Using Seismic Isolation Elements to Protect Cylindrical Steel Liquid Storage Tanks from Destructive Forces of Earthquakes

Abstract

This study compares various seismic isolation methods used to reduce the damage caused by impulsive and oscillating impacts on liquid storage tanks during earthquakes. In the research seven models were created, for the reference model no seismic isolation element was used, three models used different rubber bearings of varying hardness as the seismic isolation element and three models used dampers together with rubber bearings of differing hardness. Implementing a system of seismic isolation is very important for both the economy of a country and the environment of countries that are located in zones of high seismic risk. The Nonlinear time history analyses of the models were performed in accordance with the data from the, El Centro (USA), Northridge (USA), and Izmit (Turkey) earthquakes. The way in which the models reacted to the impact of seismic resonance differed according to the elements used. The comparison of the results show that using rubber bearings and dampers can protect the tank systems from the destructive effects of earthquakes.

 

Key words: Cylindrical steel liquid storage tank; Seismic isolation; Dynamic analysis; Time history analysis, Rubber bearings, Dampers.

Keywords

• Cylindrical steel liquid storage tank; Seismic isolation; Dynamic analysis; Time history analysis, Rubber bearings, Dampers.

References

1. Bomhard H., Stempniewski L., “LNG Tanks for seismically highly affected sites. Intl. Post-Smirt Conference Seminar on Isolation”, Energy Dissipation and Control of Vibrations of Structures, Capri, Italy, 115 (1993). [2] Internet: http://sismo.deprem.gov.tr/VERITABANI/hasar.p hp, (2006)
2. Ristic D., “Controlar structural behaviour and passive structural control”. Lectures for The International Post Graduate Studies”, Üsküp, 34-37 (1993).
3. Mestanzade N, Yazıcı G., “Investigation of cylindrical sea tanks with seismic isolation”. Ship Engineering Conference, 187-197 (2004).
4. Rayleigh L., “On the vibrations of a cylindrical vessel containing liquid”. Philosophical Magazine; 15, 385-389 (1883).
5. Nikola E.L., “On the vibrations of a thin-walled cylinder”. Zhurnal Russkogo Fiziko- khimicheskogo Obshchestra 1909, 11-13 (1909).
6. Westergaard H.M., “Water pressure on dams during earthquakes”. Transactions of the ASCE; 98, 418-433 (1933).
7. Hausner G.W., ”Dynamic pressures on accelerated fluid containers”. Bulletin of the Seismological Society of America; 47(1),15-35 (1957).
8. Housner G.W, Haroun M.A., ”Vibration tests of full scale liquid storage tanks”. Proc. and US National Conference on Earthquake Engineering, Stanford, California, 137-145 (1979).

9. Veletsos A.S., ”Seismic response and design of liquid storage tanks. Guidelines for the Design Of Oil and Gas Pipeline System”, ASCE; 255-370 (1984).
10. Chopra A.K., “Earthquake dynamics of base- isolated buildings”, Dynamics of Structures, Prentice-Hall, New York, 731-750 (2002).
11. Karabörk T., “Vibration control systems and high rubber bearing applications”, Unpublished Ph.D. Thesis, Sakarya University, Sakarya (2001).
12. Stanton J., Scroggins G. “Stability of laminated elastomeric bearings”, Journal of Structural Engineering, ASCE, 116, 1351-1371(1990).
13. Malangone P., Ferraioli M.A., “Model procedure for seismic analysis of nonlinear base-isolated multistorey structures”, Earthquake Engineering & Structural Dynamics; 17, 397-412 (1998).
14. Constantinou M.C., Kneifati M.C., “Dynamic of soil-base-isolated-structure systems”, Journal of Structural Engineering, ASCE, 114, 211-221 (1998).
15. Constantinou M.C., “A simplified analysis procedure for base-isolated structures on flexible foundation”, Earthquake Engineering & Structural Dynamics, 15, 963-983 (1987).
16. Dumanoğlu A., Ateş Ş., “Dynamic response analysis of 3D-base isolated asymmetric building structures”, European Association of Earthquake Engineering Task Group 8, Asymmetric and Irregular Structures, İTU, Istanbul, 1, 181-194 (1999).
17. Jangid R., Datta T., “Seismic behaviour of base isolated buildings: a state of art review”, Proceedings Civil Engineers Structures and Buildings, 110, 186-203 (1985).
18. Kelly J.M., “Base isolation: linear theory and design”, Earthquake Spectra, 6(2), 223-244 (1990).
19. Fujino Y., Sun L., Pacheco B.M., “Tuned liquid damper (tld) for suppressing horizontal motion of structures”, Journal of Engineering Mechanics, 118(10), 2017-2030 (1993).
20. Naeim F., Kelly J.M., “Design of seismic isolated structures”. Computer Applications, New York (1999).
21. Hamdan M.N, Abuzeid O., Al-Salaymeh A., “Assessment of an edge type settlement of above ground liquid storage tanks using a simple beam model” , Applied Mathematical Modeling, 31(11), 2461- 2474 (2007).
22. Shekari M.R., Khaji N., Ahmadi M.T., “A coupled BE–FE study for evaluation of seismically isolated cylindrical liquid storage tanks considering fluid–structure interaction”, Journal of Fluids and Structures, 25(3), 567-585 (2009).
23. Maleki A., Ziyaeifar M., “Damping enhancement of seismic isolated cylindrical liquid storage tanks using baffles”, 29(12),3227-3240 (2007).
24. Abalı E., Uçkan E., “Parametric analysis of liquid storage tanks base isolated by curved surface sliding bearings”, Soil Dynamics and Earthquake Engineering, 30(1-2),21-31 (2010).
25. Shekari M.R, Khaji N., Ahmadi M.T.), “On the seismic behavior of cylindrical base-isolated liquid storage tanks excited by long-period ground motions”, Engineering, 30(10), 968-980 (2010.
26. CSI, SAP2000 Analysis, Computers and Structures, Inc. 1-2, Berkeley, California (1997).
27. Wilson E.L., “Three Dimensional Static and Dynamic Analysis of Structures”, Computers and Structures, 25-72 (2001).