pressures on accelerated fluid containers.” Bull. Seismological Soc. of Am., 47(1), 15–37.
10.
Housner, G. W. (1963). “The dynamic behavior of water tanks.” Bull. Seismological Soc. of Am., 53(2), 381–387.
11.
Malhotra, P. K. (1997a). “Method for seismic base isolation of liquid storage tanks.”J. Struct. Engrg., ASCE, 123(1), 113–116.
12.
Malhotra, P. K. (1997b). “New method for seismic isolation of liquid-storage tanks.” Earthquake Engrg. and Struct. Dyn., 26, 839–847.
13.
Malhotra, P. K. (1998). “Seismic strengthening of liquid-storage tanks with energy-dissipating anchors.”J. Struct. Engrg., ASCE, 124(4), 405–414.
14.
NEHRP recommended provisions for seismic regulations for new buildings. (1997). Federal Emergency Management Agency, Washington, D.C.
15.
Newmark, N. M., and Rosenblueth, E. (1971). Fundamentals of earthquake engineering. Prentice-Hall, N.J.
16.
Uniform building code. (1997). International Conference of Building Officials, Whittier, Calif.
17.
Veletsos, A. S., and Yang, J. Y. (1977). “Earthquake response of liquid storage tanks.” Proc., Advances in Civ. Engrg. Through Engrg. Mech., ASCE, New York, 1–24.
Information & Authors
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Published In
Journal of Structural Engineering
Volume 125 • Issue 9 • September 1999
Pages: 965 - 976
History
Received: Aug 20, 1998
Published online: Sep 1, 1999
Published in print: Sep 1999
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