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A Static Analysis of Uplift During Strong Earthquakes of Unanchored Flat-Bottom Cylindrical Shell Tanks

[+] Author Affiliations
Teruhiro Nakashima

JIP Techno-Science, Co. Ltd., Yodogawa-ku, Japan

Tomoyo Taniguchi

Tottori University, Koyama-Minami, Japan

Paper No. PVP2016-63928, pp. V008T08A012; 9 pages
  • ASME 2016 Pressure Vessels and Piping Conference
  • Volume 8: Seismic Engineering
  • Vancouver, British Columbia, Canada, July 17–21, 2016
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 978-0-7918-5046-6
  • Copyright © 2016 by ASME


For analyzing the uplift displacement of the tank bottom plate statically and precisely, this paper develops a shell element, ring element and spring element partially attached to the ring element. These elements are defined as a semi-analytical finite element. Moreover in analyzing uplift of the tank bottom plate precisely, the ring element can deal with effects of the large deformation, while the spring element enables to express the partial contact between the tank bottom plate and foundation. Dead load, hydro-pressure and inertia force due to earthquakes acceleration as well as dynamic pressure of fluid induced by bulging and rocking motions of the tank are applied statically. Comparison of results by the proposed method and that computed by the explicit FE Analysis reveals that the accurate uplift displacement is not obtained until all physical conditions involved in the tank rocking motion and the inward deformation of the tank shell is properly considered.

Copyright © 2016 by ASME
Topics: Pipes , Earthquakes



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