A Method for Seismic Protection of Liquid Storage Tanks by Disconnecting the Tank Wall from the Base and Using Energy Absorbing Circumferential Connection

Document Type : Research Article

Authors

1 Associate Professor, Structural Engineering Research Center, International Institute of Earthquake Engineering and Seismology (IIEES), Tehran, Iran

2 International Institute of Earthquake Engineering & Seismology (IIEES)

Abstract

Ground-supported cylindrical tanks are used to store a variety of liquids, e.g., water for drinking and fire-fighting, crude oil and liquefied natural gas. Tanks are critical components of modern industrial facilities and life-line systems, and must be designed to withstand safely the earthquakes to which they are subjected. The failure of such systems may lead to environmental hazard, loss of valuable contents, and disruption of fire-lighting elements following destructive earthquakes. Water storage tanks in particular, are important to the continued operation of water distribution systems in the event of earthquakes. Recent earthquakes have shown liquid storage tanks to be vulnerable to damage. Elasto-plastic shell buckling which is called “Elephant’s Foot” Buckling (EFB) has been the critical aspect in the earthquake resistant design or retrofit of steel, cylindrical tanks. In this paper, an innovative method based on using seismic energy absorbing connection at the base of tank wall is introduced to protect the liquid storage tank against seismic loads. In this method, the tank wall is fully disconnected from the base plate and the special connection is provided at the bottom of the tank. The connection is supported by a ring of rigid foundation and the base plate is supported directly on the ground. The seismic performance of the method is numerically examined for one broad and one slender steel tank. It is shown that this method can prevent the EFB of the tank wall by using the plastic deformation of the connection. Numerical results confirm the efficient performance of the proposed system to reducing seismic vulnerability of shell tanks.

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References

1. Bakalis, K., Vamvatsikos, D., Fragiadakis, M. (2015) Seismic Fragility Assessment of Steel Liquid Storage Tanks. Proceedings of the ASME 2015 Pressure Vessels and Piping Conference. Volume 8: Seismic Engineering. Boston, Massachusetts, USA. July 19–23. V008T08A023. ASME. https://doi.org/10.1115/PVP2015-45370.
2. Castellano, M.G., Infanti, S., Dumoulin, C., Ducoup, L., Martelli, A., Dusi, A. (2000) Shaking table tests on a liquefied natural gas storage tank mockup seismically protected with elastomeric isolators and steel hysteretic torsional dampers. Proceedings of the 12th World Conference on Earthquake Engineering, [Paper 2082].
3.  Kim, N.S., Lee, D.G. (1995) Pseudodynamic test for evaluation of seismic performance of base-isolated liquid storage tanks. Engineering Structures, 17(3), 198-208.
4. Malhotra, P.K. (1997) New method for seismic isolation of liquid-storage tanks. Earthquake Engineering and Structural Dynamics, 26, 839-47.
5.  Shrimali, M.K., Jangid, R.S. (2002) Seismic response of liquid storage tanks isolated by sliding bearings. Engineering Structures, 24, 909-21.
6. Wang, Y.P., Teng, M.C., Chung, K.W. () Seismic isolation of rigid cylindrical tanks using friction pendulum bearings. Earthquake Engineering and Structural Dynamics, 30, 1083-99.
7. Jadhav, M.B., Jangid, R.S. (2006) Response of base isolated liquid storage tanks to near-fault motions. Structural Engineering and Mechanics, 23(6), 615-34.
8. Shrimali, M.K., Jangid, R.S. (2004) Seismic analysis of base-isolated liquid storage tanks. Journal of Sound and Vibration, 275(1–2), 59-75.
9. Almazan, J.L., Cerda, F.A., De la Llera, J.C., Lopez-Garcia, D. (2007) Linear isolation of stainless steel legged thin-walled tanks. Engineering Structures, 29, 1596-611.
10. Forde, W.R.B. and Stiemer, S.F. (1987) Improved Arc Length Orthogonality Methods for Nonlinear Finite Element Analysis. Computers & Structures, 27(5), 625-630.
11. Veletsos, A.S., Tang, Y. and Tang, H.T. (1992) Dynamic Response of Flexibly Supported Liquid-Storage Tanks. Journal of Structural Engineering, 118, 264-283.
Journal of Seismology and Earthquake Engineering
Volume 23, Issue 1
January 2021
Pages 65-73

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