Vertical Isolation of Seismic Loads in Aboveground Liquid Storage Tanks

Document Type : Structural Earthquake Engineering

Authors

1 PhD candidate of IIEES

2 Associate Professor, International Institute of Earthquake Engineering & Seismology (IIEES)

Abstract

This paper introduces an improved isolation system for aboveground storage tanks (ASTs). In this system, the tank shell is supported by a ring of vertical isolation systems (VIS) that dampen the rocking motion of the tank shell caused by dynamic loads. On the other hand, the forces in the vertical direction caused by the overturning moment are isolated as an alternative to the common horizontal system used for shear base isolation of ASTs. The effects of the proposed vertical isolation system on the seismic responses of the contained liquid are examined using various tank dimensions and earthquake ground motions. The finite element model (taking into account fluid-structure interaction effects) is used to simulate the contained liquid, as well as the tank shell. The results indicate that the new system could efficiently reduce the main seismic design parameters of the tanks, including base shear, overturning moment, and seismic stress in the tank shell. The sloshing wave height, however, is not significantly affected.

Keywords

References

  1. Chalhoub M.S. and Kelly J. (1990). “Shake table test of cylindrical water tanks in base isolated structures”, Journal of Engineering Mechanics, 11, 6(7), 1451–72.
  2. Kim NS. and Lee DG. (1995). “Pseudodynamic test for evaluation of seismic performance of base-isolated liquid storage tanks”, Engineering Structures, 17,198–208.
  3. Park J.H., Koh H.M. and Kim J.K. (2000). “Seismic isolation of pool-type tanks for the storage of nuclear spend fuel assemblies”. Nuclear Engineering and Design,199,143–54.
  4. Wang YP., Teng MC. and Chung KW. (2001). “Seismic isolation of rigid cylindrical tanks using friction pendulum bearings.” Earthquake Engineering and Structural Dynamics, 30(7), 1083–1099
  5. Shrimali M.K. and Jangid, R.S. (2002). “Seismic response of liquid storage tanks isolated by sliding bearings”, Engineering Structures 24 907–919.
  6. Shrimali MK and Jangid RS., (2004). “Seismic analysis of base isolated liquid storage tank”, Journal of Sound and Vibration; 275( 1-2): 59-75.
  7. Cho KH, Kim MK, Lim YM and Cho SY. (2004), “Seismic response of base-isolated liquid storage tanks considering fluid–structure–soil interaction in time domain”. Soil Dynamics and Earthquake Engineering, 24:839–52.
  8. Jadhav MB. and Jangid RS. (2004). “Response of base-isolated liquid storage tanks”. Shock and Vibration, 11 (2004) 33–45.
  9. Shekari MR, Khaji N and Ahmadi M.T.A. (2009). “coupled BE–FE study for evaluation of seismically isolated cylindrical liquid storage tanks considering fluid–structure interaction”. Journal of Fluids and Structures; 25: 567–85.
  10. Abali E and Uçkan A. (2010). “Parametric analysis of liquid storage tanks base isolated by curved surface sliding bearings”. Soil Dynamics and Earthquake Engineering; 30:21–31.
  11. Panchal VR and Jangid RS. (2011). “Seismic Response of Liquid Storage Steel Tanks with Variable Frequency Pendulum Isolator”, KSCE Journal of Civil Engineering; 15(6): 1041-1055.
  12. Soni DP, Mistry BB and Panchal VR. (2011). “Double variable frequency pendulum isolator for seismic isolation of liquid storage tanks”, Nuclear Engineering and Design; 241:700–13.
  13. Zhang R., Weng D. and Ren X. (2011). “Seismic analysis of a LNG storage tank isolated by a multiple friction pendulum system.” Earthquake Engineering and Engineering Vibration, 10(2), 253–262.
  14. Vosoughifar H, and Naderi M. (2014). “Numerical analysis of the base-isolated rectangular storage tanks under bi-directional seismic excitation.” British Journal of Mathematics & Computer Science, 4(21), 3054–3067.
  15. Cheng X., Jing W. and Gong L. (2017). “Simplified Model and Energy Dissipation Characteristics of a Rectangular Liquid-Storage Structure Controlled with Sliding Base Isolation and Displacement-Limiting Devices”, Journal of Performance of Constructed Facilities, 2017, 31(5): -1—1.
  16. American Petroleum Institute API, 1998 “Welded Storage Tanks for Oil Storage”API 650, American Petroleum Institute Standard, Washington D.C.
  17. Goudarzi MA, Sabbagh-Yazdi SR and Marx W. (2010). “Seismic analysis of hydrodynamic sloshing force on storage tank roof”, Earthquake Spectra; 26(1):131-152.

Files

Share

How to cite

Statistics